基于自动网格法的硅橡胶温度相关的拉伸力学行为  

Temperature-Dependent Tensile Behavior of Silicon Rubber Using Automated Grid Method

作　　者：吕亚男[1] 郭玲梅 邓志方[2] 汪洋[1] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230026 [2]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《高分子材料科学与工程》2016年第2期104-108,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金委员会和中国工程物理研究院联合基金资助项目(U1230103)

摘　　要：基于自动网格法应变测试技术,在准静态加载条件下对硅橡胶的单向拉伸应力应变行为的温度相关性进行了测试,加载环境温度分别为-50℃,-20℃,20℃和50℃。实验结果表明,采用光学测量技术可以准确地获得试件应变场信息;硅橡胶在中等变形范围内的拉伸力学行为呈现明显的非线性弹性特征,且力学性能具有温度相关性,其模量和定伸长下的应力均随着测试温度的升高而降低。基于体积不可压缩假设,采用修正的超弹性本构模型较好地表征了硅橡胶温度相关的拉伸力学行为。Based on the automated grid method for strain measurement,the effect of temperature on the uniaxial tensile stress-strain behavior of silicon rubber was investigated under quasi-static loading conditions. The testing temperatures is- 50 ℃,- 20 ℃,20 ℃ and 50 ℃,respectively. Experimental results indicate that the strain field in the specimen can be captured accurately using the optical measuring technique. The tensile behavior of silicon rubber within the moderate deformation range exhibits obvious nonlinear elastic characteristics. Tensile properties of silicon rubber are dependent on temperature. The values of modulus and stress at a specified elongation decrease with increasing temperature. According to the incompressibility hypothesis,a modified hyperelastic constitutive model was proposed to describe the temperature-dependent tensile behavior of silicon rubber.

关 键 词：硅橡胶 拉伸行为 温度相关性 本构模型 

分 类 号：TQ333.93[化学工程—橡胶工业]