CN216560014U

CN216560014U - Clamp suitable for uniaxial tensile test of foam metal material

Info

Publication number: CN216560014U
Application number: CN202122494275.3U
Authority: CN
Inventors: 鞠晓喆; 黄俊想; 江祎楠; 许杨剑; 梁利华
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2021-10-15
Filing date: 2021-10-15
Publication date: 2022-05-17
Anticipated expiration: 2031-10-15

Abstract

The utility model discloses a clamp suitable for a foam metal material uniaxial tensile test, which comprises a first sleeve, a clamp body, a second sleeve, a separation blade, a clamping piece and an auxiliary clamping piece, wherein the first sleeve is arranged on the first sleeve; one end of the fixture body is connected with the first sleeve, and the other end of the fixture body is connected with the second sleeve; the two baffle plates are symmetrically fixed on the inner side of the jaw of the fixture body; clamping pieces are respectively fixed on the blocking pieces and are connected with the auxiliary clamping pieces. The foam metal sample and the clamp are in surface contact, so that the stress concentration of a clamping part is reduced, the risk of damage of the sample at the end part is reduced, and the accuracy of a stretching result is effectively improved.

Description

Clamp suitable for uniaxial tensile test of foam metal material

Technical Field

The utility model belongs to the technical field of foam metal tensile tests, and particularly relates to a foam metal uniaxial tensile test clamp and a test method.

Background

Porous metal materials are frequently adopted in the fields of mechanical engineering such as aviation, aerospace, automobiles, energy sources and the like, particularly, the production technology of the foam metal materials is mature in recent years, and the research pace of people on the foam metal materials is accelerated. The clamping pieces of the existing clamp generally adopt the insections with parallel surfaces, the contact between the clamping pieces and a test piece is less, and the surface of a foam metal material is easy to damage and slip in the stretching process, so that the traditional flat and sharp insection clamp cannot meet the test requirements.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a clamp suitable for a foam metal material uniaxial tensile test, which is used for solving the problems of tensile failure or large result error of the foam metal uniaxial tensile test caused by slippage between a foam metal sample and the clamp in the existing foam metal uniaxial tensile test.

In order to achieve the purpose, the technical scheme of the utility model is as follows: a clamp suitable for a uniaxial tensile test of a foam metal material comprises a first sleeve, a clamp body, a second sleeve, a retaining sheet, a clamping sheet and an auxiliary clamping sheet; one end of the fixture body is connected with the first sleeve, and the other end of the fixture body is connected with the second sleeve; the two baffle plates are symmetrically fixed on the inner side of the jaw of the fixture body; clamping pieces are respectively fixed on the blocking pieces and are connected with the auxiliary clamping pieces.

Further, the shape of the clamp body is triangular.

Furthermore, the contact surface between the clamping piece and the auxiliary clamping piece is provided with anti-skid patterns.

Further, the auxiliary clip is connected with the foam metal sample.

Further, the foam metal test piece is in a rectangular plate shape.

Furthermore, a through hole is formed in the middle of the foam metal sample.

The utility model has the beneficial effects that: the auxiliary clamp is adopted, and the auxiliary clamp is matched with the clamping clamp to realize the close contact between the surfaces; epoxy AB glue is used between the auxiliary clamp and the sample. The design can reduce the deformation of the clamped sample and the error of the test result caused by the phenomenon of local damage and slippage; in the design of the test specimen: activating the size effect of a plate-shaped sample with a hole in the middle; the foam metal sample and the clamp are in surface contact, so that the stress concentration of a clamping part is reduced, the risk of damage of the sample at the end part is reduced, and the accuracy of a stretching result is effectively improved.

Drawings

FIG. 1 is a schematic view of a foamed metal uniaxial tensile test fixture;

FIG. 2 is a front view of a foam metal uniaxial tensile test auxiliary clip and a sample;

FIG. 3 is a top view of a metal foam uniaxial tensile test auxiliary clip and a sample;

FIG. 4 is a schematic view of the connection of a fixture and a sample for uniaxial foam tensile test;

FIG. 5 is a schematic view of an auxiliary clip;

FIG. 6 is a perspective view of a foam metal uniaxial tensile test fixture;

in the figure, 1, a first sleeve; 2. a clamp body; 3. a second sleeve; 4. a threaded hole; 5. a baffle plate; 6. a clip; 7. an auxiliary clip; 8. foam metal test specimens.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the following embodiments further describe the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

