CN117213972A - Testing device for Poisson ratio of honeycomb core material under tensile load - Google Patents
Testing device for Poisson ratio of honeycomb core material under tensile load Download PDFInfo
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- CN117213972A CN117213972A CN202311167822.4A CN202311167822A CN117213972A CN 117213972 A CN117213972 A CN 117213972A CN 202311167822 A CN202311167822 A CN 202311167822A CN 117213972 A CN117213972 A CN 117213972A
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Abstract
The application relates to the technical field of honeycomb structure detection, in particular to a device for testing the Poisson ratio of a honeycomb core material under a tensile load. The first end of the force value sensor is connected with the electronic universal testing machine, the electronic universal testing machine is used for applying tensile load to the honeycomb core material sample, the second end of the force value sensor is connected with the universal adapter through the first connecting rod, the universal adapter is connected with the first clamp through the second connecting rod, the second clamp is connected with the base of the electronic universal testing machine through the third connecting rod, and the first clamp and the second clamp are respectively used for clamping the upper end part and the lower end part of the honeycomb core material sample; the transverse scale and the longitudinal scale are respectively arranged on two opposite end surfaces of the honeycomb core material clamping sample. The device for testing the Poisson ratio of the honeycomb core under the tensile load aims to solve the problems that the applied pressure of the Poisson ratio test of the honeycomb core is difficult to determine, has large dispersion and is tedious and time-consuming in the test at present.
Description
Technical Field
The application relates to the technical field of honeycomb structure detection, in particular to a device for testing the Poisson ratio of a honeycomb core material under a tensile load.
Background
Poisson's ratio refers to the ratio of the positive transverse strain to the positive axial strain of a material when the material is in unidirectional tension or compression, also known as the transverse deformation coefficient, which is the elastic constant that reflects the transverse deformation of the material. The poisson ratio test of the honeycomb core material used at present is generally obtained by manually applying a pressing force to the honeycomb core material on a cylindrical barrel tool to measure the elastic curvature radius, and is generally carried out by using ASTM 6790/D6790M-22 Standard test method for poisson ratio of the honeycomb core material, which is explicitly described in the above standards that the test method has not been widely used yet and is still in a conceptual stage. The method adopts a honeycomb core material with the plane size of 300mm multiplied by 300mm, the radius of a corresponding cylinder is about 300mm, a ruler is placed at the midpoint of two edges of the sample, which are not in contact with the cylinder, under the condition that the sample bends around the cylinder, the chord length is measured, the ruler is positioned at the midpoint of the straight edge, the depth is measured, and then the two dimensions are solved according to a certain formula. This method is cumbersome, time consuming, and has a large error. The following problems exist during the above test:
(1) The need to bend the sample around the cylinder ensures that the midpoint of the two parallel ends of the sample is in contact with the cylinder, during which process the contact is difficult to ensure by the lighter manual pressure, which is easily broken by the heavier manual pressure;
(2) The honeycomb core materials with different performances have different suitable cylinder radiuses, the metal cylinder has larger radius, higher processing cost, difficult transportation and poorer operability;
(3) The honeycomb core material is not made of discontinuous materials, the surface is not a smooth and hard plane, when the chord length and depth are measured, the error of the size measurement and the midpoint selection is larger, and the test result is quite discrete;
(4) When poisson ratio is measured by the method, labor cost is consumed, one person is required to press the honeycomb, one person is required to find a measuring point, and one person is required to measure.
Accordingly, the inventors provide a device for testing the poisson's ratio of a honeycomb core under tensile load.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the application provides a device for testing the Poisson ratio of a honeycomb core material under tensile load, which solves the technical problems that the applied pressure in the Poisson ratio test of the conventional honeycomb core material is difficult to determine, has larger discreteness and is tedious and time-consuming in test.
