苯乙烯基形状记忆聚合物热力学行为的有限元分析  

FINITE ELEMENT ANALYSIS ON THERMO-MECHANICAL BEHAVIOR OF STYRENE-BASED SHAPE MEMORY POLYMERS

作　　者：周博[1,2] 刘彦菊[3] 冷劲松[2] 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,哈尔滨150001 [2]哈尔滨工业大学复合材料与结构研究所,哈尔滨150080 [3]哈尔滨工业大学航天科学与力学系,哈尔滨150001

出　　处：《高分子学报》2009年第6期525-529,共5页Acta Polymerica Sinica

基　　金：国家高技术研究发展计划(863计划;项目号2006AA03Z109);国家自然科学基金(基金号95505010);中国博士后科学基金(基金号20080430933)资助项目

摘　　要：对苯乙烯基形状记忆聚合物进行了拉伸实验研究,测定了该材料在25℃、30℃、40℃和50℃时的弹性模量和屈服极限.根据实验结果,建立了苯乙烯基形状记忆聚合物的材料参数方程,描述了苯乙烯基形状记忆聚合物在玻璃体转化过程中,材料参数和温度的关系.在假设形状记忆聚合物为各向同性材料的基础上,将Tobushi等建立的热力学本构方程从一维扩展到三维.基于有限元分析软件ABAQUS的二次开发功能,针对上述本构方程和材料参数方程,编写了可供ABAQUS调用的UMAT函数,并对苯乙烯基形状记忆聚合物实现形状记忆效应的高温变形、应力冻结和形状恢复等热力学过程,进行了有限元数值模拟分析.Tensile tests at various temperatures are conducted to detect the relationship of material strain and stress of the styrene-based shape memory polymers （SMP）. The material elastic modulus and yielding limit stresses at the temperatures of 25℃, 30℃ ,40℃ and 50℃ are determined according to the results of tensile tests. In order to describe the glass transition behavior of the styrene-based SMP, a new material parameter function is supposed based on the results of the tensile tests. The styrene-based SMP is assumed as an isotropic material, then a three- dimensional thermo-mechanical constitutive thermo-mechanical constitutive equation. In equation of SMP is developed based on Tobushi＇ s one-dimensional order to perform finite element analysis on SMP by using ABAQUS, a UMAT subroutine for ABAQUS is programmed with Fortran codes based on the three-dimensional constitutive equation and the new material parameter function. The shape memory thermo-mechanical process of styrene-based SMP is numerically simulated by ABAQUS coupled with the UMAT subroutine, which includes deformation at a high temperature upon loading, shape fixity due to cooling and shape recovery through heating. Numerical results show that the thermo-mechanical behavior of SMP can be well simulated by ABAQUS coupled with the UMAT subroutine.

关 键 词：形状记忆聚合物 高温变形 应力冻结 形状恢复 UMAT函数 

分 类 号：O631.3[理学—高分子化学]