CN117705574A - Compressive strain testing tool for composite material laminated plate - Google Patents
Compressive strain testing tool for composite material laminated plate Download PDFInfo
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- CN117705574A CN117705574A CN202311644468.XA CN202311644468A CN117705574A CN 117705574 A CN117705574 A CN 117705574A CN 202311644468 A CN202311644468 A CN 202311644468A CN 117705574 A CN117705574 A CN 117705574A
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- 238000012360 testing method Methods 0.000 title claims abstract description 89
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 238000007906 compression Methods 0.000 claims abstract description 29
- 230000006835 compression Effects 0.000 claims abstract description 27
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000012669 compression test Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003733 fiber-reinforced composite Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011160 polymer matrix composite Substances 0.000 description 1
- 229920013657 polymer matrix composite Polymers 0.000 description 1
- 239000011208 reinforced composite material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
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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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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the technical field of composite material performance detection, in particular to a composite material laminated plate compressive strain testing tool. The device comprises a double-upright compression fixture and a strain testing device matched with the double-upright compression fixture for clamping and positioning a sample, wherein the strain testing device is used for testing the strain of the sample; the double-upright column compression fixture comprises an upper clamping block, guide posts, an upper clamping plate, a lower clamping block and a lower clamping plate, wherein the upper clamping block is connected with the lower clamping block through the two guide posts, and the upper clamping plate and the lower clamping plate are respectively connected with the corresponding upper clamping block and the lower clamping block and are used for fixing the upper end and the lower end of a sample; the strain testing device comprises an extensometer arm, a first extensometer sensor, a second extensometer sensor and a clamping wire; two ends of the clamping wire are respectively arranged on the two extensometer sensors and used for pulling the two extensometer arms which are oppositely arranged so as to clamp the sample. The compressive strain testing tool for the composite laminated plate aims at solving the problem of low strain testing efficiency in the existing test.
Description
Technical Field
The invention relates to the technical field of composite material performance detection, in particular to a composite material laminated plate compressive strain testing tool.
Background
The compression performance is a hard-to-measure item in the mechanical property test of the fiber reinforced composite material. Compared with other mechanical property tests, the compression test has more factors and more complex operation.
In compression testing of composite materials for aviation, in particular carbon fiber reinforced composite materials, ASTM D6641, standard test method for determining compression characteristics of polymer matrix composite laminates with Combined Load Compression (CLC) fixed test equipment, test method is the composite material compression test standard with highest frequency of use in mixed loading, and a test fixture tool is recommended in the test standard and widely used. The fixture adopts a double-column form, and the samples are firmly clamped at the center of the fixture by adopting 8 tightening screws under the torque of 2.5-3 N.m through four clamping blocks, namely an upper clamping block, a lower clamping block, a left clamping block and a right clamping block, and two ends of the samples are kept flush with two end faces of the fixture in the installation process. The mechanical testing machine applies compression load to one end of the clamp through the pressure disc, so that the shearing force of the side face and the compression force of the end are transmitted to the sample, and the working section of the center of the sample is broken. In the test, the deformation of the sample in the compression process is also required to be monitored, the real-time deformation state of the sample is monitored by calculating the bending percentage, and the current method is to paste two strain gauges on the front and back sides of a working section of the sample before the sample is installed, and the normal temperature and high temperature test and the low temperature test are required to be respectively carried out by selecting adhesives suitable for different environments for pasting the strain gauges. The recommended sample sizes are 140mm by 12mm by 2mm and the working segment sizes are 12mm by 2mm.