(2) Technical proposal
The application provides a testing device for poisson ratio of a honeycomb core material under tensile load, which comprises a force value sensor, a first connecting rod, a universal adapter, a second connecting rod, a first grating reading head, a second grating reading head, a first clamp, a second clamp, a third connecting rod, a transverse scale, a longitudinal scale, a first grating displacement sensor, a second grating displacement sensor, a third grating displacement sensor, a fourth grating displacement sensor and an electronic universal testing machine, wherein the force value sensor is arranged on the first connecting rod; wherein,
the first end of the force value sensor is connected with the electronic universal testing machine, the electronic universal testing machine is used for applying a tensile load to the honeycomb core material sample, the second end of the force value sensor is connected with the universal adapter through the first connecting rod, the universal adapter is connected with the first clamp through the second connecting rod, the second clamp is connected with the base of the electronic universal testing machine through the third connecting rod, and the first clamp and the second clamp are respectively used for clamping the upper end part and the lower end part of the honeycomb core material sample;
the transverse scale is transversely arranged on one side end face of the clamping honeycomb core material sample, the longitudinal scale is longitudinally arranged on the other opposite side end face of the clamping honeycomb core material sample, the first grating displacement sensor and the second grating displacement sensor are respectively connected with the first grating reading head, and the third grating displacement sensor and the fourth grating displacement sensor are respectively connected with the second grating reading head.
Further, the device further comprises a first fastener and a second fastener, wherein the first clamp is fixed with the clamped honeycomb core sample through the first fasteners which are horizontally arranged, and the second clamp is fixed with the clamped honeycomb core sample through the second fasteners which are horizontally arranged.
Further, each of the first fasteners and the corresponding second fastener are located within the same column of honeycomb cells of the clamped honeycomb core sample.
Further, the first fastener and the second fastener are pins, and the radial dimension of the pins is matched with the honeycomb cell dimension of the clamped honeycomb core material sample.
Further, the first grating reading head comprises a first signal display and a second signal display, and the first signal display and the second signal display are respectively connected with the corresponding first grating displacement sensor and the second grating displacement sensor one by one.
Further, the second grating reading head comprises a third signal display and a fourth signal display, and the third signal display and the fourth signal display are respectively connected with the corresponding third grating displacement sensor and fourth grating displacement sensor one by one.
Further, the device also comprises a first mounting piece and a second mounting piece, wherein the transverse scale and the longitudinal scale are respectively connected with the clamping honeycomb core sample through the corresponding first mounting piece and the second mounting piece.
Further, the transverse scale is located at the longitudinal center of the end face of the clamped honeycomb core sample, and the longitudinal scale is located at the transverse center of the end face of the clamped honeycomb core sample.
Further, the first grating displacement sensor and the second grating displacement sensor are respectively installed at two ends of the transverse scale, and the third grating displacement sensor and the fourth grating displacement sensor are respectively installed at two ends of the longitudinal scale.
Further, the first grating reading head and the second grating reading head are both arranged on the table top of the electronic universal testing machine in a flat mode.
(3) Advantageous effects
In conclusion, the electronic universal testing machine is adopted to apply accurate and visual tensile load, so that the testing can be conveniently and quickly performed, the accurate deformation can be obtained through the high-precision grating ruler displacement sensor, and meanwhile, parameters such as transverse shrinkage, longitudinal elongation, poisson ratio, multi-node tensile strength, elongation at break and the like can be accurately obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, 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 a schematic diagram of a device for testing Poisson's ratio of a honeycomb core under tensile load according to an embodiment of the present application;
FIG. 2 is a front view of a test apparatus for Poisson's ratio of a honeycomb core under tensile load according to an embodiment of the present application;
fig. 3 is a rear view of a device for testing poisson's ratio of a honeycomb core under a tensile load according to an embodiment of the present application.
In the figure:
1-a force value sensor; 2-a first connecting rod; 3-universal adapter; 4-a second link; 5-a first grating reading head; 501-a first signal display; 502-a second signal display; 6-a second grating reading head; 601-a third signal display; 602-a fourth signal display; 7-a first clamp; 8-a second clamp; 9-a third link; 10-transverse scale; 11-longitudinal scale; 12-a first grating displacement sensor; 13-a second grating displacement sensor; 14-a third grating displacement sensor; 15-a fourth grating displacement sensor; 16-a first fastener; 17-a second fastener; 18-a first mount; 19-a second mount; 100-honeycomb core sample.
