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

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...

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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