The ASTM D6641 compression performance test is used as a standard method for compression testing of the composite material with highest current utilization rate, and due to the size of a working section of a test sample and the structural characteristics of the existing clamp form, the test strain can be carried out only by using a mode of sticking a strain gauge, the normal-temperature test is still operable, and more defects are exposed for tests of high-temperature and low-temperature and wet-state samples, and the method mainly comprises the following problems:
1. the existing mature normal-temperature curing adhesive can only be used below 120 ℃, part of the adhesive can be widened to 150 ℃ in a short time, but the adhesive can only be obtained through import and is high in price, for the adhesive with a one-year shelf life, the import time is longer than 2 months, the waiting time is longer, and the price cost, the time cost and the storage cost are high;
2. at present, the existing high-temperature curing adhesive suitable for adhering strain gauges can be used below 500 ℃, but the curing process is complicated, the temperature needs to be increased by two times and is reduced along with furnace cooling, the whole high-temperature curing period of the adhesive exceeds 8 hours, the performance of the adhesive is possibly reduced due to the influence of high temperature on a temperature-sensitive resin-based composite material, and the high-temperature curing adhesive is not suitable for adhering wet samples and can lead to dehydration and drying of the wet samples; compared with a test period which is only carried out for 10 minutes, the curing process for 8 hours has the advantages that the efficiency is greatly reduced, the requirement of high-efficiency test of production enterprises cannot be met, and the time cost and the labor cost are high;
3. the working section (12 mm multiplied by 12 mm) of the sample is completely shielded by two upright posts of the clamp in the existing clamp structure form, and the strain test cannot be performed by using the contact extensometer which is popular, simple and convenient to operate and reusable at present.
Accordingly, the inventors provide a composite laminate compressive strain testing tool.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the invention provides a compressive strain testing tool for a composite material laminated plate, which solves the technical problem of low strain testing efficiency in the existing test.
(2) Technical proposal
The invention provides a compressive strain testing tool for a composite material laminated plate, which comprises a double-upright-column compressive clamp and a strain testing device matched with the double-upright-column compressive clamp for clamping and positioning a sample, wherein the strain testing device is used for testing the strain of the sample; wherein,
the double-upright column compression fixture comprises an upper clamping block, a guide column, an upper clamping plate, a lower clamping block and a lower clamping plate, wherein the upper clamping block is connected with the lower clamping block through two guide columns, and the upper clamping plate and the lower clamping plate are respectively connected with the corresponding upper clamping block and lower clamping block and are used for fixing the upper end and the lower end of the sample;
the strain testing device comprises an extensometer arm, a first extensometer sensor, a second extensometer sensor and a clamping wire, wherein the first extensometer sensor and the second extensometer sensor are respectively positioned at one end of the corresponding extensometer arm and used for outputting data with a mechanical testing machine, and the other end of each extensometer arm is in surface contact with the working section of the sample; the two ends of the clamping wire are respectively arranged on the two extensometer sensors and used for pulling the two extensometer arms which are oppositely arranged so as to clamp the sample.
Further, the double-upright column compression fixture further comprises bolts, and the upper clamping plate and the lower clamping plate are connected with the upper clamping block and the lower clamping block through corresponding bolts respectively.
Further, the double-upright compression fixture further comprises a linear motion bearing, and the guide post is mounted on the upper clamping block through the linear motion bearing.
Further, a positioning hole is formed in the upper clamping block, and the linear motion bearing is embedded into the positioning hole.
Further, the strain testing device further comprises a protrusion, the protrusion is arranged on the second extensometer sensor, and one end of the clamping wire is connected to the protrusion.
Further, the clamping wire comprises a mounting plate, an elastic element and a high-temperature-resistant flexible wire, two ends of the elastic element are respectively connected with the corresponding mounting plate and the high-temperature-resistant flexible wire, the two mounting plates are respectively mounted on the first extensometer sensor, and one end of the high-temperature-resistant flexible wire is wound on the protrusion.
Further, the mounting plate is sequentially provided with clamping holes at intervals along the length direction thereof, wherein the clamping holes are used for fixing the end parts of the elastic elements.
Further, the elastic element is a spring.
Further, the number of the clamping wires is two, and the clamping wires are respectively positioned on the upper end face and the lower end face of the first extensometer sensor.
Further, the upper clamping block and the lower clamping block are provided with mounting grooves for mounting the sample.
