Multiaxial tensile test method for rubber materials under the same Mullins effect

Abstract

The invention provides a multi-axial tensile test method for rubber materials under the same Mullins effect, relates to the technical field of mechanical property experiments of rubber materials, and includes the following steps: tensile test of the initial state of the material, multi-axial cyclic loading mechanical property test, and subsequent When loading the tensile curves with fixed elongation on different sides, the starting point can be translated to the origin, and the curve with the same loading times can be selected as the multi-axial tensile data under the same Mullins effect to perform parameter fitting to determine a suitable material model and parameters to carry out finite element numerical simulation of material mechanical properties or theoretical calculation of material stiffness. This method can control the tensile length of the experiment accordingly, and will not cause the damage state of the material to change continuously during the test. The measured experimental data corresponds to the same material state, and there will be no large error, so as to avoid major problems in scientific research and engineering applications.

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...

AI Technical Summary

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 these experiments It does not correspond to the same material state, resulting in a large error, causing major problems in scientific research and engineering applications

At present, there is no test plan for the mechanical properties of materials under the same damage state and different deformation states

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