对橡胶材料试样进行单轴拉伸和拉/剪循环加载试验，研究其在双向载荷历程作用下的Mullins软化诱导各向异性。试验发现试样在先后不同方向载荷作用下会产生Mullins软化诱导各向异性，且随载荷逐渐增大而增大。基于伪弹性本构理论，采用最小二乘法拟合橡胶试样双向载荷历程循环加载试验数据，得出橡胶Mullins软化诱导各向异性参数。使用各向异性参数修正伪弹性本构模型软化效应控制参数，采用分步加载和网格映射方式对承受垂向压缩和横向剪切载荷的锥形橡胶弹簧承载刚度进行仿真预测，并通过锥型橡胶弹簧台架刚度试验验证，结果表明使用Mullins软化诱导各向异性参数能够显著提高橡胶弹性元件多向承载刚度预测精度。
丁智平
,
李飞
,
卜继玲
,
黄友剑
,
黄达勇
. Mullins诱导各向异性及橡胶弹性元件多向刚度预测[J]. 机械工程学报, 2017
, 53(14)
: 144
-149
.
DOI: 10.3901/JME.2017.14.144
By carrying out experiments of rubber specimens under uniaxial tension and tension/pure shear cyclic load, the Mullins softening induced anisotropy of rubber material is studied under biaxial load history effect. The results show that the rubber specimen will produce Mullins softening induced anisotropy in different directions under loading, and increases as the load increases. Based on the pseudo elastic constitutive theory, using least square fitting the rubber specimen's data of experiments under bidirectional cyclic load history, the Mullins softening induced anisotropic parameters are obtained. Then these anisotropic parameters are used to fix softening effect control parameters of pseudo elastic constitutive model and to simulate the stiffness of conical rubber spring with step by step load and grid map way under vertical compressive and transverse shear load by finite element analysis. By means of conical rubber spring suspension stiffness tests, the results show that Mullins softening induced anisotropy parameters can significantly improve the prediction accuracy of multi-directional stiffness of rubber elastic component.
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