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Mechanical Behaviour of Rubber Material with Consideration to Mullins Effect

机译：橡胶材料考虑到穆林斯效应的力学行为

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A stress softening known as the Mullins effect is observed usually in rubberlike material after the first load. This paper describes an experimental test method for defining the nonlinear properties of rubber materials used for finite element analysis. Experimental observations have shown that the Mullins effect induces a permanent set and some anisotropy. To test the Mullins effect the mechanical preconditioning is suggested to stabilize the properties of rubber material. A stress-strain curve will change significantly when the rubber material is strained greater than the previous stabilized level. Therefore, material properties at maximum strain level are obtained to predict behavior of rubber products. To obtain the rubber material constants used for finite element analysis to understand the characteristics of automotive rubber parts, mechanical properties tests such as uniaxial tension, equ-biaxial tension and pure shear tests are required. When the load was repeatedly applied to the rubber specimen, the stress-strain relationship was greatest in the first and second cycles, and the larger the strain range, the more the stress was reduced. The material constants were obtained using the stress-strain data after the rubber specimen was stabilized. The value of stiffness decreased as the maximum strain range increased. The static stiffness of an automotive engine mount is calculated by nonlinear finite element analysis using the experimentally determined material constants and compared with the experimental results considering the mechanical preconditioning effect resulting in a good correlation.
机译：在第一载荷之后通常以橡皮状材料观察为毫流效应的应力软化。本文介绍了用于定义用于有限元分析的橡胶材料的非线性性能的实验试验方法。实验观察结果表明，穆林斯效应诱导永久组和一些各向异性。为了测试Mullins效果，建议稳定机械预处理以稳定橡胶材料的性能。当橡胶材料应变大于先前的稳定水平时，应力 - 应变曲线会显着变化。因此，获得最大应变水平的材料特性以预测橡胶产物的行为。为了获得用于有限元分析的橡胶材料常数以了解汽车橡胶部件的特性，需要单轴张力，平等双轴张力和纯剪切试验等机械性能试验。当载荷重复施加到橡胶标本时，在第一和第二循环中，应力 - 应变关系最大，应变范围越大，应力越大。在橡胶样品稳定后，使用应力 - 应变数据获得材料常数。随着最大应变范围的增加，刚度的值降低。通过使用实验确定的材料常数的非线性有限元分析来计算汽车发动机支架的静刚度，并与考虑机械预处理效果的实验结果相比，导致良好的相关性。

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