CN111289371A - Composite material shell external pressure resistance structure response measuring device and method - Google Patents
Composite material shell external pressure resistance structure response measuring device and method Download PDFInfo
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- CN111289371A CN111289371A CN202010023877.8A CN202010023877A CN111289371A CN 111289371 A CN111289371 A CN 111289371A CN 202010023877 A CN202010023877 A CN 202010023877A CN 111289371 A CN111289371 A CN 111289371A
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- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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Abstract
The invention provides a device and a method for measuring the response of an external pressure resistant structure of a composite material shell, wherein the device comprises: the shell is provided with a pressing opening; the cover body is detachably matched with the shell to form a closed inner cavity, the inner side of the cover body is suitable for being connected with the open end of the composite material shell to be detected, a liquid outlet hole is formed in the cover body and is connected with a volume measuring device, and the liquid outlet hole is suitable for communicating the volume measuring device with the inner cavity of the composite material shell to be detected; and the strain gauge is connected with the data acquisition device through a wire and is suitable for being attached to the inner wall of the composite material shell. The device and the method for measuring the external pressure resistance structure response of the composite material shell can simultaneously measure the external pressure resistance strain history and the external pressure resistance volume change of the composite material shell in real time, and can more accurately control the appearance change and the buoyancy of the composite material shell structure according to the measured strain history and volume change data, so that the cruising ability and the submergence depth of the composite material shell in a deep sea task can be improved.
Description
Technical Field
The invention belongs to the technical field of external pressure shell test devices, and particularly relates to a device and a method for measuring response of an external pressure resistant structure of a composite shell.
Background
With the development of deep sea detection requirements, the external pressure resistant shell made of the traditional metal material cannot provide enough buoyancy, and a large amount of endurance power is consumed, so that the composite material external pressure resistant shell with the characteristics of light weight and high strength is more and more concerned. The composite material external pressure shell for carrying out the deep sea task has the advantages that the pressure borne by the composite material external pressure shell can be continuously increased along with the increase of the submergence depth, so that the external pressure test is generally required to be carried out on the external pressure shell for deep sea detection in order to ensure the use safety of the composite material external pressure shell, and the external pressure bearing limit is measured. The conventional bearing detection device of the outer pressure shell adopts incompressible medium-water to test in a closed container, and Chinese patent document CN204128906U discloses a PE pipe external pressure test device, wherein a to-be-tested PE pipe is connected with the end part of an outer PE pipe, so that an accommodating cavity is formed between the to-be-tested PE pipe and the end part of the outer PE pipe, and pressure is applied to the accommodating cavity so as to monitor the stability of the structure of the PE pipe changing along with external pressure.
However, for the composite material outer pressure shell for carrying out deep sea tasks, the structural response changes along with the increase of the submergence depth, not only enough safety factor is required, but also the influence of the structural appearance change on the buoyancy needs to be accurately evaluated, and further the cruising ability of the system and the stable control of the submergence depth are improved, so that the deformation condition of the composite material outer pressure shell along with the increase of the submergence depth needs to be measured. Since the composite outer pressure shell with designability is of an anisotropic structure, the structural response of the composite outer pressure shell is different from that of a conventional metal shell, and the relationship between the external dimension and the pressure cannot be accurately established, experimental determination is needed. The existing detection device can accurately carry out limit bearing test, but cannot accurately measure the volume change, so that a new detection device and a new detection method are needed to realize the accurate measurement of the structural response of the external pressure shell under the external pressure working condition, realize the synchronous test of the bearing capacity and the volume change, improve the detection quality of products and provide support for the structural optimization design.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the response of an external pressure resistant structure of a composite material shell, which can simultaneously measure the bearing capacity and the volume change of the composite material shell along with the change of external pressure.
In order to solve the above problems, the present invention provides a composite material casing external pressure resistance structure response measuring device, comprising:
the shell is suitable for accommodating the composite material shell to be tested, and a pressing opening is formed in the shell;
the cover body is detachably matched with the shell to form a closed inner cavity, the inner side of the cover body is suitable for being connected with the open end of the composite material shell to be detected, a liquid outlet hole is formed in the cover body, a volume measuring device is connected to the liquid outlet hole, and the liquid outlet hole is suitable for communicating the volume measuring device with the inner cavity of the composite material shell to be detected;
and the strain gauge is connected with the data acquisition device through a wire and is suitable for being attached to the inner wall of the shell of the composite material to be detected.
