CN110749516B - Soft film fatigue tester device - Google Patents
Soft film fatigue tester device Download PDFInfo
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- CN110749516B CN110749516B CN201910954883.2A CN201910954883A CN110749516B CN 110749516 B CN110749516 B CN 110749516B CN 201910954883 A CN201910954883 A CN 201910954883A CN 110749516 B CN110749516 B CN 110749516B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention discloses a soft film fatigue testing machine device which comprises a clamping module, a loading module, a transmission module and a monitoring module. Wherein the clamping module is used for clamping the peripheral part of the soft film; the loading module is positioned on one side of the soft film clamped by the clamping module; the transmission module is connected with the loading module to drive the loading module to apply periodic out-of-plane load on the soft thin film on the clamping module so as to enable the soft thin film to do periodic reciprocating vibration along the normal direction of the soft thin film; the monitoring module is used for monitoring one or more of an out-of-plane loading state, a deformation state and a fatigue state of the soft membrane. The invention can carry out fatigue test on the soft material film bearing the reciprocating out-of-plane load, and has the advantages of small volume, simple structure, independent module, flexible disassembly and assembly, low cost and convenient popularization and application.
Description
Technical Field
The invention relates to the technical field of soft film fatigue tests, in particular to a soft film fatigue tester device.
Background
In the production life of people, many materials such as workpieces and even structures bear alternating loads, such as gears, rolling bearings and the like. These materials tend to fail under cyclic loads well below the material strength limit. The fatigue failure of the material has gradual change and concealment, thereby causing great threat to the production and life safety of people. With the maturity of industrial technology and the development of scientific research, people develop some methods for inhibiting material fatigue, shot blasting process; for commonly used workpieces, some fatigue test data is accumulated. However, the above-mentioned advances in fatigue are still mainly directed to hard materials.
With the development of material technology and bionic science, soft materials are receiving more and more extensive attention. Many researches have proved that the soft material has very wide application prospect in the aspects of metamaterial and bionic science due to the special physical property different from that of the hard material. The research on the problems associated with fatigue failure of soft materials has not been reported until recently. Different from the fatigue test of hard materials, the fatigue test of soft materials is usually very small in load but large in deformation; therefore, the existing fatigue test equipment suitable for hard materials is not suitable for soft materials.
In addition, many parenchyma tissues (such as blood vessels, heart valves and the like) and biological materials related to the blood circulation system of the human body are subjected to alternating loads (such as blood pressure, blood flow impact force and the like) at any moment; moreover, the direction of action of these loads tends to be out of plane with the parenchyma; in addition, one or both sides of the membrane are in a liquid environment. At present, a testing machine for highly simulating the fatigue test of the soft film from various angles such as a loading mode, a bionic environment and the like is not mature.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a soft material film which can carry out fatigue test on a reciprocating out-of-plane load, has small volume, simple structure, independent modules, flexible disassembly and assembly and low cost, and is convenient to popularize and apply.
The soft film fatigue tester device comprises
A clamping module for clamping a peripheral portion of the flexible film;
the loading module is positioned on one side of the soft film clamped by the clamping module;
the transmission module is connected with the loading module to drive the loading module to apply periodic out-of-plane load on the soft film on the clamping module so as to enable the soft film to do periodic reciprocating vibration along the normal direction of the soft film;
a monitoring module to monitor one or more of an out-of-plane loading state, a deformation state, and a fatigue state of the soft membrane.
According to the soft film fatigue testing machine device provided by the embodiment of the invention, when the soft film is subjected to a fatigue test, the peripheral part of the soft film is clamped by using the clamping module, the loading module is driven by using the transmission module to perform reciprocating periodic motion with a certain amplitude and a certain frequency, the loading module is directly contacted with one side surface of the soft film, so that the soft film is subjected to periodic out-of-plane loading action, the soft film is subjected to periodic reciprocating vibration along the normal direction of the soft film, and meanwhile, one or more of the out-of-plane loading state, the deformation state and the fatigue state of the soft film is monitored by using the monitoring module 4. Therefore, the soft film fatigue testing machine device provided by the embodiment of the invention can be used for carrying out fatigue testing on the soft material film bearing the reciprocating out-of-plane load, and is small in size, simple in structure, independent in module, flexible in disassembly and assembly, low in cost and convenient to popularize and apply.
