CN113533045A - Device and method for measuring volume modulus of soft material - Google Patents
Device and method for measuring volume modulus of soft material Download PDFInfo
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- CN113533045A CN113533045A CN202110780295.9A CN202110780295A CN113533045A CN 113533045 A CN113533045 A CN 113533045A CN 202110780295 A CN202110780295 A CN 202110780295A CN 113533045 A CN113533045 A CN 113533045A
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive 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
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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
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Abstract
The invention discloses a measuring device and a method for the volume modulus of a soft material, wherein the measuring device consists of a horizontal limiting metal cylinder, a vertical limiting base, a punch and a sealing ring; six threaded holes are formed below the horizontal limiting metal cylinder positioned on the upper side; the metal cylinder is connected with a vertical limiting base which is arranged at the lower side and provided with a corresponding number of counter bores through screws; the joint of the two is provided with an annular shallow groove, and the sealing ring is embedded into the groove; the measured sample is arranged at the cavity and is vertically limited by a lower base; the punch is arranged right above the sample and is in smooth contact with the sample; the measuring device disclosed by the invention is simple in structure, low in manufacturing cost, simple, reliable, accurate and effective in measuring method, and can be used for measuring the bulk modulus of various solid materials. Compared with the existing measuring device and method, the invention expands the measuring types, improves the measuring efficiency and the measuring precision and reduces the measuring cost.
Description
Technical Field
The invention relates to the field of solid material bulk modulus testing, in particular to a simple and convenient soft material bulk modulus measuring device and method.
Background
The soft material has wide application in the field of underwater robots in recent years due to the large flexibility, extensibility and plasticity and good sealing property. Particularly, the silicon rubber material in the soft material can be mixed with the pressure-resistant hollow glass beads to form a composite soft material with specific density and different volume moduli by the material structure and the forming mode, and then the composite soft material is applied to an underwater robot and can play the roles of noise reduction and buoyancy compensation. Meanwhile, the soft material is applied to the underwater robot, so that the flexibility of the robot can be increased, and the safety performance such as collision prevention and the environmental adaptability of the robot are further improved.
The existing device for measuring the bulk modulus of the soft material is complex and expensive to manufacture, the existing measurement mode generally adopts an indirect measurement mode of liquid conduction pressure, the measurement precision of the existing measurement mode is determined by the precision of a pressure sensor and a flowmeter, the accuracy is not high, and the types of applicable measurement materials are few, so that the invention of the device which is economical and simple, has high measurement precision and can be widely used for measuring various soft materials is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of complex measuring device, low measuring efficiency and the like in the conventional measuring mode of the bulk modulus of the soft material, and provides the measuring device and the measuring method of the bulk modulus of the soft material, which have the advantages of simple and small structure, high measuring precision and wide applicable material range.
The purpose of the invention is realized by the following technical scheme:
a measuring device for the volume modulus of a soft material comprises a horizontal limiting metal cylinder, a vertical limiting base, a punch and a sealing ring; the horizontal limiting metal cylinder is connected with the vertical limiting base through an inner hexagonal cylinder head screw; a cavity for placing a sample material is arranged in the middle of the horizontal limiting metal cylinder, and the lower part of the sample material is in smooth contact with the vertical limiting base; the punch is positioned right above the sample material and is in smooth contact with the sample material; the sealing ring is embedded in a groove between the horizontal limiting metal cylinder and the vertical limiting base; the shapes of the horizontal limiting metal cylinder and the vertical limiting base are cylindrical; the punch is of a stepped cylindrical structure and is formed by mutually connecting a thick shaft at the upper part and a thin shaft at the lower part.
Furthermore, the horizontal limiting metal cylinder is made of 45 steel, the ratio of the outer diameter to the inner diameter of the horizontal limiting metal cylinder is greater than or equal to 6, and the verticality tolerance between the lower end face of the horizontal limiting metal cylinder and the cavity is smaller than 0.025mm, so that the inner wall of the horizontal limiting metal cylinder is prevented from being deformed in the compression process.
Furthermore, a cavity of the horizontal limiting metal cylinder is in clearance fit with a thin shaft of the punch, and the roughness of the inner wall surface of the cavity is less than or equal to Ra0.8.
