Multi-axial tensile test method for rubber material under same Mullins effect

A rubber material, tensile test technology, applied in the direction of analyzing materials, using stable tension/pressure testing material strength, measuring devices, etc., can solve the problems of no material mechanical properties, errors, etc., to achieve accurate elastic properties, accurate Predicted and Calculated Effects

Active Publication Date: 2019-12-17
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

In the existing material tests, different types of material tests are carried out successively, and the lack of corresponding control over the tensile length of the test may cause the damage state of the material to change continuously during the test. Therefore, the measured experimental data of the...

Method used

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  • Multi-axial tensile test method for rubber material under same Mullins effect
  • Multi-axial tensile test method for rubber material under same Mullins effect
  • Multi-axial tensile test method for rubber material under same Mullins effect

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Embodiment 1

[0029] The multiaxial tensile test method of rubber materials under the same Mullins effect can be used in engineering to measure the mechanical properties of rubber materials in a certain damage state. The specific experimental program flow is shown in the attached drawing Figure 5shown. Assume that the lateral (x-direction) constraints are 0, Δ, 2Δ, 3Δ four fixed elongation ratios, and the y-direction is also Δ, 2Δ, 3Δ four kinds of elongation ratios. That requires making 4 biaxial tensile test specimens. Each test sample is first stretched in the y-direction with no constraints in the x-direction and three fixed constraints of Δ, 2Δ, and 3Δ. The stretching length in the y-direction is Δ. In this way, the material tensile curves in four cases are measured. Then select a new sample 5 to carry out one time of unconstrained x-direction y-direction two cyclic stretches, and Δ, 2Δ, 3Δ three kinds of x-direction fixed elongation y-direction single stretching, if the loading curv...

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Abstract

The invention provides a multi-axial tensile test method for a rubber material under the same Mullins effect, and relates to the technical field of mechanical property experiments of the rubber material. The method comprises the following steps that tensile test is carried out on the initial state of the material; multi-axis cyclic loading mechanical property test is carried out; a tensile curve with fixed elongation rates on different side surfaces is loaded subsequently, a starting point can be translated to the original point, curves with the same loading frequency are selected as multi-axis tensile data under the same Mullins effect, parameter fitting is carried out to determined a proper material model and related parameters, and thus, finite element numerical simulation of material mechanical properties or theoretical calculation of the material rigidity is realized. According to the method, the tensile length of experiment is controlled correspondingly, damage state of the material is not changed constantly during test, measurement experiment data measured by the experiment corresponds to the same material state, large errors are not generated, and serious problems in scientific research and engineering application are avoided.

Description

technical field [0001] The invention relates to the technical field of mechanical property experiments of rubber materials, in particular to a multiaxial tensile test method of rubber materials under the same Mullins effect. Background technique [0002] Mullins effect refers to the phenomenon that the stiffness of the material in the subsequent loading is less than the initial loading stiffness, as shown in the accompanying drawings figure 1 shown. The Mullins effect causes the internal damage of the material, which changes the damage state of the material, making the stiffness of the subsequent loading curve less than the initial loading stiffness. However, this effect has certain limitations, and the damage state will not change when the subsequent loading does not exceed a certain threshold; when the loading exceeds this threshold, the properties of the material are the same as the initial loading, as shown in the accompanying drawings figure 2 shown, but the stiffnes...

Claims

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0003G01N2203/0017G01N2203/0208G01N2203/0254G01N2203/0676G01N2203/0682
Inventor 魏志刚周建雄毛欢
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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