(3) Advantageous effects
In summary, the invention adopts the double-column mode, and under the premise of keeping the sample mixed loading mode and stability, the positions of the columns are adjusted, so that the front and back planes of the sample are completely exposed, and enough space is provided for installing the extensometer to perform strain testing, thereby removing the complex link of attaching the strain gauge, being reusable, the test efficiency is high, the test is just in time, the temperature application range is wide, different types of strain gauges and adhesives are not required to be selected for the test at different temperatures, and the strain testing can achieve the same test effect as the strain gauge method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is an elevation view of a compressive strain testing tool for a composite laminate provided by an embodiment of the invention;
FIG. 2 is a front view of a compressive strain testing tool for a composite laminate provided by an embodiment of the invention;
fig. 3 is a schematic structural view of a dual-column compression fixture according to an embodiment of the present invention;
FIG. 4 is a front view of a strain testing device according to an embodiment of the present invention;
FIG. 5 is a top view of a strain testing device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a wire clip in a strain testing device according to an embodiment of the present invention.
In the figure:
1-a double-upright column compression fixture; 101-upper clamping blocks; 1011—locating holes; 102-a guide post; 103-upper clamping plate; 104-lower clamping blocks; 105-lower splint; 106-a bolt; 107-linear motion bearings; 2-a strain testing device; 201-extensometer arm; 2021-first extensometer sensor; 2022-second extensometer sensor; 203-clamping wires; 2031-a mounting plate; 2032-springs; 2033-a high temperature resistant cord; 204-bump.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, substitutions and improvements in parts, components and connections without departing from the spirit of the invention.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the product of the present invention is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed" and "mounted" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a compressive strain testing tool for a composite material laminated board according to an embodiment of the present invention, as shown in fig. 1 to 4, the testing tool may include a dual-column compressive fixture 1 and a strain testing device 2 used in cooperation with the dual-column compressive fixture, where the dual-column compressive fixture 1 is used for clamping and positioning a sample 100, and the strain testing device 2 is used for testing strain of the sample 100. The double-column compression clamp 1 comprises an upper clamping block 101, guide posts 102, an upper clamping plate 103, a lower clamping block 104 and a lower clamping plate 105, wherein the upper clamping block 101 is connected with the lower clamping block 104 through the two guide posts 102, and the upper clamping plate 103 and the lower clamping plate 105 are respectively connected with the corresponding upper clamping block 101 and the lower clamping block 104 and are used for fixing the upper end and the lower end of a sample 100. The strain testing device 2 comprises an extensometer arm 201, a first extensometer sensor 2021, a second extensometer sensor 2022 and a clamping wire 203, wherein the first extensometer sensor 2021 and the second extensometer sensor 2022 are respectively positioned at one end of the corresponding extensometer arm 201 and used for outputting data with a mechanical testing machine, and the other end of each extensometer arm 201 is in surface contact with the working section of the sample 100; two ends of the clamp wire 203 are respectively mounted on two extensometer sensors 202 and used for pulling two extensometer arms 201 oppositely arranged to clamp the sample 100.
In the above embodiment, the guide posts 102 are used as supporting bodies and ensure the verticality of the fixture, and are embedded in the lower clamping block 104, and when the test sample is strained, the distance between the two guide posts 102 in the lower clamping block 104 should be no less than 15mm, so as to leave a sufficient space for installing the extensometer. As shown in fig. 2, one end of a guide post 102 is fixed with a lower clamp block 104 during the installation of a sample 100, the sample 100 is placed between the lower clamp block 104 and a lower clamp plate 105, four bolts 106 in the lower clamp block 104 are diagonally screwed down by hand, the lower end of the sample 100 is fixed, the upper clamp block 101 and the upper clamp plate 103 are turned upside down, the fastened lower clamp block 104, the lower clamp plate 105, the guide post 102 and the sample 100 are turned upside down together, the upper end of the guide post 102 is embedded into a positioning hole 1011 of the upper clamp block 101 through a linear motion bearing 107, the four bolts 106 in the upper clamp block 101 are screwed down by hand, the upper clamp plate 108 is only fixed at the upper end of the sample, and according to the ASTM D6641 method requirement, the torque is uniformly increased 3 times to 2.5-3 n·m by using a torque screwdriver to screw down eight bolts 106, and the installation of the sample 100 is completed.
