【摘要】 考虑蠕变残余应变的温度相关性,假设形状记忆聚合物为各向同性材料,将一维热力学本构方程扩展到三维。基于该增量形式的本构,在有限元软件ABAQUS中开发了适用于模拟形状记忆聚合物形状记忆过程的材料接口子程序,对形状记忆聚合物记忆过程进行有限元模拟。分析了加载速率和变温速率对形状记忆聚合物的热力学性能和记忆性能的影响,数值模拟的结果与实验吻合良好。更多还原

【Abstract】 Assuming shape memory polymers to be isotropic,with consideration of temperature-dependent creep residual strain,a three-dimensional thermo-mechanical constitutive equation of shape memory polymers( SMPs) is derived from one-dimensional constitutive relationship based on viscoelastic theory. A user material subroutine program of the CAE software ABAQUS is compiled to simulate the memory process. Strain / temperature rates impact on the thermo-mechanical and shape memory properties of SMPs is analyzed and it shows a good agreement with the experimental data.更多还原