玻璃纤维增强环氧树脂低温收缩应变的计算模型及应用  

Calculation model and application of low temperature shrinkage strain of GFEP

作　　者：孙静[1] Sun Jing(Liaoning Institute of Foreign Trade and Economic Cooperation,Dalian 116052,China)

机构地区：[1]辽宁对外经贸学院,辽宁大连116052

出　　处：《合成树脂及塑料》2021年第1期64-68,共5页China Synthetic Resin and Plastics

摘　　要：设计了玻璃纤维增强环氧树脂(GFEP)在低温条件下收缩应变的计算模型,通过对GFEP进行低温实验,得到了GFEP的力学响应。结果表明:温度低于50 K时,随着温度的升高,GFEP的横纵向收缩率均变化不大;温度高于50 K时,随着温度的升高,其横纵向收缩率均增加较快;GFEP在-30℃时的拉伸强度、弹性模量较常温时大。实验测试数据与采用有限元计算的90°方向的应力-应变曲线比较吻合,两者的拉伸应力几乎无差别,验证了材料本构方程的正确性。引入有限元分析可以对GFEP的本构方程进行检验。通过Umat软件,可实现预测0°方向及90°方向材料的拉伸应力-应变曲线的非线性行为。The calculation model of shrinkage strain of glass fiber reinforced epoxy resin(GFEP)at low temperature was designed.The mechanical response of GFEP was obtained by low temperature experiment.The results show that the transverse and longitudinal shrinkage of GFEP change little with the increase of temperature when the temperature is lower than 50 K.The transverse and longitudinal shrinkage of GFEP increase rapidly with the increase of temperature when the temperature is higher than 50 K.The tensile strength and elasticity modulus of GFEP at-30℃ are larger than those at room temperature.The experimental data conform closely to the 90°stress-strain curve calculated by finite element method,and there is almost no difference in the tensile stress between them,which verifies the correctness of the material constitutive model.The constitutive equation of GFEP can be tested by introducing finite element analysis.The nonlinear behavior of tensile stress-strain curves in 0°and 90°can be predicted via Umat software.

关 键 词：玻璃纤维增强环氧树脂 收缩应变 低温 本构方程 

分 类 号：TQ327[化学工程—合成树脂塑料工业] TK39[动力工程及工程热物理—热能工程]