Furthermore, a counter bore is arranged at the bottom of the vertical limiting base, the height of the counter bore is greater than or equal to the height of the head of the inner hexagonal socket head cap screw, and the diameter of the counter bore is greater than or equal to the diameter of the head of the inner hexagonal socket head cap screw; the parallelism tolerance of the upper end face and the lower end face of the vertical limiting base is smaller than 0.05mm, and the uniform stress of the sample material in the compression process is ensured.
Furthermore, the perpendicularity tolerance of the upper end surface of the punch and the thin shaft cylindrical surface is lower than 0.025mm, the parallelism tolerance of the upper end surface of the punch and the lower end surface of the punch is lower than 0.05mm, and the surface roughness of the thin shaft cylindrical surface of the punch is less than or equal to Ra0.8; the height ratio of the thin shaft to the thick shaft of the punch is 2.67, and the diameter ratio is 0.42, so that the eccentric load is not easy to occur during loading in the test process, and the guide distance matched with the cavity is reserved.
Furthermore, the outer diameter of the sealing ring is 15 mm.
The invention also provides a method for measuring the volume modulus of soft materials such as silicon rubber, wherein the sample material is placed in the cavity of the horizontal limiting metal cylinder, the horizontal circumferential displacement and the vertical axial displacement of the sample material are limited by the horizontal limiting metal cylinder and the vertical limiting base respectively, and the displacement change rate during compression is ensured to be the volume change rate. The method comprises the following specific steps:
(a) firstly, uniformly coating lubricating oil on the inner wall surface of a cavity of a metal cylinder, then placing a standard sample material into the middle cavity of the metal cylinder, and pushing the sample material from the upper part until the bottom surface of the sample material is basically flush with the bottom surface of the horizontal limiting metal cylinder so as to discharge air in the cavity;
(b) embedding a cleaned O-shaped sealing ring in a groove of the vertical limiting base, aligning the vertical limiting base with the horizontal limiting metal cylinder, and embedding the sealing ring in a groove of the horizontal limiting metal cylinder; screwing inner hexagon screws into the threaded holes respectively, and fixing the vertical limiting base and the horizontal limiting metal cylinder;
(c) placing the fixed measuring device in the center of a bearing table of an electronic universal testing machine, and inserting a fine punch shaft into the cavity to be in smooth contact with a sample material;
(d) opening the electronic universal testing machine, setting a program, and controlling the falling speed of a pressure head of the electronic universal testing machine to be 0.5 mm/min;
(e) adjusting the initial height to ensure that the surface of the electronic universal tester pressure head is tightly attached to the surface of the punch head but does not compress the sample; then, resetting the force and displacement of the testing machine, and starting the testing machine to compress the sample;
(f) under the premise of ensuring that the mechanical property of the sample material cannot be damaged and the loading direction of the punch is not unbalanced, stopping loading when the compression displacement is near 5mm, recording and storing the data of the loading force F and the loading displacement delta l in the loading process, manually operating and lifting the pressure head of the testing machine, taking out the measuring device and taking out the sample material;
(g) repeating steps (a) to (f) with another sample material of the same parameter specification;
(h) deducing the bulk modulus K of the sample materialTest for(ii) a The derivation calculation process is as follows:
volume change of the sample in the compression process:
ΔV＝Δl×A
pressure to which the sample material is subjected:
bulk modulus of the sample material:
wherein A is the cross-sectional area of the sample material, and l is the original length of the sample material when the sample material is not loaded; repeating the step (g) to obtain K of a plurality of sample materials with the same specification parametersTest forThen, averaged to obtain an average value
I.e., the bulk modulus of the sample material being tested.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the measuring device has simple structure, the main body part is a cylindrical piece with regular and simple shape, the processing is easy, the manufacturing cost is low, and the manufacturing period is short. The measuring device is detachable and small in size, and is convenient to carry.
2. The measuring device and the method have wide application range and low requirement on measuring samples, and can be widely applied to the measurement of the bulk modulus of various soft materials. The soft material which is similar to silicon rubber and can be changed from a liquid component into a solid component through injection molding can be directly molded in a cavity of a measuring device so as to ensure higher precision. The measuring method is based on a basic mechanical formula, has a simple measuring principle and is convenient to popularize and apply.