According to some embodiments of the invention, the clamping module comprises a first clamping end and a second clamping end; the first clamping end comprises a first clamping ring and a plurality of first installation parts, and the first installation parts are fixed on the outer peripheral surface of the first clamping ring at intervals along the circumferential direction of the first clamping ring; the second clamping end comprises a second clamping ring and a plurality of second installation parts, and the second installation parts are fixed on the outer peripheral surface of the second clamping ring at intervals along the circumferential direction of the second clamping ring; the first clamping ring and the second clamping ring are coaxially and oppositely arranged to clamp the peripheral portion of the soft film, and the first installation portions are matched with the second installation portions in a one-to-one correspondence mode and are fastened through a plurality of fasteners respectively.
According to a further embodiment of the invention, the end of the first clamping ring in contact with the soft film and the end of the second clamping ring in contact with the soft film are both polished parts or rubber rings.
According to a further embodiment of the present invention, the end of the first holding ring in contact with the soft film and the end of the second holding ring in contact with the soft film are both flat surfaces, or the end of the first holding ring in contact with the soft film and the end of the second holding ring in contact with the soft film are both occlusal surfaces.
According to a further embodiment of the present invention, the plurality of first mounting portions are provided with first mounting holes, the plurality of second mounting portions are provided with second mounting holes, the plurality of first mounting portions correspond to the plurality of second mounting portions one to one, the plurality of first mounting holes correspond to the plurality of second mounting holes one to one, and the plurality of fasteners penetrate through the plurality of corresponding first mounting holes and second mounting holes one to fasten the first clamping ring and the second clamping ring.
According to a further embodiment of the present invention, the first clamping end further includes a plurality of first plates, the plurality of first plates are fixed on the outer circumferential surface of the first clamping ring at intervals along the circumferential direction of the first clamping ring, and each of the plurality of first plates is provided with a limiting hole; the second clamping end further comprises a plurality of limiting pins, the limiting pins are distributed at intervals along the circumferential direction of the second clamping ring and are fixed on the outer circumferential surface of the second clamping ring through supporting pieces, and the limiting holes are matched with the limiting pins in a one-to-one correspondence manner;
or the first clamping end also comprises a plurality of limiting columns which are distributed at intervals along the circumferential direction of the first clamping ring and are fixed on the peripheral surface of the first clamping ring through a first connecting piece; the second clamping end further comprises a plurality of ring columns, one ends of the plurality of ring columns are fixed to the outer peripheral surface of the second clamping ring through second connecting pieces, a limiting groove is defined by the plurality of ring columns, the plurality of limiting columns are matched in the limiting groove in a one-to-one correspondence mode, and the first connecting pieces penetrate through notches of the limiting groove.
According to some embodiments of the invention, the loading module comprises a third mounting part and a loading head fixed on the third mounting part, the third mounting part is fixed on the transmission module, and the surface of the loading head is a smooth surface.
According to some embodiments of the invention, the monitoring module monitors the out-of-plane loading condition of the soft membrane by: a force sensor is arranged between the transmission module and the loading module, so that the out-of-plane load state of the soft film is directly monitored in real time through the force sensor; and/or indirectly obtaining the out-of-plane loading state of the soft membrane by using the motor current in the transmission module.
According to some embodiments of the invention, the monitoring module monitors the deformation state of the soft membrane by: a laser displacement sensor is arranged on the other side of the soft film and opposite to the loading module, so that the deformation state of the soft film is directly monitored through the laser displacement sensor; and/or indirectly obtaining the deformation state of the soft film by utilizing the motor displacement in the transmission module.