As shown in fig. 1 to 6, the utility model discloses a clamp suitable for a uniaxial tensile test of a foam metal material, which comprises a first sleeve 1, a clamp body 2, a second sleeve 3, a baffle 5, a clamping piece 6 and an auxiliary clamping piece 7. One end of the clamp body 2 is connected with the first sleeve 1, and the other end of the clamp body is connected with the second sleeve 3. The shape of the clamp body 2 is preferably triangular. The two blocking pieces 5 are respectively and symmetrically fixed on the inner side of the jaw of the fixture body 2 through the threaded holes 4. The separation blades 5 are respectively fixed with a clamping piece 6, and the clamping pieces 6 are connected with an auxiliary clamping piece 7. The contact surface between the clamping piece 6 and the auxiliary clamping piece 7 is respectively provided with an anti-skid pattern, so that the foam metal sample 8 and the clamp body 2 are tightly attached to each other.

A baffle plate is fixed at the lower end of the second sleeve 3 and is used as a force application device of the adjusting clamping piece 6.

An auxiliary clamping piece 7 is arranged between the clamp body 2 and the foam metal sample 8, and the foam metal sample 8 and the auxiliary clamping piece 7 are bonded by using epoxy resin AB glue. The back of the auxiliary clamping piece 7 is provided with a sawtooth or right-angle trapezoidal contact surface, and the other surface is a smooth plane.

The foam metal sample 8 is formed by cutting a rectangular plate shape and is in a rectangular plate shape; the middle of the foam metal sample 8 is provided with a through hole, and the cross section area of the through hole is smaller, so that the size effect of the sample can be activated.

As shown in fig. 4, the working process of the clamp disclosed by the utility model specifically comprises the following steps:

firstly, the left side and the right side of a foam metal sample 8 are respectively adhered with an auxiliary clamping piece 7, and epoxy resin AB glue is dripped between the smooth surface of the auxiliary clamping piece 7 and the foam metal sample 8, so that the residual gap between a clamping end and the foam metal sample 8 is partially eliminated, and the contact surface between the foam metal sample 8 and a clamp is ensured to be tightly attached; and (3) loading the bonded foam metal sample 8 into a triangular test fixture, and mounting the foam metal sample on a tensile testing machine through the fixture.

When the test piece is stretched under the action of stretching stress, the clamping piece provides an initial pre-tightening under the action of the inclined plane; in the uniaxial tension test process, the clamped sample is attached to the surface of the clamp, and the tensile force is partially converted into clamping force for the clamped sample under the action of the inclined surface; because the inclined plane can be to the inboard extrusion, foam metal can zonulae occludens under extrusion and bonding, reduces the possibility of sliding, reduces the deformation of centre gripping test piece, and the error that the phenomenon of skidding brought the test result is slided in local damage.

And finally, acquiring experimental data output by the tensile testing machine, analyzing a stress-strain curve, and analyzing the mechanical property of the foam metal sample 8.

The above description is intended only to illustrate the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention, which is intended to cover all modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. The clamp suitable for the uniaxial tensile test of the foam metal material is characterized by comprising a first sleeve (1), a clamp body (2), a second sleeve (3), a baffle (5), a clamping piece (6) and an auxiliary clamping piece (7); one end of the clamp body (2) is connected with the first sleeve (1), and the other end of the clamp body is connected with the second sleeve (3); the two baffle plates (5) are symmetrically fixed on the inner side of the jaw of the clamp body (2); the separation blade (5) is respectively fixed with a clamping piece (6), and the clamping piece (6) is connected with an auxiliary clamping piece (7).

2. The clamp for uniaxial tension test of foamed metal material according to claim 1, wherein the shape of the clamp body (2) is triangular.

3. The clamp for uniaxial tension test of foamed metal material according to claim 1, wherein the contact surface between the clamping piece (6) and the auxiliary clamping piece (7) is provided with an anti-skid pattern.

4. The clamp for uniaxial tension test of foamed metal material according to claim 1, wherein the auxiliary jaw (7) is connected with a foamed metal sample (8).

5. The jig for uniaxial tension test of a foamed metal material according to claim 4, wherein the foamed metal test piece (8) has a rectangular plate shape.

6. The clamp for uniaxial tension test of foamed metal material according to claim 4, wherein the middle part of the foamed metal sample (8) is provided with a through hole.