Biaxial tensile test device and method for test piece
A test and biaxial stretching technology, which is applied in the direction of measuring devices, applying stable tension/pressure to test the strength of materials, instruments, etc., can solve the problems of cumbersome use, high cost, and affecting test results, so as to ensure consistency, Guidance is smooth and accurate, and the effect of reducing requirements
Pending Publication Date: 2021-11-05
SUZHOU SINNOTECH ELECTRONICS TECH
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Problems solved by technology
In the prior art, special testing machines are required, such as four-axis hydraulic testing machines, biaxial testing machines (CN107271287), etc., which are expensive and cumbersome to use
When using a universal testing machine, due to the non-center positioning of the test piece, the four axes do not move at the same time, resulting in problems such as eccentric loads, which affect the test results; factors such as the lack of guide devices for the upper and lower fixtures may cause poor repeatability of the test results
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[0047] The present invention will be described in detail in conjunction with accompanying drawing now. This figure is a simplified schematic diagram only illustrating the basic structure of the present invention in a schematic manner, so it only shows the components relevant to the present invention.
[0048] Such as figure 1 with figure 2 As shown, it is a schematic diagram of the structure of the test piece 5. The test piece 5 is cross-shaped, including four stretching fins 5-1, and the upper and lower sides of the common connecting ends 5-2 of the four stretching fins 5-1 are respectively A positioning groove 5-3 is provided, and the shape of the positioning groove 5-3 includes but is not limited to circular, elliptical, polygonal, etc., as long as the positioning in the horizontal plane and the vertical plane can be realized at the same time, that is, central positioning can be realized. In the present embodiment, the preferred positioning groove 5-3 is rectangular, and...
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The invention relates to the technical field of material performance detection, and provides a biaxial tensile test device and method for a test piece, an upper positioning assembly is arranged below an upper bottom plate, a lower positioning assembly is arranged above a lower bottom plate, and the upper positioning assembly and the lower positioning assembly are coaxially arranged up and down and are matched with each other for center positioning of the test piece; the four gear and rack assemblies are annularly arrayed between the upper bottom plate and the lower bottom plate by taking the axis of the upper positioning assembly and the axis of the lower positioning assembly as the center, each gear and rack assembly is provided with a clamping end for applying tensile force to the tensile fins, and during testing, two-way tensile force parallel to the plane where the test piece is located is applied to the test piece through the gear and rack assemblies; the strain acquisition assembly acquires the dependent variable of the test piece; and the stress acquisition assembly acquires the stress applied to the test piece by the clamping end. The test piece can be quickly positioned through the upper positioning assembly and the lower positioning assembly, the positioning precision is high, the four-axis movement consistency can be ensured by adopting a gear rack mechanism, and the tensile test stress balance on the test piece is ensured.
Description
technical field [0001] The invention relates to the technical field of material performance detection, in particular to a test device and a test method for a bidirectional tensile test of a specimen. Background technique [0002] Before the material is applied to the project, it is necessary to test the performance of the material to judge whether it meets the application requirements. Among them, the ability of the material to axially bear tensile and fatigue loads is a key performance. In the prior art, it is necessary to use a special testing machine, such as a four-axis hydraulic testing machine, a biaxial testing machine (CN107271287), etc., which are expensive and cumbersome to use. When using a universal testing machine, due to the non-center positioning of the test piece, the four axes do not move at the same time, resulting in problems such as eccentric loads, which affect the test results; factors such as the lack of guide devices for the upper and lower fixtures ...
Claims
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IPC IPC(8): G01N3/08G01N3/06
Inventor 孟彬彬王策王振李仁龙叶茂
Owner SUZHOU SINNOTECH ELECTRONICS TECH