According to some embodiments of the invention, the monitoring module monitors the fatigue state of the soft membrane by: arranging a CCD camera on the other side of the soft film to take pictures at regular time through the CCD camera to monitor whether the soft film generates fatigue damage; or/and monitoring the fatigue state of the soft membrane by monitoring the out-of-plane loading experienced by the soft membrane.
According to some embodiments of the present invention, the monitoring device further comprises a terminal control device, and the terminal control device is respectively connected to the motors of the monitoring module and the transmission module through a collection card.
According to some embodiments of the invention, the apparatus further comprises an open container or a closed container for providing a simulated environment for the soft membrane to perform fatigue tests.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a soft film fatigue tester apparatus according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a loading module of a soft film fatigue tester apparatus according to an embodiment of the invention.
FIG. 3 is a schematic diagram of a clamping module of the apparatus for testing soft film fatigue according to the embodiment of the present invention.
FIG. 4 is a schematic view of another clamping module of the apparatus for testing soft film fatigue according to the embodiment of the present invention.
Reference numerals:
soft film fatigue testing machine device 1000
Clamping module 1
First clamping end 11 first clamping ring 111 first mounting portion 112 first mounting hole 1121
The first plate 113 has a hole 1131 for limiting the position of the first connecting member 115 of the column 114
Second clamping end 12 second clamping ring 121 second mounting portion 122 second mounting hole
Second connecting piece 125 of limiting groove 1241 of limiting pin 12 and ring post 124 of support 123
Loading module 2 third mounting part 21 loading head 22
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A soft film fatigue tester apparatus 1000 according to an embodiment of the present invention is described below with reference to fig. 1 to 4.
As shown in fig. 1 to 4, a soft film fatigue testing apparatus 1000 according to an embodiment of the present invention includes a clamping module 1, a loading module 2, a transmission module 3, and a monitoring module 4. The clamping module 1 is used for clamping the peripheral part of the soft film; the loading module 2 is positioned at one side of the soft film clamped by the clamping module 1; the transmission module 3 is connected with the loading module 2 to drive the loading module 2 to apply periodic external loads on the soft film on the clamping module 1 so as to enable the soft film to do periodic reciprocating vibration along the direction of the soft film; the monitoring module 4 is used to monitor one or more of the out-of-plane loading condition, deformation condition and fatigue condition of the soft membrane.
Specifically, the clamp module 1 is used for clamping the peripheral portion of the soft thin film, ensuring that the portion of the soft thin film within the peripheral portion can directly bear out-of-plane load for performing the fatigue test, preventing the soft thin film from loosening during the fatigue test, and facilitating the smooth performance of the fatigue test.
The loading module 2 is located at one side of the soft membrane clamped by the clamping module 1, whereby the loading module 2 may be directly in contact with one side of the soft membrane from one side of the soft membrane to apply an out-of-plane load to the soft membrane.
The transmission module 3 is connected with the loading module 2 to drive the loading module 2 to apply periodic out-of-plane load to the soft film on the clamping module 1, so that the soft film performs periodic reciprocating vibration along the normal direction of the soft film. That is to say, the loading module 2 is fixed on the transmission module 3, and in the fatigue test process, the transmission module 3 controls the loading module 2 to carry out reciprocating periodic motion with a certain amplitude and a certain frequency, and as the loading module 2 is in direct contact with one surface of the soft thin film, the soft thin film is subjected to periodic out-of-plane loading, so that the soft thin film is subjected to periodic reciprocating vibration along the normal direction of the soft thin film.
The monitoring module 4 is used to monitor one or more of the out-of-plane loading condition, deformation condition and fatigue condition of the soft membrane. That is, in the soft membrane fatigue test process, the monitoring module 4 may monitor the out-of-plane load state, the deformation state, or the fatigue state of the soft membrane, or the monitoring module 4 may monitor the out-of-plane load state and the deformation state of the soft membrane, or the monitoring module 4 may monitor the out-of-plane load state and the fatigue state of the soft membrane, or the monitoring module 4 may monitor the deformation state and the fatigue state of the soft membrane, or the monitoring module 4 may monitor the out-of-plane load state, the deformation state, and the fatigue state of the soft membrane.
