PMMA变温松弛模量获取方法的实验研究  

The Experimental Study of PMMA Variable Temperature Relaxation Modulus Method

作　　者：傅志红[1] 王志伟[1] 尹业刚 姚晨[1] 

机构地区：[1]中南大学机电工程学院高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《塑料工业》2014年第9期51-54,79,共5页China Plastics Industry

基　　金：长沙市科技计划项目(K1303004-11)

摘　　要：聚甲基丙烯酸甲酯(PMMA)在不同温度条件下进行拉伸应力松弛实验,获取了恒温条件下的松弛模量曲线,并对其进行温度修正,建立折合模量-时间对数曲线图。利用最小二乘法平移原理计算出时温等效因子,确立WLF方程参数。对其参考温度下的松弛模量进行了基于Prony级数的拟合,建立了材料Wiechert黏弹性参数模型,且实验结果与仿真结果吻合性比较好,为后续的数值仿真和实验研究提供了理论的指导作用。The stress relaxation experiment of PMMA under different temperature was carried out.The relaxation modulus curve under the condition of constant temperature was obtained,which was corrected by temperature,and a logarithmic equivalent modulus-time logarithmic curve was established.The equivalent factor of time and temperature was calculated by the transferred theory based on the least square method,and parameters of WLF equation were established.The relaxation modulus based on the Prony series at the reference temperature was fitted,parameters of the Wiechert viscoelastic model were established,and the anastomotic property of test result and simulation was well which provided a theoretical guidance for subsequent the numerical simulation and experiment research.

关 键 词：应力松弛 平移理论 时温等效因子 黏弹性模型 聚甲基丙烯酸甲酯 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业]