3. The measuring device of the invention has high measuring precision, and is combined with an electronic universal testing machine for application, and the high precision strain gauge of the existing testing machine and the measuring device of the invention determine the high precision of the finally measured bulk modulus for the structural design for ensuring the precision. Compared with the existing measuring method which generally adopts liquid medium indirect compression, the measuring method which directly carries out contact compression on the sample material can observe the actual measurement situation through a computer connected with an electronic universal testing machine in the measuring process, and can more intuitively and obviously obtain the volume change condition of the sample material.
4. The measuring device has high measuring efficiency, the upper part and the lower part which are connected through the socket head cap screws are simply and quickly disassembled, the measuring time depends on the compression speed of the electronic universal testing machine, and the measurement of a single sample can be completed within a few minutes.
5. The measuring device has strong reliability, the strict requirements on the size design, the structural precision and the assembly precision of the horizontal limiting metal cylinder, the vertical limiting base and the punch of the measuring device ensure that the sample material is uniformly stressed and a pressure head is not unbalanced loaded in the test process, the influence of friction on the result is reduced, the accuracy of the measurement result is improved, the interference fit of the O-shaped sealing ring with proper size and the groove ensures that the bottom sample cannot be extruded out of a cavity due to overlarge pressure and the compression strength of the metal cylinder cannot be reduced due to the existence of the groove, the requirement on the ratio of the outer diameter of the metal cylinder to the diameter of the cavity ensures that the hole wall cannot generate errors which obviously influence the measurement result due to overlarge pressure in the test process, and the strength of the measuring device is ensured.
Drawings
FIG. 1 is a schematic view showing the appearance of the apparatus for measuring bulk modulus of soft materials such as silicone rubber;
FIG. 2 is a perspective view of the device for measuring bulk modulus of soft materials such as silicone rubber;
FIG. 3 is an overall sectional view of the measuring device for bulk modulus of soft materials such as silicone rubber of the present invention;
FIG. 4 is a schematic structural view of a horizontal position-limiting metal cylinder according to the present invention;
FIG. 5 is a schematic view of a vertical position-limiting base according to the present invention;
fig. 6 is a schematic view of the punch structure of the present invention.
Reference numerals: 1-a vertical limit base; 2-horizontal limiting metal cylinder; 3-a silicone rubber sample; 4-a punch; 5-a cavity; 6-a threaded hole; 7-sealing the groove; 8-O type sealing ring; 9-base counter bore.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 6, the device for measuring bulk modulus of soft materials such as silicone rubber mainly comprises a vertical limiting base 1, a horizontal limiting metal cylinder 2, a punch 4 and an O-shaped sealing ring 8. The design of the separated device can facilitate the placement and the taking out of the sample, and can also simply and conveniently discharge the air in the cavity. Placing a silicon rubber sample 3 in a cavity 5 in the middle of a horizontal limiting metal cylinder 2, wherein the silicon rubber sample 3 is in smooth contact with a vertical limiting base 1; the punch 4 is positioned right above the sample material and is in smooth contact with the silicon rubber sample 3; the O-shaped sealing ring 8 is embedded in a groove between the metal cylinder and the base. The volume modulus of the silicon rubber sample material can be deduced according to the loading pressure and the loading displacement by combining with a common electronic universal testing machine.
As shown in figure 3, the main body part of the measuring device is a vertical limiting base 1 and a horizontal limiting metal cylinder 2 which are connected through screws, the disassembly and the assembly are simple and convenient, and the silicon rubber sample is inserted from the upper part of a cavity 5 in the middle of the horizontal limiting metal cylinder. The punch 4 and the through hole of the cavity 5 are in clearance fit to reduce friction.
As shown in figure 4, the appearance of the horizontal limiting metal cylinder 2 is cylindrical, the used material is 45 steel, in order to prevent the wall surface of the cavity 5 from being extruded by silicon rubber to generate plastic deformation when the pressure head of the testing machine compresses downwards, the ratio of the diameter of the horizontal limiting metal cylinder 2 to the diameter of the cavity 5 is set to be 7.2, the deformation of the inner wall of the cavity in the compression process is prevented, and the horizontal limiting effect can be ensured to be effectively achieved. The verticality tolerance between the lower end surface and the cavity 5 is less than 0.025mm, and the lower end surface is provided with a sealing groove 7. The bottom of the horizontal limiting metal cylinder 2 is provided with six M8 threaded holes 6 which are uniformly distributed along the circumference, and the horizontal limiting metal cylinder is aligned and tightly connected with the vertical limiting base 1 through six M8 hexagon socket head cap screws.