According to the soft film fatigue testing machine device 1000 of the embodiment of the invention, when the soft film is subjected to a fatigue test, the clamping module 1 is used for clamping the peripheral part of the soft film, the transmission module 3 is used for driving the loading module 2 to perform reciprocating periodic motion with a certain amplitude and a certain frequency, the loading module 2 is in direct contact with one surface of the soft film, so that the soft film is subjected to periodic out-of-plane loading action, the soft film is subjected to periodic reciprocating vibration along the normal direction of the soft film, and meanwhile, one or more of the out-of-plane loading state, the deformation state and the fatigue state of the soft film are monitored by the monitoring module 4. Therefore, the soft film fatigue testing machine device 1000 provided by the embodiment of the invention can be used for carrying out fatigue testing on a soft material film bearing reciprocating out-of-plane load, and is small in size, simple in structure, independent in module, flexible in disassembly and assembly, low in cost and convenient to popularize and apply.
As shown in fig. 3, according to some embodiments of the invention, the clamping module 1 comprises a first clamping end 11 and a second clamping end 12; the first clamping end 11 includes a first clamping ring 111 and a plurality of first mounting portions 112, the plurality of first mounting portions 112 are fixed on the outer circumferential surface of the first clamping ring 111 at intervals along the circumferential direction of the first clamping ring 111; the second clamping end 12 includes a second clamping ring 121 and a plurality of second mounting portions 122, the plurality of second mounting portions 122 being fixed on the outer circumferential surface of the second clamping ring 121 at intervals in the circumferential direction of the second clamping ring 121; first grip ring 111 and second grip ring 121 coaxial relative setting are with the peripheral part of centre gripping mantle, and a plurality of first installations 112 one-to-ones ground cooperate with a plurality of second installations 122 and fasten through a plurality of fasteners respectively to can press from both sides the mantle of the fatigue test that awaits measuring, and be favorable to loading module 2 can be from the one side of mantle direct with the face contact of mantle so as to exert the off-plane load to the mantle. In addition, the clamping module 1 is simple in structure.
According to a further embodiment of the present invention, the end of the first clamping ring 111 contacting the soft film and the end of the second clamping ring 121 contacting the soft film are both polished portions or are uniformly adhered with rubber rings, so as to reduce the damage of the first clamping ring 111 and the second clamping ring 121 to the soft film.
According to a further embodiment of the present invention, both the end of the first clamping ring 111 contacting the soft film and the end of the second clamping ring 121 contacting the soft film are flat surfaces, so that the peripheral portion of the soft film can be clamped well by the mutual cooperation of the flat surface of the end of the first clamping ring 111 contacting the soft film and the flat surface of the end of the second clamping ring 121 contacting the soft film; or the end part of the first clamping ring 111 contacting with the soft film and the end part of the second clamping ring 121 contacting with the soft film are both occlusal surfaces, so that the peripheral part of the soft film can be well clamped by the mutual matching of the occlusal surface of the end part of the first clamping ring 111 contacting with the soft film and the occlusal surface of the end part of the second clamping ring 121 contacting with the soft film.
As shown in fig. 3, according to a further embodiment of the present invention, the plurality of first mounting portions 112 are provided with first mounting holes 1121, the plurality of second mounting portions 122 are provided with second mounting holes (not shown), the plurality of first mounting portions 112 correspond to the plurality of second mounting portions 122 one to one, the plurality of first mounting holes 1121 correspond to the plurality of second mounting holes one to one, and the plurality of fasteners (not shown) penetrate through the plurality of corresponding first mounting holes 1121 and second mounting holes one to fasten the first clamping ring 111 and the second clamping ring 121, so that the peripheral portion of the flexible film can be clamped. The fastening structure is simple and convenient to operate. The fasteners may be bolts or other fasteners.