Preferably, the open end of the shell is provided with a first lower flange;
the lid includes:
the first upper flange plate is detachably connected with the first lower flange plate; the through hole of the first upper flange plate is communicated with the inner cavity of the composite material shell to be detected;
the sealing cover is detachably arranged on the through hole, and the liquid outlet hole is arranged on the sealing cover.
Preferably, a second upper flange plate is detachably arranged on the inner side of the cover body, and the second upper flange plate is suitable for being detachably connected with a second lower flange plate at the open end of the composite material shell to be tested.
Preferably, the composite material shell further comprises a sealing head, wherein a third upper flange is arranged on the sealing head, and the third upper flange is suitable for being detachably connected with a third lower flange at the other open end of the composite material shell to be tested.
Preferably, the head is the hemisphere head, and the material of head is strong anti external pressure metal material, and strong anti external pressure metal material can bear pressure and be greater than 600 MPa.
Preferably, the inner side of the first upper flange is provided with an annular flange, and the annular flange is tightly assembled with the inner wall of the shell when the first upper flange is matched with the first lower flange;
and/or the inner side of the second upper flange plate is provided with an annular flange, and the annular flange is tightly assembled with the inner wall of the composite material shell to be tested when the second upper flange plate is matched with the second lower flange plate;
and/or an annular flange is arranged on the inner side of the third upper flange plate, and the annular flange is tightly assembled with the inner wall of the composite material shell to be tested when the third upper flange plate is matched with the third lower flange plate.
Preferably, the outer side of the annular flange is sleeved with an O-shaped gasket.
Preferably, the inner side of the first upper flange or the first lower flange is provided with an annular groove, and a sealing ring is filled in the annular groove;
and/or an annular groove is arranged on the inner side of the second upper flange or the second lower flange, and a sealing ring is filled in the annular groove;
and/or an annular groove is formed in the inner side of the third upper flange or the third lower flange, and a sealing ring is filled in the annular groove.
Preferably, the sealing cover is further provided with a signal wire window, and a lead of the strain gauge is led out from the signal wire window and is connected with a data acquisition device outside the shell.
Another object of the present invention is to provide a method for measuring the response of the composite shell anti-external pressure structure, which is accomplished by using the apparatus for measuring the response of the composite shell anti-external pressure structure claimed in the claims.
Preferably, the method specifically comprises the following steps:
s1, connecting an open end of a composite material shell to be tested with a cover body, and attaching a strain gauge to the inner wall of the composite material shell to be tested;
s2, filling an inner cavity formed by the cover body and the composite material shell to be tested with an incompressible medium;
and S3, applying different pressures to the shell through the pressurizing port, acquiring signals through the strain gauge to obtain the strain condition of the composite material shell to be measured, and measuring the volume of the incompressible medium extruded from the inner cavity through the volume measuring device to obtain the volume change condition of the composite material shell to be measured.
Wherein the incompressible medium may be water or other incompressible liquid.