As shown in fig. 5, the vertical limiting base 1 is cylindrical, the upper end face of the vertical limiting base is provided with a groove which is the same as the sealing groove 7 on the lower end face of the horizontal limiting metal cylinder 2, an O-shaped sealing ring 8 is embedded in the groove, when the vertical limiting base 1 is connected with the horizontal limiting metal cylinder 2, the O-shaped sealing ring 8 embedded into the groove is aligned with the sealing groove 7, and the silicon rubber is prevented from being extruded to the gap between the cylinder and the base contact surface due to overlarge stress when being pressed in a test. The O-shaped sealing ring 8 in the embodiment has the outer diameter of 15mm, and the outer diameter of the O-shaped sealing ring can prevent the bottom of a sample material from being extruded to a gap between a cylinder and a base contact surface when the stress is overlarge, can also ensure the wall surface strength of the bottom of the through hole, and cannot be obviously deformed in the compression process.
The vertical limiting base 1 is provided with six base counter bores 9 which are uniformly distributed along the circumference, the height of each base counter bore 9 cannot be smaller than the height of a head of an inner hexagonal socket head cap screw, and the diameter of each base counter bore cannot be smaller than the head and neck of the inner hexagonal socket head cap screw. The parallelism tolerance between the upper end surface and the lower end surface of the vertical limiting base 1 is lower than 0.05mm, so that the sample material is uniformly stressed in the compression process, and the punch is not in unbalance loading.
As shown in fig. 6, the shape of the punch 4 is a stepped cylinder, the thin shaft cylindrical surface of the punch and the cavity 5 are in clearance fit, the roughness of the surfaces of the thin shaft outer wall of the punch 4 and the inner wall of the cavity 5 cannot exceed ra0.8, and the influence of friction between the punch and the hole wall on a measurement result is reduced. In addition, the verticality tolerance of the upper end surface of the punch and the thin shaft cylindrical surface is lower than 0.025mm, and the parallelism tolerance of the upper end surface of the punch and the lower end surface of the punch is lower than 0.05 mm. The height ratio of the thin shaft to the thick shaft of the punch is 2.67, and the diameter ratio is 0.42, so that the punch is not easy to generate unbalance loading in the test process.
The standard length of the silicon rubber sample in the embodiment is 108mm, and the standard diameter is 12.5 mm; the standard length of the cavity is 118mm, the standard diameter is 12.5mm, the standard diameter of the horizontal limiting metal cylinder is 90mm, and the guide distance of the punch is 10 mm.
The device for measuring the bulk modulus of soft materials such as silicon rubber takes a silicon rubber sample as an example, and the specific bulk modulus measurement is carried out by the following specific steps:
(A) mixing the liquid silica gel component a and the liquid silica gel component b according to the ratio of 1: 1, fully stirring by a glass rod, vacuumizing, exhausting, pouring into the cavity 5 after fully exhausting, and stopping pouring when the liquid level reaches a preset standard line. The mixture is placed in an indoor normal-temperature environment and is kept stand for 10 hours, and then the mixture is taken out. The purpose of uniformly coating the inner wall surface of the thick-wall metal cylinder cavity with lubricating oil is to reduce the friction coefficient between the sample and the inner wall surface, and the purpose of removing air is to avoid compressing air so as to enable the measured bulk modulus to be more accurate.
(B) Lubricating oil is uniformly coated on the inner wall surface of the cavity 5, then the silicon rubber sample molded in the first step is placed in the cavity 5, and the sample material is pushed from the upper part until the bottom surface is basically flush with the horizontal limiting metal cylinder 2, so that the air in the cavity is discharged.