As shown in fig. 3, according to a further embodiment of the present invention, the first clamping end 11 further includes a plurality of first plates 113, the plurality of first plates 113 are fixed on the outer circumferential surface of the first clamping ring 111 at intervals along the circumferential direction of the first clamping ring 111, and each of the plurality of first plates 113 is provided with a position-limiting hole 1131; the second clamping end 12 further comprises a plurality of limit pins 12, the limit pins 12 are distributed at intervals along the circumferential direction of the second clamping ring 121 and fixed on the outer circumferential surface of the second clamping ring 121 through the supporting member 123, and the limit holes 1131 are in one-to-one corresponding fit with the limit pins 12; therefore, the first clamping end 11 and the second clamping end 12 can be conveniently and quickly matched in a positioning mode, and the installation is more convenient. Alternatively, as shown in fig. 4, the first clamping end 11 further includes a plurality of position-limiting columns 114, the plurality of position-limiting columns 114 are distributed at intervals along the circumferential direction of the first clamping ring 111 and fixed on the outer circumferential surface of the first clamping ring 111 through the first connecting member 115; the second clamping end 12 further includes a plurality of ring posts 124, one end of each of the plurality of ring posts 124 is fixed on the outer peripheral surface of the second clamping ring 121 through a second connecting member 125, each of the plurality of ring posts 124 defines a limiting groove 1241, the plurality of limiting posts 114 are fitted in the limiting grooves 1241 in a one-to-one correspondence manner, and the first connecting member 115 passes through the notch of the limiting groove 1241; therefore, the first clamping end 11 and the second clamping end 12 can be conveniently and quickly matched in a positioning mode, and the installation is more convenient.
It should be noted that the clamping module 1 is made of a hard material, and may be a water-resistant, acid-resistant, alkali-resistant, and corrosion-resistant metal (such as stainless steel) or an engineering plastic. In addition, the specific shape of the clamping module 1 should be matched with the size and shape of the soft film sample, and the circular ring shape is not the choice of displacement.
As shown in fig. 1, according to some embodiments of the present invention, the transmission module 3 includes a motor (not shown in the drawings), a crank 32, a connecting rod 33, a slide rail 34, and a slider 35; wherein, the motor is connected with the central shaft of the crank 32 to drive the crank 32 to do circular motion; one end of the connecting rod 33 is pivotally connected to the crank 32, the other end of the connecting rod is pivotally connected to the sliding block 35, and the loading module 2 is fixed on the sliding block 35; the slide rail 34 is provided in the radial direction of the crank 32, and the slider 35 is provided on the slide rail 34. When the motor drives the crank 32 to rotate circumferentially, one end of the connecting rod 33 also moves circumferentially along with the crank 32, and the other end drives the sliding block 35 to move in a reciprocating periodic manner along the sliding rail 34, so that the loading module 2 is driven to move in a reciprocating periodic manner, and the soft film is subjected to periodic out-of-plane loading action due to the fact that the loading module 2 is in direct contact with one surface of the soft film, so that the soft film is subjected to periodic reciprocating vibration along the normal direction of the soft film. The transmission structure is simple.
Optionally, the motor may rotate according to a set loading frequency, and the set loading frequency may be 0.5 to 1000 Hz.
Of course, in other embodiments, the specific structure of the transmission module 3 may also adopt other structural forms as long as the loading module 2 can be controlled to perform reciprocating periodic motion with a certain amplitude and a certain frequency.
As shown in fig. 2, according to some embodiments of the present invention, the loading module 2 includes a third mounting portion 21 and a loading head 22 fixed to the third mounting portion 21, the third mounting portion 21 is fixed to the transmission module 3, and the surface of the loading head 22 is smooth, so that the wear of the soft film can be prevented. Optionally, the loading head 22 may be spherical, ellipsoidal, or otherwise shaped. The individual parts of the loading module 2 can be obtained by metal machining or 3D printing.