The inner sides of the first upper flange, the first lower flange, the second upper flange, the second lower flange, the third upper flange and the third lower flange are all the sides opposite to the surfaces of the pair of flanges.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the response measuring device of the external pressure resistant structure of the composite material shell, the cover body of the measuring device is arranged to be connected with one open end of the composite material shell to be measured, the volume measuring device is connected to the liquid outlet hole on the cover body, the strain gauge is attached to the inner wall of the composite material shell to be measured and continuously pressed into the shell of the measuring device, the strain gauge determines the strain condition of the composite material shell to be measured and transmits the strain condition to the data acquisition device, and the volume measuring device determines the liquid extruded by the composite material shell which is deformed under pressure, so that the strain history of the composite material shell and the external pressure resistant volume change condition of the composite material shell can be realized under the condition that the pressure is continuously increased;
2. the composite material shell anti-external pressure structure response measuring device has a further optimized structure, the cover body is provided with a first upper flange connected with the shell and a sealing cover arranged on a through hole of the first upper flange, the composite material shell to be measured is connected with the first upper flange through a second upper flange detachably arranged on the inner side of the first upper flange, the structure can be further improved on the basis of the existing measuring device, the bottom of the first upper flange of the existing measuring device is connected with the second upper flange through a fastening bolt, and the through hole of the first upper flange is detachably connected with the sealing cover through the fastening bolt, so that the measuring device can be obtained, investment is not needed, a new measuring device is manufactured, and the cost is greatly saved;
3. according to the response measuring device of the external pressure resistant structure of the composite material shell, the connecting positions of the device are enabled to have good sealing effect through the connection of the plurality of pairs of flanges and the arrangement of the corresponding sealing structures in the plurality of pairs of flanges, and liquid leakage does not occur in the pressing measuring process, so that the measuring accuracy is higher;
4. the method for measuring the response of the external pressure resisting structure of the composite material shell is realized by using the device for measuring the response of the external pressure resisting structure of the composite material shell, can simultaneously measure the external pressure resisting strain history and the external pressure resisting volume change of the composite material shell in real time through operation, solves the technical problem of volume and strain measurement of the composite material shell under the action of external pressure, can more accurately control the shape change and the buoyancy of the structure of the external pressure shell of the composite material according to the measured data of the strain history and the volume change, and further can improve the cruising ability and the diving depth of the external pressure shell of the composite material in a deep sea task.
Drawings
FIG. 1 is a schematic structural diagram of a composite material casing external pressure resistance structural response measuring device according to an embodiment of the present invention;
fig. 2 is a partial enlarged view of a part a of a composite material shell external pressure resistance structure response measuring device according to an embodiment of the invention.
Wherein: 1-a housing; 11-a first lower flange; 2-a composite material shell to be tested; 21-a second lower flange; 22-a third lower flange; 3-pressing the opening; 4-a cover body; 41-a first upper flange; 42-a through hole; 43-a sealing cover; 44-a second upper flange; 5-liquid outlet holes; 6-volume measuring means; 7-strain gauge; 8-sealing the end; 81-a third upper flange; 9-an annular flange; 10-an annular groove; 12-sealing ring.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the device for measuring the response of the composite material shell external pressure resistance structure in the embodiment includes:
the shell 1 is suitable for accommodating a composite material shell 2 to be tested, and a pressing opening 3 is formed in the shell 1;
the cover body 4 is detachably matched with the shell 1 to form a closed inner cavity, the inner side of the cover body 4 is suitable for being connected with the open end of the composite material shell 2 to be detected, a liquid outlet 5 is formed in the cover body 4, a volume measuring device 6 is connected to the liquid outlet 5, and the liquid outlet is suitable for communicating the volume measuring device 6 with the inner cavity of the composite material shell 2 to be detected;
the strain gauge 7 is connected with the data acquisition device through a wire, and the strain gauge 7 is suitable for being attached to the inner wall of the composite material shell 2.
The working process of the composite material shell external pressure resistance structure response measuring device in the embodiment is as follows: attaching a strain gauge 7 to the inner wall of a composite material shell 2 to be measured, connecting the composite material shell 2 to be measured with a cover body 4, then connecting the cover body 4 with a shell 1 in a matching way, so that the composite material shell 2 to be measured is contained in a closed inner cavity formed by the shell 1 and the cover body 4, filling incompressible liquid into the inner cavity formed by the cover body 4 and the composite material shell 2 to be measured through a liquid outlet 5, connecting a pressurizing port 3 with a pressurizing device, pumping water into the shell 1 through the pressurizing device, continuously increasing pressure, detecting strain data of the composite material shell through the strain gauge 7 in the process, transmitting the strain data to a data acquisition device for recording the strain data, simultaneously, enabling the composite material shell to deform due to the application of external pressure so as to change the volume, and enabling the incompressible liquid in the composite material shell to be extruded to a volume measurement device 6 from the liquid outlet 5 due to the change of the volume, and the volume measuring device measures the volume of the extruded liquid, so that the external pressure resistance volume change condition of the composite material shell is obtained.