Detailed Description
Embodiments of the present application 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 application and are not intended to limit the scope of the application, i.e., the application 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 application.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
In the description of the present application, 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 application is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present application 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 application.
In the description of the present application, 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 application will be understood in specific cases by those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of a poisson ratio testing device for a honeycomb core under tensile load, which is provided in an embodiment of the present application, and as shown in fig. 1 to 3, the testing device may include a force value sensor 1, a first link 2, a universal adapter 3, a second link 4, a first grating reading head 5, a second grating reading head 6, a first fixture 7, a second fixture 8, a third link 9, a transverse scale 10, a longitudinal scale 11, a first grating displacement sensor 12, a second grating displacement sensor 13, a third grating displacement sensor 14, a fourth grating displacement sensor 15, and an electronic universal tester; the first end of the force value sensor 1 is connected with an electronic universal testing machine, the electronic universal testing machine is used for applying a tensile load to the honeycomb core material sample 100, the second end of the force value sensor 1 is connected with the universal adapter 3 through the first connecting rod 2, the universal adapter 3 is connected with the first clamp 7 through the second connecting rod 4, the second clamp 8 is connected with the base of the electronic universal testing machine through the third connecting rod 9, and the first clamp 7 and the second clamp 8 are respectively used for clamping the upper end part and the lower end part of the honeycomb core material sample 100; the transverse scale 10 is transversely placed on one side end surface of the clamped honeycomb core material sample 100, the longitudinal scale 11 is longitudinally placed on the other opposite side end surface of the clamped honeycomb core material sample 100, the first grating displacement sensor 12 and the second grating displacement sensor 13 are respectively connected with the first grating reading head 5, and the third grating displacement sensor 14 and the fourth grating displacement sensor 15 are respectively connected with the second grating reading head 6.
In the above embodiment, the universal adapter 3 can flexibly rotate during loading, so that the center line of the sample and the loading force direction are ensured to be on the same straight line, and the loading centering is kept. The first grating reading head 5 comprises a first signal display 501 and a second signal display 502, and the first signal display 501 and the second signal display 502 are respectively connected with the corresponding first grating displacement sensor 12 and second grating displacement sensor 13 one by one; the second grating reading head 6 comprises a third signal display 601 and a fourth signal display 602, and the third signal display 601 and the fourth signal display 602 are respectively connected with the corresponding third grating displacement sensor 14 and fourth grating displacement sensor 15 one by one.
Applying a tensile load to the honeycomb core material sample 100 by an electronic universal tester, wherein the sum of displacement changes indicated by the first signal display 501 and the second signal display 502 is the transverse shrinkage, and dividing the sum by the distance between the first grating displacement sensor 12 and the second grating displacement sensor 13 to obtain the transverse shrinkage; the sum of the displacement changes indicated by the third signal display 601 and the fourth signal display 602 is the longitudinal elongation, and the longitudinal elongation is obtained by dividing the sum by the distance between the third grating displacement sensor 14 and the fourth grating displacement sensor 15; the ratio of the transverse shrinkage to the longitudinal elongation in the elastic range is the poisson ratio of the honeycomb core. The honeycomb core sample 100 was subjected to fracture, and multi-node tensile strength and elongation at break were obtained.
As an alternative embodiment, the first fixture 7 is fixed to the clamped honeycomb core sample 100 by a plurality of first fasteners 16 arranged horizontally, and the second fixture 8 is fixed to the clamped honeycomb core sample 100 by a plurality of second fasteners 17 arranged horizontally.
Specifically, as shown in fig. 2-3, the first fastener 16 and the second fastener 17 are used to fixedly clamp the first clamp 7 and the second clamp 8 on the honeycomb core sample 100, so as to prevent the honeycomb core sample 100 from shaking during the testing process, and influence the measurement accuracy.