According to some embodiments of the invention, the monitoring module 4 monitors the out-of-plane load condition of the soft membrane by: a force sensor 41 (shown in fig. 1) is arranged between the transmission module 3 and the loading module 2, so that the out-of-plane load state of the soft film can be directly monitored in real time through the force sensor 41; the method for monitoring the out-of-plane load state of the soft film by using the force sensor 41 has the advantages of direct monitoring, simple structure and accurate and reliable measurement; in addition, for the soft film fatigue test, half of the external load of the soft film surface is small, so the range of the force sensor 41 is only about 1N to 100N, and the resolution is not lower than 0.1N. Or/and the monitoring module 4 monitors the out-of-plane loading state of the soft membrane by the following modes: the out-of-plane load state of the soft film is indirectly obtained by utilizing the motor current in the transmission module 3; specifically, when the transmission module 3 and the loading module 2 are completely determined, the motor current and the motor attached torque borne by the motor of the transmission module 3 correspond to the motor current one by one, after the motor current and the load borne by the loading module 2 are calibrated, the current signal of the motor can be recorded by the acquisition card and converted into the load borne by the soft thin film, and therefore the monitoring of the out-of-plane load state of the loading module 2 acting on the soft thin film is achieved.
According to some embodiments of the invention, the monitoring module 4 monitors the deformation state of the soft membrane by: a laser displacement sensor 42 (shown in fig. 1) is arranged on the other side of the soft film and opposite to the loading module 2, so that the deformation state of the soft film is directly monitored through the laser displacement sensor 42; it can be understood that the deformation state of the soft film can be monitored in a gas phase or liquid phase environment by using the laser displacement sensor 42, and the measurement is accurate and reliable; to ensure that the laser displacement sensor 42 is not attacked by the liquid environment, a transparent protective cover may be used to protect the laser displacement sensor 42. Or/and the monitoring module 4 monitors the deformation state of the soft film by the following modes: the deformation state of the soft film is indirectly obtained by utilizing the displacement of a motor in the transmission module 3; in this way, in particular, when the dimensions of the transmission module 3 and the loading module 2 are completely determined, the displacement stroke of the loading module 2 is completely determined, and since the loading module 2 is in direct contact with one side of the soft film, the displacement stroke of the loading module 2 can be regarded as the displacement of the loading point of the soft film, so as to determine the deformation condition of the soft film.
According to some embodiments of the invention, the monitoring module 4 monitors the fatigue state of the soft membrane by: a CCD camera 43 (shown in FIG. 1) is arranged on the other side of the soft film to take pictures at regular time by the CCD camera 43 to monitor whether the soft film is fatigue-damaged; it is understood that the CCD camera 43 may be used in a gas phase or liquid phase environment, and when the CCD camera 43 is used in a liquid phase environment, the CCD camera 43 needs to be waterproofed, for example, by using a transparent cover to protect the CCD camera 43. Or/and the monitoring module 4 monitors the fatigue state of the soft film by the following modes: monitoring the fatigue state of the soft film by monitoring the out-of-plane load borne by the soft film; it is understood that when the soft membrane fails in fatigue, the soft membrane is subjected to a reduced load; when the soft film is subjected to fatigue failure, the load bearing capacity of the soft film is close to zero. Thus, by analyzing the out-of-plane loading state of the soft membrane, the fatigue state of the soft membrane can be monitored.
As shown in fig. 1, according to some embodiments of the present invention, the monitoring device further includes a terminal control device 5, and the terminal control device 5 is connected to the motors of the monitoring module 4 and the transmission module 3 respectively through a collection card. Specifically, the terminal control device 5 may be a computer for controlling the start, stop and rotation speed of the motor of the transmission module 3; the control terminal is matched with the acquisition card to acquire the motor current and the data of the monitoring module 4 and store the data in a specified data file format, so that the operation and monitoring of a tester can be facilitated by arranging the terminal control device 5.