The anti external pressure structure of combined material casing response measuring device of embodiment has solved combined material external pressure casing volume and the technical problem of strain measurement under the external pressure effect well, the measurement to external pressure casing structure response has been simplified, can realize the real-time measurement to external pressure casing volume variation in the implementation detection to the external pressure strain history of combined material casing, according to the strain history and the volume variation data that record, can carry out more accurate control to combined material external pressure casing structure appearance change and buoyancy, and then can improve duration and the dive degree of combined material external pressure casing in the deep sea task.
Wherein, the concrete size, shape, wall thickness, the material of shell 1 and lid 4 can design according to the demand of actual external pressure, and the metal material is preferred to the material of shell 1 and lid 4, is difficult for taking place the deformation.
Preferably, the open end of the housing 1 is provided with a first lower flange 11; the lid body 4 includes: the first upper flange 41, the first upper flange 41 is detachably connected with the first lower flange 11; the through hole 42 of the first upper flange 41 is communicated with the inner cavity of the composite material shell 2 to be tested; the sealing cover 43 is detachably arranged on the through hole 42, and the liquid outlet hole 5 is arranged on the sealing cover 43. The shell 1 is connected with the cover body 4 through the first upper flange plate and the first lower flange plate, so that the stability of the connection structure of the shell 1 and the cover body 4 is stronger, the sealing cover 43 and the through hole 42 are matched to facilitate the selective measurement of the performance of the shell, when the external pressure strain history of the shell is required to be measured, the sealing cover 43 can be disassembled, the shell is connected with the composite material shell to be measured only through the first upper flange plate, the strain gauge penetrates into the composite material shell to be measured through the through hole 42 and is attached to the inner wall of the shell, and the sealing cover 43 can be tightly covered, so that the lead of the strain gauge penetrates through the through hole in the sealing cover; when the volume change under the external pressure condition needs to be measured, the sealing cover 43 can be tightly covered, and the shell of the composite material to be measured is filled with incompressible liquid for measurement. And through the design of this structure, measuring device only needs on the basis that current anti external pressure structure of casing responds measuring device, adds the sealed lid that establishes a liquid hole in its opening part of first upper flange dish and can realize measuring when the volume change under external pressure strain history and the external pressure condition, need not to do other structural modification again, also need not to invest again capital and make new measuring device.
Further, the sealing cover 43 and the first upper flange 41 can be detachably connected through the cooperation of the fastening bolts and the screw holes.
Further, the sealing cover 43 may be flat, oval, etc., preferably oval.
Preferably, the inner side of the cover 4 is also detachably provided with a second upper flange 44, and the second upper flange 44 is adapted to be detachably connected with the second lower flange 21 at the open end of the composite material housing 2 to be tested. The cover body is connected with the composite material shell to be tested through the flange, so that the stability of the connection structure of the cover body and the composite material shell to be tested is higher.
Further, the second upper flange 44 is detachably connected to the cover 4 by fastening bolts and screw holes.
Preferably, the testing device further comprises a sealing head 8, wherein a third upper flange 81 is arranged on the sealing head 8, and the third upper flange 81 is suitable for being detachably connected with a third lower flange 22 at the other open end of the composite material shell 2 to be tested.
The shape of the end socket 8 can be selected from a flat plate shape, a hemispherical shape, an oval shape, a butterfly shape and the like, the end socket 8 is preferably a hemispherical end socket, in end sockets with various shapes and structures, the stress effect of end socket products with the hemispherical structure is best, the radial stress and the circumferential stress of spherical products are equal, the stress of a spherical shell is only one half of the circumferential stress of a cylinder, the stress level is low, and the deformation is small. The wall thickness of the sealing head 8 is preferably close to the wall thickness of the composite housing 2 to be tested. The material of the end socket 8 is preferably strong external pressure resistant metal material, and can bear pressure intensity larger than 600 MPa. The structure change of the seal head in the measuring process can be minimized, and the influence of the deformation of the seal head structure on the measuring structure is reduced.
Specifically, the first upper flange and the first lower flange, the second upper flange and the second lower flange, and the third upper flange and the third lower flange are tightly connected through the fit of fastening bolts and nuts. Rubber gaskets can be arranged between the first upper flange and the first lower flange, between the second upper flange and the second lower flange, and between the third upper flange and the third lower flange, so that the connection tightness of the first upper flange and the second lower flange is further improved.