As an alternative embodiment, each first fastener 16 is located within the same column of honeycomb cells holding a honeycomb core sample 100 as the corresponding second fastener 17. Specifically, the first fastener 16 and the second fastener 17 may specifically be pins, and their radial dimensions are adapted to the cell sizes of the honeycomb core sample 100. The first fastening members 16 and the corresponding second fastening members 17 are arranged in the same row of honeycomb cells to ensure the uniformity of the stress of the honeycomb sample core 100.
As an alternative embodiment, the honeycomb core sample 100 is further provided with a first mounting member 18 and a second mounting member 19, and the transverse scale 10 and the longitudinal scale 11 are respectively connected to the honeycomb core sample 100 through the corresponding first mounting member 18 and the second mounting member 19. As shown in fig. 2-3, the first mounting member 18 and the second mounting member 19 may specifically be bolts, and the two bolts are respectively located at the center positions of the transverse scale 10 and the longitudinal scale 11.
As an alternative embodiment, the transverse scale 10 is located at the end face longitudinal center position of the honeycomb core sample 100, and the longitudinal scale 11 is located at the end face transverse center position of the honeycomb core sample 100.
Specifically, the strain of the mechanical test sample is generally obtained at the center of the working section. As shown in fig. 2, on the transverse scale 10, the first grating displacement sensor 12, which is close to the cell size, is passed through the cell at the 3 rd cell position on the left, and the grating displacement sensor 22, which is close to the cell size, is passed through the cell at the 3 rd cell position on the left. As shown in fig. 1, the first grating reading head 5 is placed on the front platform of the honeycomb core material sample 100, and the first grating displacement sensor 12 is connected with the first signal display 501 on the first grating reading head 5 through a signal line, where the first signal display 501 can indicate the displacement change of the first grating displacement sensor 12. The second grating displacement sensor 13 is connected to a second signal display 502 on the first grating reading head 5 via a signal line, and the second signal display 502 can indicate the displacement change of the second grating displacement sensor 13.
As shown in fig. 3, on the longitudinal scale 11, a third grating displacement sensor 14 having a size close to that of the honeycomb cells is passed through the cells at the 3 rd cell position from top to bottom, and a fourth grating displacement sensor 15 having a size close to that of the honeycomb cells is passed through the cells at the 3 rd cell position from bottom to top. As shown in fig. 1, the second grating reading head 6 is placed on the platform at the back of the sample, the third grating displacement sensor 14 is connected with a third signal display 601 on the second grating reading head 6 through a signal line, and the third signal display 601 can indicate the displacement change of the third grating displacement sensor 14. The fourth grating displacement sensor 15 is connected to a fourth signal display 602 on the second grating reading head 6 via a signal line, and the fourth signal display 602 may indicate a displacement change of the fourth grating displacement sensor 15.
As an alternative embodiment, as shown in fig. 2-3, the first grating displacement sensor 12 and the second grating displacement sensor 13 are respectively installed at two ends of the transverse scale 10, and the third grating displacement sensor 14 and the fourth grating displacement sensor 15 are respectively installed at two ends of the longitudinal scale 11. The grating displacement sensor should be axisymmetric with the center line as the axis.
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 application 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 above is only 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 application. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (10)
1. The device for testing the poisson ratio of the honeycomb core material under the tensile load is characterized by comprising a force value sensor (1), a first connecting rod (2), a universal adapter (3), a second connecting rod (4), a first grating reading head (5), a second grating reading head (6), a first clamp (7), a second clamp (8), a third connecting rod (9), a transverse scale (10), a longitudinal scale (11), a first grating displacement sensor (12), a second grating displacement sensor (13), a third grating displacement sensor (14), a fourth grating displacement sensor (15) and an electronic universal tester; wherein,
the first end of the force value sensor (1) is connected with the electronic universal testing machine, the electronic universal testing machine is used for applying a tensile load to the honeycomb core material sample (100), the second end of the force value sensor (1) is connected with the universal adapter (3) through the first connecting rod (2), the universal adapter (3) is connected with the first clamp (7) through the second connecting rod (4), the second clamp (8) is connected with the base of the electronic universal testing machine through the third connecting rod (9), and the first clamp (7) and the second clamp (8) are respectively used for clamping the upper end part and the lower end part of the honeycomb core material sample (100);
the transverse scale (10) is transversely arranged on one side end face of the clamping honeycomb core material sample (100), the longitudinal scale (11) is longitudinally arranged on the other opposite side end face of the clamping honeycomb core material sample (100), the first grating displacement sensor (12) and the second grating displacement sensor (13) are respectively connected with the first grating reading head (5), and the third grating displacement sensor (14) and the fourth grating displacement sensor (15) are respectively connected with the second grating reading head (6).