The strain testing device consists of two extensometer sensors, four extensometer arms 201 and two wires 203. The extensometer arm 201 is connected with a corresponding extensometer sensor, strain information of the sample 100 is transmitted to the extensometer sensor, and the extensometer sensor transmits the information to mechanical testing machine software through a wire, so that real-time recording of data is achieved. The upper and lower end surfaces of the extensometer sensor are used for fixing the clamping wire 203, and in the test process, the extensometer arm 201 is contacted with the working section of the sample 100 and connects and positions the two extensometer sensors through the clamping wire 203. Therefore, the strain data of the two extensometer sensors can be used for realizing average strain test, and monitoring of sample bending in the test process can be completed according to standard requirements.
As an alternative embodiment, as shown in fig. 4-5, the strain testing device 2 further comprises a protrusion 204, wherein the protrusion 204 is provided on the second extensometer sensor 2022, and one end of the clip 203 is connected to the protrusion 204. Specifically, two protrusions 204 are disposed on the upper and lower end surfaces of the second sensor 2022, and after the clip wire 203 is sequentially wound around the two protrusions 204, two ends of the clip wire are respectively elastically connected with the first sensor 2021. In this regard, the elastic connection between the clip 203 and the first extensometer sensor 2021 or the second extensometer sensor 2022 is not limited, and may be selected according to practical situations, and if the clip is elastically connected to the second sensor 2022, two protrusions 204 may be provided on both the upper and lower end surfaces of the first sensor 2021.
As an alternative embodiment, as shown in fig. 6, the clip 203 includes a mounting plate 2031, an elastic element 2032, and a high-temperature-resistant cord 2033, two ends of the two elastic elements 2032 are respectively connected to the corresponding mounting plate 2031 and the high-temperature-resistant cord 2033, the two mounting plates 2031 are both mounted on the first extensometer sensor 2021, and one end of the high-temperature-resistant cord 2033 is wound around the protrusion 204.
Specifically, after the high temperature-resistant flexible wire 2033 is wound around the protrusion 204, the mounting plates 2031 at the two ends of the clip wire 203 are fixed on the extensometer sensor at the other side, at this time, the elastic element 2032 is stretched to generate a tensile force, one end of each of the four extensometer arms is tightly contacted with the sample 100, after the extensometer is properly aligned, the compression fixture is placed on the pressure plate of the mechanical testing machine together with the extensometer, the deformation of the sample 100 is recorded by the extensometer and transmitted to the testing machine for data calculation by the compression load of the testing machine, the strain of the sample is calculated by the average strain of the two extensometers, the bending percentage of the sample is calculated by the strain output value of each extensometer to monitor the state of the sample in the compression process, the condition that the strength data deviate from the true value due to the occurrence of bending moment in the loading process is avoided, and the fixture is disassembled after the continuous loading until the sample is broken.
As an alternative embodiment, as shown in fig. 5 to 6, the mounting plate 2031 is provided with clip holes for fixing the ends of the elastic element 2032 at intervals in the longitudinal direction thereof. Wherein, the opening of the clamping hole is convenient for adjusting the elastic quantity of the elastic element 2032 (generally, a spring) according to the actual test requirement.
As an alternative embodiment, as shown in fig. 4, two clip lines 203 are provided and are respectively located on the upper and lower end surfaces of the first extensometer sensor 2021. Specifically, two ends of the two clip wires 203 are respectively connected to the first extensometer sensor 2021 and the second extensometer sensor 2022, and the two clip wires 203 are located on the upper end face and the lower end face of the sensor.
As an alternative embodiment, as shown in fig. 3, the upper clamping block 101 and the lower clamping block 104 are provided with mounting grooves for mounting the test sample 100. The provision of the mounting slots can facilitate rapid positioning and mounting of the test specimen 100.
It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. The invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known method techniques is omitted here for the sake of brevity.