Preferably, the inner side of the first upper flange 41 is provided with an annular flange 9, and the annular flange 9 is tightly assembled with the inner wall of the shell 1 when the first upper flange 41 is matched with the first lower flange 11;
and/or the inner side of the second upper flange plate 44 is provided with an annular flange 9, and when the second upper flange plate 44 is matched with the second lower flange plate 21, the annular flange 9 is tightly assembled with the inner wall of the composite material shell 2 to be detected;
and/or the inner side of the third upper flange plate 81 is provided with an annular flange 9, and when the third upper flange plate 81 is matched with the third lower flange plate 22, the annular flange 9 is tightly assembled with the inner wall of the composite material shell 2 to be tested.
The annular flange 9, the inner wall of the shell 1 and the inner wall of the composite material shell 2 to be tested are tightly assembled, so that the sealing performance of the shell, the cover body and the composite material shell to be tested, the second upper flange and the third upper flange can be further ensured, and liquid leakage during pressing is prevented from influencing the measurement of strain history and volume deformation.
Preferably, the outside of the annular flange 9 is sleeved with an O-ring gasket to further improve the sealing.
Preferably, as shown in fig. 2, an annular groove 10 is provided on the inner side of the first upper flange 41 or the first lower flange 11, and a sealing ring 12 is filled in the annular groove 10;
and/or the inner side of the second upper flange plate 44 or the second lower flange plate 21 is provided with an annular groove 10, and a sealing ring 12 is filled in the annular groove 10;
and/or an annular groove 10 is formed in the inner side of the third upper flange plate 81 or the third lower flange plate 22, and a sealing ring 12 is filled in the annular groove 10.
The sealing ring is arranged in the annular groove, the position of the sealing ring can be further locked, the sealing ring is not easy to shift, and the installation is more convenient and rapid.
Wherein, a plurality of strain gauges 7 can be respectively attached to different positions on the inner wall of the composite material shell to be detected; the strain gauge 7 may specifically be a resistance strain gauge, which belongs to the prior art, and the principle thereof is based on the strain effect, that is, when a conductor or a semiconductor material is mechanically deformed under the action of an external force, the resistance value thereof changes correspondingly. The strain gauge is attached to a position to be measured on the inner wall of the composite material shell 2 to be measured, when the inner wall of the shell is mechanically deformed along with external pressure, the strain gauge is correspondingly changed to cause the change of the resistance value of the strain gauge, and the strain of the composite material shell to be measured is obtained by collecting the change of the resistance value of the strain gauge. The strain gauge adopted in the embodiment is a BF250-2HA strain gauge manufactured by Hualan sea electrometric technology corporation.
Wherein, data acquisition device accessible simple data acquisition circuit realizes, also can adopt current data acquisition instrument to realize, and in this embodiment, data acquisition device adopts guangzhou seemer information technology ltd's UCAM-60B static data acquisition appearance.
The volume measuring device 6 can be an injector cylinder body directly and inversely installed on the liquid outlet hole of the sealing cover, the volume of the extruded liquid is continuously read through scales on the injector cylinder body, the volume measuring device can also be a connecting pipe which is directly connected to the liquid outlet hole and provided with scales, or the connecting pipe is connected to the container, and the balance is used for measuring the mass change of the connecting pipe and the container.
The invention also aims to provide a response measuring method of the composite shell external pressure resisting structure, which is completed by using the response measuring device of the composite shell external pressure resisting structure.
Preferably, the method specifically comprises the following steps:
s1, connecting an open end of a composite material shell 2 to be tested with a cover body 4, and attaching a strain gauge 7 to the inner wall of the composite material shell 2 to be tested;
s2, filling an inner cavity formed by the cover body 4 and the composite material shell 2 to be tested with an incompressible medium;
s3, applying different pressures to the shell 1 through the pressurizing opening 3, acquiring signals through the strain gauge 7 to obtain the strain condition of the composite material shell 2 to be measured, and measuring the volume of the incompressible medium extruded from the inner cavity through the volume measuring device 6 to obtain the volume change condition of the composite material shell 2 to be measured.