As shown in fig. 1, according to some embodiments of the present invention, an open container 6 or a closed container is further included, and the open container 6 or the closed container is used for providing a simulated environment for a soft film to perform a fatigue test. Therefore, the gas-phase or liquid-phase working environment of the soft film in actual working is set in the open container 6 or the closed container to serve as a simulation environment, the soft film is placed in the corresponding simulation environment to perform fatigue testing, and the reliability of the testing is improved. For example, if the actual condition of the flexible membrane is a liquid condition (designated as liquid a), then sufficient liquid a is injected into the open container 6 until the liquid a submerges the flexible membrane and the loading head 22 of the loading module 2 to ensure that the flexible membrane is in the environment of liquid a throughout the test. The open container 6 is mainly made of a material capable of preventing the liquid a from corroding, such as stainless steel or engineering plastic.
The soft film fatigue tester apparatus 1000 according to the present invention will be described with reference to a specific example.
In this embodiment, as shown in fig. 1, the soft film fatigue tester apparatus 1000 includes a holding module 1, a loading module 2, a transmission module 3, a monitoring module 4, a terminal control device 5, and an open container 6. The clamping module 1 is used for clamping the peripheral part of the soft film; the loading module 2 is positioned at one side of the soft film clamped by the clamping module 1; the transmission module 3 is connected with the loading module 2 to drive the loading module 2 to apply periodic external loads on the soft film on the clamping module 1 so as to enable the soft film to do periodic reciprocating vibration along the direction of the soft film; the monitoring module 4 is used for monitoring one or more of the out-of-plane loading state, the deformation state and the fatigue state of the soft film; the terminal control device 5 is respectively connected with the motors of the monitoring module 4 and the transmission module 3 through acquisition cards; the open container 6 is used to provide a simulated environment for the soft film to perform fatigue testing.
This embodiment has the following advantages: when carrying out fatigue test to the soft film, use the peripheral part of the tight soft film of centre gripping module 1 clamp, and in the simulated environment of uncovered container 6, utilize transmission module 3 drive loading module 2 to carry out the reciprocal periodic motion of certain frequency of certain range, because loading module 2 and soft film's one side direct contact, make the soft film receive periodic off-plate load effect, thereby make the soft film do periodic reciprocating vibration along the normal direction of soft film, and simultaneously, utilize monitoring module 4 monitoring soft film's off-plate load state, one or more in deformation state and the fatigue state, through terminal control device 5 control test operation and control. Therefore, the soft membrane fatigue testing machine device 1000 of the embodiment can perform fatigue testing on the soft material membrane bearing the reciprocating out-of-plane load in a simulation environment, and has the advantages of small volume, simple structure, independent functional modules, flexible disassembly and assembly, and freely replaceable and adjustable loading modules 2, thereby reducing the requirements on the soft membrane sample, and the soft membrane fatigue testing machine device 1000 of the embodiment has low cost and is convenient to popularize and apply.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A soft film fatigue tester device is characterized by comprising
A clamping module for clamping a peripheral portion of the flexible film;
the loading module is positioned on one side of the soft film clamped by the clamping module;
the transmission module is connected with the loading module to drive the loading module to apply periodic out-of-plane load on the soft film on the clamping module so as to enable the soft film to do periodic reciprocating vibration along the normal direction of the soft film;
a monitoring module for monitoring one or more of an out-of-plane loading state, a deformation state, and a fatigue state of the soft membrane;
the clamping module comprises a first clamping end and a second clamping end; the first clamping end comprises a first clamping ring and a plurality of first installation parts, and the first installation parts are fixed on the outer peripheral surface of the first clamping ring at intervals along the circumferential direction of the first clamping ring; the second clamping end comprises a second clamping ring and a plurality of second installation parts, and the second installation parts are fixed on the outer peripheral surface of the second clamping ring at intervals along the circumferential direction of the second clamping ring; the first clamping ring and the second clamping ring are coaxially and oppositely arranged to clamp the peripheral part of the soft film, and the plurality of first installation parts are matched with the plurality of second installation parts in a one-to-one correspondence manner and are respectively fastened through a plurality of fasteners;
the end part of the first clamping ring in contact with the soft film and the end part of the second clamping ring in contact with the soft film are both polished parts or rubber rings;
the first clamping end further comprises a plurality of first plates, the first plates are fixed on the outer peripheral surface of the first clamping ring at intervals along the circumferential direction of the first clamping ring, and limiting holes are formed in the first plates; the second clamping end further comprises a plurality of limiting pins, the limiting pins are distributed at intervals along the circumferential direction of the second clamping ring and are fixed on the outer circumferential surface of the second clamping ring through supporting pieces, and the limiting holes are matched with the limiting pins in a one-to-one correspondence manner;
or the first clamping end also comprises a plurality of limiting columns which are distributed at intervals along the circumferential direction of the first clamping ring and are fixed on the peripheral surface of the first clamping ring through a first connecting piece; the second clamping end further comprises a plurality of ring columns, one ends of the plurality of ring columns are fixed to the outer peripheral surface of the second clamping ring through second connecting pieces, a limiting groove is defined by the plurality of ring columns, the plurality of limiting columns are matched in the limiting groove in a one-to-one correspondence mode, and the first connecting pieces penetrate through notches of the limiting groove.
