热致非晶态形状记忆聚合物的热粘弹性参数及回复行为  

Thermovisoelastic Parameters and Recovery Behaviors of Thermally Activated Amorphous Shape Memory Polymers

作　　者：顾建平[1,2,3] 孙慧玉[1] 方建士[2,3] 方常青[1] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,江苏南京210016 [2]江苏省先进结构材料与应用技术重点实验室,江苏南京211167 [3]南京工程学院材料工程学院,江苏南京211167

出　　处：《高分子材料科学与工程》2016年第6期107-112,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(11572153;11302096);江苏省自然科学基金资助项目(BK20151467);江苏省研究生培养创新工程(KYLX_0221);中央高校基本科研业务费专项资金资助;江苏高校优势学科建设工程资助项目;机械结构力学及控制国家重点实验室(南京航空航天大学)自主研究课题(0214G02)

摘　　要：分别采用非线性拟合应力松弛主曲线及单个常频率条件下变温动态力学分析(DMA)实验中储能模量与损耗角正切曲线的方式,获取热致非晶态形状记忆聚合物(SMP)多重松弛模型中的热粘弹性参数。结合广义有限变形粘弹性理论和KAHR33参数热变形模型在有限元软件平台研究了该SMP的自由回复与约束回复行为。仿真结果与实验数据相符较好,说明该建模方法的合理性及获取的热粘弹性参数的准确性。相比构建应力松弛和储能模量主曲线而言,单个DMA实验数据更易得到,因此对其拟合能大幅减少实验成本。The thermoviscoelastic parameters of the multiple relaxation model for the thermally activated amorphous shape memory polymers（ SMPs） were determined from the stress relaxation master curve and from the storage modulus and the loss angle of a single dynamic mechanical analysis（ DMA） temperature sweep at constant frequency by the nonlinear regression method,respectively. The behaviors of the free recovery and the constrained recovery of the SMP were studied in Abaqus coupled with the generalized finite deformation viscoelastic theory and KAHR 33-parameter model of thermal expansion. For the simulation results fit well with the test data,it is proved that the modeling approach is reasonable and the thermoviscoelastic parameters obtained by the approaches are precise. Since it is complicated to construct the stress relaxation and the storage modulus master curves,the approach by which the thermoviscoelastic parameters are determined from a single DMA could significantly reduces expenses on experiment.

关 键 词：形状记忆聚合物 有限变形 非线性拟合 热粘弹性参数 回复行为 

分 类 号：TB381[一般工业技术—材料科学与工程]