2. The device for testing the poisson ratio of the honeycomb core under the tensile load according to claim 1, further comprising a first fastener (16) and a second fastener (17), wherein the first clamp (7) is fixed with the clamped honeycomb core sample (100) through a plurality of horizontally arranged first fasteners (16), and the second clamp (8) is fixed with the clamped honeycomb core sample (100) through a plurality of horizontally arranged second fasteners (17).
3. The device for testing the poisson's ratio of honeycomb cores under a tensile load according to claim 2, wherein each of said first fasteners (16) and corresponding said second fasteners (17) are located within the same column of honeycomb cells of said clamped honeycomb core sample (100).
4. A device for testing the poisson's ratio of honeycomb cores under tensile load according to claim 2 or 3, characterized in that said first fastening member (16) and said second fastening member (17) are pins, the radial dimensions of which are adapted to the cell dimensions of said clamped honeycomb core sample (100).
5. The device for testing the poisson ratio of the honeycomb core under the tensile load according to claim 1, wherein the first grating reading head (5) comprises a first signal display (501) and a second signal display (502), and the first signal display (501) and the second signal display (502) are respectively connected with the corresponding first grating displacement sensor (12) and the corresponding second grating displacement sensor (13) one by one.
6. The device for testing the poisson ratio of the honeycomb core under the tensile load according to claim 1, wherein the second grating reading head (6) comprises a third signal display (601) and a fourth signal display (602), and the third signal display (601) and the fourth signal display (602) are respectively connected with the corresponding third grating displacement sensor (14) and the corresponding fourth grating displacement sensor (15) one by one.
7. The device for testing poisson's ratio of a honeycomb core under a tensile load according to claim 1, further comprising a first mounting member (18) and a second mounting member (19), wherein the transverse scale (10) and the longitudinal scale (11) are connected to the clamped honeycomb core sample (100) by the corresponding first mounting member (18) and second mounting member (19), respectively.
8. The device for testing poisson's ratio of honeycomb core under tensile load according to claim 1, wherein the transverse scale (10) is located at a longitudinal center position of an end face of the clamped honeycomb core sample (100), and the longitudinal scale (11) is located at a transverse center position of an end face of the clamped honeycomb core sample (100).
9. The device for testing poisson's ratio of honeycomb core under tensile load according to claim 1 or 8, wherein the first grating displacement sensor (12) and the second grating displacement sensor (13) are respectively mounted at both ends of the transverse scale (10), and the third grating displacement sensor (14) and the fourth grating displacement sensor (15) are respectively mounted at both ends of the longitudinal scale (11).
10. The device for testing poisson's ratio of cellular core under tensile load according to claim 1, wherein the first grating reading head (5) and the second grating reading head (6) are both arranged flat on the table top of the electronic universal tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311167822.4A CN117213972A (en) | 2023-09-11 | 2023-09-11 | Testing device for Poisson ratio of honeycomb core material under tensile load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311167822.4A CN117213972A (en) | 2023-09-11 | 2023-09-11 | Testing device for Poisson ratio of honeycomb core material under tensile load |
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| CN202311167822.4A Pending CN117213972A (en) | 2023-09-11 | 2023-09-11 | Testing device for Poisson ratio of honeycomb core material under tensile load |
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