Further, the method specifically comprises the following steps:
s1, connecting a second lower flange plate at one open end of a composite material shell 2 to be detected with a second upper flange plate, then connecting the second upper flange plate with the inner side of a first upper flange plate, attaching a strain gauge 7 to different parts of the inner wall of the composite material shell 2 to be detected, connecting a third lower flange plate at the other open end of the composite material shell 2 to be detected with a third upper flange plate of an end enclosure, then connecting the first upper flange plate with a first lower flange plate of a shell 1, and covering a sealing cover on a through hole of the second upper flange plate;
s2, filling water into an inner cavity formed by the composite material shell 2 to be detected, the end socket, the second upper flange plate and the sealing cover from the liquid outlet;
s3, through the pressurizing device, liquid is continuously pumped into the shell 1 from the pressurizing port 3 to enable the liquid pressure inside the shell 1 to be continuously raised, signals are acquired through the strain gauge 7 under different pressures to obtain the strain condition of the composite material shell 2 to be measured, the strain signals are transmitted to the data acquisition device through the conducting wires to record strain history, the volume of water on the basis in the inner cavity is measured through the volume measuring device 6, and the volume change condition of the composite material shell 2 to be measured is obtained.
The composite material shell external pressure resistance structure response measuring device of the embodiment is characterized in that a cover body of the measuring device is arranged to be connected with an open end of a composite material shell to be measured, a volume measuring device is connected to a liquid outlet hole in the cover body, a strain gauge is attached to the inner wall of the composite material shell to be measured and continuously pressed into a shell of the measuring device, the strain gauge determines the strain condition of the composite material shell to be measured and transmits the strain condition to a data acquisition device, and the volume measuring device determines liquid extruded by the composite material shell after the composite material shell is deformed under pressure, so that the strain history of the composite material shell and the external pressure resistance volume change condition of the composite material shell can be realized under the condition that the pressure is continuously increased; the structure further optimized in the embodiment is that the cover body is provided with a first upper flange connected with the shell and a sealing cover arranged on a through hole of the first upper flange, the composite material shell to be measured is connected with the first upper flange through a second upper flange detachably arranged on the inner side of the first upper flange, the structure can be further improved on the basis of the existing measuring device, the measuring device can be obtained only by connecting the bottom of the first upper flange of the existing measuring device with the second upper flange through a fastening bolt and detachably connecting the sealing cover with the through hole of the first upper flange through the fastening bolt, and investment is not needed to be expended for manufacturing a new measuring device, so that the cost is greatly saved; in the structure further optimized by the embodiment, the connecting positions of the device have good sealing effect by connecting the plurality of pairs of flanges and arranging the corresponding sealing structures in the plurality of pairs of flanges, and liquid leakage does not occur in the pressing measurement process, so that the measurement accuracy is higher; the anti external pressure structure response measuring method of combined material casing of this embodiment, use anti external pressure structure response measuring device of combined material casing to realize, accessible operation is simultaneously carried out real-time measurement to the anti external pressure strain history and the anti external pressure volume change volume of combined material casing, the volume of combined material casing under the external pressure effect and the technical problem of strain measurement have been solved, according to the strain history and the volume change volume data that record, can carry out more accurate control to combined material external pressure casing structure appearance change and buoyancy, and then can improve duration and the dive degree of depth of combined material external pressure casing in the deep sea task.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. An external pressure resistant structure response measuring device of a composite shell is characterized by comprising:
the shell is suitable for accommodating the composite material shell to be tested, and a pressing opening is formed in the shell;
the cover body is detachably matched with the shell to form a closed inner cavity, the inner side of the cover body is suitable for being connected with the open end of the composite material shell to be detected, a liquid outlet hole is formed in the cover body, a volume measuring device is connected to the liquid outlet hole, and the liquid outlet hole is suitable for communicating the volume measuring device with the inner cavity of the composite material shell to be detected;
and the strain gauge is suitable for being attached to the inner wall of the composite material shell to be detected, and is connected with the data acquisition device through a wire.