The foregoing is merely an example of the present application and is not limited to the present application. Various modifications and alterations of this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. The composite material laminated plate compressive strain testing tool is characterized by comprising a double-upright-column compression clamp (1) and a strain testing device (2) matched with the double-upright-column compression clamp for use, wherein the double-upright-column compression clamp (1) is used for clamping and positioning a sample (100), and the strain testing device (2) is used for testing the strain of the sample (100); wherein,
the double-upright column compression clamp (1) comprises an upper clamping block (101), guide posts (102), an upper clamping plate (103), a lower clamping block (104) and a lower clamping plate (105), wherein the upper clamping block (101) is connected with the lower clamping block (104) through the two guide posts (102), and the upper clamping plate (103) and the lower clamping plate (105) are respectively connected with the corresponding upper clamping block (101) and the corresponding lower clamping block (104) and are used for fixing the upper end and the lower end of the sample (100);
the strain testing device (2) comprises an extensometer arm (201), a first extensometer sensor (2021), a second extensometer sensor (2022) and a clamping wire (203), wherein the first extensometer sensor (2021) and the second extensometer sensor (2022) are respectively positioned at one end of the corresponding extensometer arm (201) and are used for outputting data with a mechanical testing machine, and the other end of each extensometer arm (201) is in surface contact with a working section of the sample (100); two ends of the clamping wire (203) are respectively arranged on the two extensometer sensors and used for pulling the two extensometer arms (201) which are oppositely arranged so as to clamp the sample (100).
2. The composite material laminated plate compression strain testing tool according to claim 1, wherein the double-column compression fixture (1) further comprises bolts (106), and the upper clamping plate (103) and the lower clamping plate (105) are respectively connected with the upper clamping block (101) and the lower clamping block (104) through corresponding bolts (106).
3. The composite material laminated plate compressive strain testing fixture according to claim 1, wherein the double-upright compression fixture (1) further comprises a linear motion bearing (107), and the guide post (102) is mounted on the upper clamping block (101) through the linear motion bearing (107).
4. A composite material laminated plate compressive strain testing fixture according to claim 3, wherein the upper clamping block (101) is provided with a positioning hole (1011), and the linear motion bearing (107) is embedded into the positioning hole (1011).
5. The composite laminate compressive strain testing tool according to claim 1, wherein the strain testing device (2) further comprises a protrusion (204), the protrusion (204) is provided on the second extensometer sensor (2022), and one end of the clip wire (203) is connected to the protrusion (204).
6. The composite laminated board compressive strain testing tool according to claim 5, wherein the clamping line (203) comprises a mounting plate (2031), an elastic element (2032) and a high-temperature-resistant flexible wire (2033), two ends of the two elastic elements (2032) are respectively connected with the corresponding mounting plate (2031) and the high-temperature-resistant flexible wire (2033), the two mounting plates (2031) are both mounted on the first extensometer sensor (2021), and one end of the high-temperature-resistant flexible wire (2033) is wound on the protrusion (204).
7. The composite material laminated plate compressive strain testing tool according to claim 6, wherein the mounting plates (2031) are sequentially provided with clamping holes at intervals along the length direction thereof for fixing the ends of the elastic elements (2032).
8. The composite laminate compressive strain testing tool of claim 6, wherein the elastic element (2032) is a spring.
9. The composite material laminated plate compression strain testing tool according to claim 1, wherein the number of clamping wires (203) is two, and the clamping wires are respectively positioned on the upper end face and the lower end face of the first extensometer sensor (2021).
10. The composite laminated plate compressive strain testing fixture according to claim 1, wherein the upper clamping block (101) and the lower clamping block (104) are provided with mounting grooves for mounting the test sample (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311644468.XA CN117705574A (en) | 2023-12-04 | 2023-12-04 | Compressive strain testing tool for composite material laminated plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311644468.XA CN117705574A (en) | 2023-12-04 | 2023-12-04 | Compressive strain testing tool for composite material laminated plate |
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| Publication Number | Publication Date |
|---|---|
| CN117705574A true CN117705574A (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311644468.XA Pending CN117705574A (en) | 2023-12-04 | 2023-12-04 | Compressive strain testing tool for composite material laminated plate |
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| Country | Link |
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| CN (1) | CN117705574A (en) |
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- 2023-12-04 CN CN202311644468.XA patent/CN117705574A/en active Pending
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