发泡硅橡胶本构模型与力学性能的研究

Constitutive Model and Mechanical Performance of Foamed Silicone Rubber

基于Neo-Hookean与Yoeh超弹性材料本构模型和发泡硅橡胶细观结构,将发泡硅橡胶的孔隙率作为参数引入应变能密度函数和本构方程中,建立了发泡硅橡胶力学性能预测模型,同时采用有限元分析和试验方法,对发泡硅橡胶单轴压缩和简单剪切两种工况下的力学性能进行研究。通过比较理论模型、有限元模拟和试验结果,发现采用基于发泡硅橡胶细观结构建立的理论模型可以有效地描述发泡硅橡胶力学性能。试验研究了加载速率和环境温度对发泡硅橡胶力学性能的影响,为发泡硅橡胶的应用提供依据。

Combining the Neo-Hookean and Yeoh ’s constitutive models of hyperelastic materials with the microstructures in foamed silicone rubber,the porosity of the silicone rubber was introduced to the strain energy density functions and constitutive equations as a parameter,and the prediction model for the mechanical properties of the foamed silicone rubber was established. The mechanical properties under uniaxial compression and simple shear were also investigated by using finite element method(FEM)and mechanical experiments, respectively. The results showed that the theoretic models based on the microstructure of foamed silicone rubber could well describe its mechanical response. Moreover, the effects of loading rate and environmental temperature on the mechanical properties of foamed silicone rubber were studied,which provided the guidance to its applications.