硅橡胶泡孔材料在压缩条件下的多尺度模拟

Multi-scale Simulation of Silicone Rubber Foam Under Compression

本文基于多尺度方法,研究硅橡胶泡孔材料在压缩条件下的力学行为。首先对基体材料即硅橡胶进行单轴压缩试验,拟合试验数据并得到基体材料的唯象本构关系。据此模拟细观胞元结构的单轴压缩过程,并将模拟所得的应力应变关系植入均匀化后的宏观有限元模型。结果表明宏观模型的有模元模拟结果与两组泡孔材料的试验数据均吻合良好。本文分析了误差产生的原因,并说明随着试样孔隙率的增加,模拟结果与试验数据之间的误差增大。最后,本文预测了不同孔隙率的硅橡胶泡孔材料在压缩条件下的应力-应变关系。本研究中采用的多尺度方法计算效率高,且适用于任意泡孔形状和泡孔密度的聚合物多孔材料。

Based on multi-scale simulation,the mechanical behavior of silicon rubber foam under compression was investigated.The base material,i.e.,silicon rubber was firstly uniaxially compressed,and the experimental data were fitted to form a phenomenological constitutive relationship.Based on the relationship,the micro-scale unit cell model was numerically investigated,and the obtained stress-strain relation under uniaxial compression was implanted into the macro-scale homogeneous model.Good agreements are achieved between the finite element simulation results and the experimental data for tow silicon rubber foams with different porosities.The generation of errors between the simulation results and experimental data are analyzed.It has been found that the error increases with the increase of the porosity of specimen.Finally, the stress-strain relations of silicon rubber foam with different porosity are predicted.The multi-scale simulation of the mechanical behavior of silicon rubber foam is proved of high efficiency,and such a process is applicable to polymer with any porous geometry and density.