(C) Embedding a cleaned O-shaped sealing ring 8 in a sealing groove of the vertical limiting base 1, aligning the vertical limiting base 1 with the horizontal limiting metal cylinder 2, and embedding the O-shaped sealing ring 8 in a sealing groove 7. Six inner hexagonal socket head cap screws are screwed into the threaded holes 6 from the base counter bores 9 respectively by using an inner hexagonal wrench, and the vertical limiting base 1 and the horizontal limiting metal cylinder 2 are fixed well.
(D) The fixed measuring device was placed in the center of a carrier table of an electronic universal testing machine model DDL100 manufactured by changchun mechanical science research institute, ltd, and a fine shaft of a punch 4 was inserted into the cavity to be in smooth contact with the silicone rubber sample.
(E) And opening the electronic universal testing machine, setting a program and controlling the falling speed of the pressure head of the electronic universal testing machine to be 0.5 mm/min.
(F) And adjusting the initial height to ensure that the surface of the press head of the electronic universal tester is tightly attached to the upper end surface of the punch 4 but does not compress the silicon rubber sample. And then, resetting the force and displacement of the tester, and starting the tester to compress the silicon rubber sample.
(G) Under the premise of ensuring that the mechanical property of the sample material is not damaged and the loading direction of the punch 4 is not unbalanced, the loading is stopped when the compression displacement is near 5mm, and the loading force F in the loading process is recorded and storedLoadingAnd the loading displacement DeltalSiliconAfter data are obtained, the pressure head of the testing machine is lifted up by manual operation, the measuring device is taken out, and the sample material is taken out.
(H) Repeating the steps (A) to (G) to perform a plurality of measurement tests.
Said recorded and saved loading force F of step (G)LoadingAnd the loading displacement DeltalSiliconData from which the bulk modulus K of the sample material can be derivedSilicon. The derivation calculation process is as follows:
volume change of a silicon rubber sample in a compression process:
ΔVsilicon＝ΔlSilicon×A
Pressure to which the silicone rubber sample is subjected:
bulk modulus of silicone rubber:
wherein A is the cross-sectional area of the silicon rubber sample, lSiliconThe original length of the silicone rubber sample when not loaded.
K for obtaining a plurality of silicon rubber samples with the same specification parametersSiliconThen, averaged to obtain an average value
The bulk modulus of the silicon rubber sample is measured.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A measuring device for the volume modulus of a soft material is characterized by comprising a horizontal limiting metal cylinder, a vertical limiting base, a punch and a sealing ring; the horizontal limiting metal cylinder is connected with the vertical limiting base through an inner hexagonal cylinder head screw; a cavity for placing a sample material is arranged in the middle of the horizontal limiting metal cylinder, and the lower part of the sample material is in smooth contact with the vertical limiting base; the punch is positioned right above the sample material and is in smooth contact with the sample material; the sealing ring is embedded in a groove between the horizontal limiting metal cylinder and the vertical limiting base; the shapes of the horizontal limiting metal cylinder and the vertical limiting base are cylindrical; the punch is of a stepped cylindrical structure and is formed by mutually connecting a thick shaft at the upper part and a thin shaft at the lower part.
2. The device for measuring the bulk modulus of a soft body material according to claim 1, wherein the horizontal limiting metal cylinder is made of 45 steel, the ratio of the outer diameter to the inner diameter is greater than or equal to 6, and the verticality tolerance between the lower end surface of the horizontal limiting metal cylinder and the cavity is less than 0.025mm, so as to prevent the inner wall of the horizontal limiting metal cylinder from deforming during the compression process.
3. The device for measuring the bulk modulus of a soft body material as claimed in claim 1, wherein the cavity of the horizontal limiting metal cylinder is in clearance fit with the thin shaft of the punch, and the roughness of the inner wall surface of the cavity is less than or equal to Ra0.8.
4. The device for measuring the bulk modulus of the soft material according to claim 1, wherein a counter bore is arranged at the bottom of the vertical limiting base, the height of the counter bore is greater than or equal to the height of the head of the socket head cap screw, and the diameter of the counter bore is greater than or equal to the diameter of the head neck of the socket head cap screw; the parallelism tolerance of the upper end face and the lower end face of the vertical limiting base is smaller than 0.05mm, and the uniform stress of the sample material in the compression process is ensured.