2. The soft film fatigue tester device of claim 1, wherein the end of the first clamping ring in contact with the soft film and the end of the second clamping ring in contact with the soft film are both flat surfaces, or the end of the first clamping ring in contact with the soft film and the end of the second clamping ring in contact with the soft film are both occlusal surfaces.
3. The soft film fatigue tester device of claim 1, wherein a plurality of the first mounting portions are provided with first mounting holes, a plurality of the second mounting portions are provided with second mounting holes, the plurality of first mounting portions and the plurality of second mounting portions are in one-to-one correspondence, the plurality of first mounting holes and the plurality of second mounting holes are in one-to-one correspondence, and a plurality of the fasteners pass through the plurality of corresponding first mounting holes and the plurality of corresponding second mounting holes in one-to-one correspondence to fasten the first clamping ring and the second clamping ring.
4. The soft film fatigue tester device of claim 1, wherein the loading module comprises a third mounting portion and a loading head fixed on the third mounting portion, the third mounting portion is fixed on the transmission module, and the surface of the loading head is a smooth surface.
5. The soft membrane fatigue tester device of claim 1, wherein the monitoring module monitors the out-of-plane loading condition of the soft membrane by: a force sensor is arranged between the transmission module and the loading module, so that the out-of-plane load state of the soft film is directly monitored in real time through the force sensor; and/or indirectly obtaining the out-of-plane loading state of the soft membrane by using the motor current in the transmission module.
6. The soft membrane fatigue tester device of claim 1, wherein the monitoring module monitors the deformation state of the soft membrane by: a laser displacement sensor is arranged on the other side of the soft film and opposite to the loading module, so that the deformation state of the soft film is directly monitored through the laser displacement sensor; and/or indirectly obtaining the deformation state of the soft film by utilizing the motor displacement in the transmission module.
7. The soft membrane fatigue tester device of claim 1, wherein the monitoring module monitors the fatigue state of the soft membrane by: arranging a CCD camera on the other side of the soft film to take pictures at regular time through the CCD camera to monitor whether the soft film generates fatigue damage; or/and monitoring the fatigue state of the soft membrane by monitoring the out-of-plane loading experienced by the soft membrane.
8. The soft film fatigue tester device of claim 1, further comprising a terminal control device, wherein the terminal control device is connected to the motors of the monitoring module and the transmission module respectively through a collection card.
9. The soft membrane fatigue tester device of claim 1, further comprising an open container or a closed container for providing a simulated environment for the soft membrane to perform a fatigue test.
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| JPS6432147A (en) * | 1987-07-16 | 1989-02-02 | Schenck Ag Carl | Test piece clamper for material tester |
| US6526813B1 (en) * | 2000-09-25 | 2003-03-04 | Leica Microsystems Inc. | Metallurgical sample magazine |
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