2. The composite shell external pressure resistant structural response measurement device of claim 1, wherein:
the open end of the shell is provided with a first lower flange plate;
the cover body includes:
the first upper flange plate is detachably connected with the first lower flange plate; the through hole of the first upper flange plate is communicated with the inner cavity of the composite material shell to be tested;
the sealing cover is detachably arranged on the through hole, and the liquid outlet hole is arranged on the sealing cover.
3. The composite shell external pressure resistant structural response measurement device of claim 2, wherein:
the inner side of the cover body can be also detachably provided with a second upper flange plate, and the second upper flange plate is suitable for being detachably connected with a second lower flange plate at the open end of the composite material shell to be tested.
4. An external pressure resistant structural response measuring device of a composite shell as set forth in claim 3, wherein:
the composite material shell to be tested is characterized by further comprising a sealing head, wherein a third upper flange plate is arranged on the sealing head and is suitable for being detachably connected with a third lower flange plate on the other opening end of the composite material shell to be tested.
5. The composite shell external pressure resistant structural response measurement device of claim 4, wherein:
the head is the hemisphere head, the material of head is strong anti external pressure metal material, strong anti external pressure metal material can bear pressure and be greater than 600 MPa.
6. An external pressure resistant structural response measuring device of a composite shell as claimed in claim 4 or 5, wherein:
an annular flange is arranged on the inner side of the first upper flange plate, and when the first upper flange plate is matched with the first lower flange plate, the annular flange is tightly assembled with the inner wall of the shell;
and/or an annular flange is arranged on the inner side of the second upper flange plate, and when the second upper flange plate is matched with the second lower flange plate, the annular flange is tightly assembled with the inner wall of the composite material shell to be tested;
and/or an annular flange is arranged on the inner side of the third upper flange plate, and when the third upper flange plate is matched with the third lower flange plate, the annular flange is tightly assembled with the inner wall of the composite material shell to be tested.
7. The composite shell external pressure resistant structural response measurement device of claim 6, wherein: and an O-shaped gasket is sleeved on the outer side of the annular flange.
8. An external pressure resistant structural response measuring device of a composite shell as claimed in claim 4 or 5, wherein:
an annular groove is formed in the inner side of the first upper flange or the first lower flange, and a sealing ring is filled in the annular groove;
and/or an annular groove is arranged on the inner side of the second upper flange or the second lower flange, and a sealing ring is filled in the annular groove;
and/or an annular groove is formed in the inner side of the third upper flange or the third lower flange, and a sealing ring is filled in the annular groove.
9. A method for measuring the response of the external pressure resistant structure of the composite shell, which is characterized by being completed by using the device for measuring the response of the external pressure resistant structure of the composite shell as claimed in any one of claims 1 to 8.
10. The method for measuring the external pressure resistance structure response of the composite shell as recited in claim 9, comprising the following steps:
s1, connecting an open end of the composite material shell to be tested with the cover body, and attaching the strain gauge to the inner wall of the composite material shell to be tested;
s2, filling an inner cavity formed by the cover body and the composite material shell to be tested with an incompressible medium;
and S3, applying different pressures to the shell through the pressurizing opening, acquiring signals through a strain gauge to obtain the strain condition of the to-be-detected composite material shell, and measuring the volume of the incompressible medium extruded from the inner cavity through the volume measuring device to obtain the volume change condition of the to-be-detected composite material shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010023877.8A CN111289371A (en) | 2020-01-09 | 2020-01-09 | Composite material shell external pressure resistance structure response measuring device and method |
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| CN202010023877.8A CN111289371A (en) | 2020-01-09 | 2020-01-09 | Composite material shell external pressure resistance structure response measuring device and method |
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| CN112629761A (en) * | 2021-02-08 | 2021-04-09 | 山西江淮重工有限责任公司 | High-voltage safety testing device and high-voltage safety testing method |
| CN114046766A (en) * | 2021-09-24 | 2022-02-15 | 广东省交通规划设计研究院集团股份有限公司 | Device and method for testing stress-strain based on soil layer in drill hole |
| CN114813378A (en) * | 2022-05-10 | 2022-07-29 | 中国海洋大学 | Intelligent composite shell inspection device and method |
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Application publication date: 20200616 |