5. The device for measuring the bulk modulus of the soft material according to claim 1, wherein the perpendicularity tolerance of the upper end surface of the punch and the fine cylindrical surface of the pin is less than 0.025mm, the parallelism tolerance of the upper end surface of the punch and the lower end surface of the punch is less than 0.05mm, and the surface roughness of the fine cylindrical surface of the punch is less than or equal to Ra0.8; the height ratio of the thin shaft to the thick shaft of the punch is 2.67, and the diameter ratio is 0.42, so that the eccentric load is not easy to occur during loading in the test process, and the guide distance matched with the cavity is reserved.
6. The device for measuring bulk modulus of a soft body material as claimed in claim 1, wherein said sealing ring has an outer diameter of 15 mm.
7. A method for measuring the bulk modulus of soft materials such as silicon rubber and the like is based on the device for measuring the bulk modulus of soft materials as claimed in claim 1, and is characterized in that a sample material is placed in a cavity of a horizontal limiting metal cylinder, the horizontal circumferential displacement and the vertical axial displacement of the sample material are limited through the horizontal limiting metal cylinder and a vertical limiting base respectively, and the displacement change rate during compression is ensured to be the volume change rate.
8. The method for measuring bulk modulus of soft material such as silicone rubber as claimed in claim 7, wherein the loading speed of the test machine indenter on the upper end face of the punch during the compression process is not more than 0.5 mm/min.
9. The method for measuring the bulk modulus of soft materials such as silicone rubber and the like according to claim 7 is characterized by comprising the following specific steps:
(a) firstly, uniformly coating lubricating oil on the inner wall surface of a cavity of a metal cylinder, then placing a standard sample material into the middle cavity of the metal cylinder, and pushing the sample material from the upper part until the bottom surface of the sample material is basically flush with the bottom surface of the horizontal limiting metal cylinder so as to discharge air in the cavity;
(b) embedding a cleaned O-shaped sealing ring in a groove of the vertical limiting base, aligning the vertical limiting base with the horizontal limiting metal cylinder, and embedding the sealing ring in a groove of the horizontal limiting metal cylinder; screwing inner hexagon screws into the threaded holes respectively, and fixing the vertical limiting base and the horizontal limiting metal cylinder;
(c) placing the fixed measuring device in the center of a bearing table of an electronic universal testing machine, and inserting a fine punch shaft into the cavity to be in smooth contact with a sample material;
(d) opening the electronic universal testing machine, setting a program, and controlling the falling speed of a pressure head of the electronic universal testing machine to be 0.5 mm/min;
(e) adjusting the initial height to ensure that the surface of the electronic universal tester pressure head is tightly attached to the surface of the punch head but does not compress the sample; then, resetting the force and displacement of the testing machine, and starting the testing machine to compress the sample;
(f) under the premise of ensuring that the mechanical property of the sample material cannot be damaged and the loading direction of the punch is not unbalanced, stopping loading when the compression displacement is near 5mm, recording and storing the data of the loading force F and the loading displacement delta l in the loading process, manually operating and lifting the pressure head of the testing machine, taking out the measuring device and taking out the sample material;
(g) repeating steps (a) to (f) with another sample material of the same parameter specification;
(h) deducing the bulk modulus K of the sample materialTest for(ii) a The derivation calculation process is as follows:
volume change of the sample in the compression process:
ΔV＝Δl×A
pressure to which the sample material is subjected:
bulk modulus of the sample material:
wherein A is the cross-sectional area of the sample material, and l is the original length of the sample material when the sample material is not loaded; repeating the step (g) to obtain K of a plurality of sample materials with the same specification parametersTest forThen, averaged to obtain an average value
I.e., the bulk modulus of the sample material being tested.
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| CN111929168A (en) * | 2020-07-30 | 2020-11-13 | 上海交通大学 | Device and method for measuring volume compressibility of high-molecular hyperelastic material |
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2021
- 2021-07-09 CN CN202110780295.9A patent/CN113533045A/en active Pending
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| JP2008111723A (en) * | 2006-10-30 | 2008-05-15 | Kurosaki Harima Corp | Compression testing method, compression testing machine, and program |
| CN104181191A (en) * | 2014-01-23 | 2014-12-03 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Expanded rubber volume elastic modulus testing and sample preparation apparatus, and method thereof |
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Application publication date: 20211022 |
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