有机玻璃PMMA常温下的动态本构关系  

Dynamic constitutive model of PMMA at room temperature

作　　者：于鹏[1] 姚小虎[1] 韩强[1] 臧曙光[2] 李志强[3] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]中国建筑材料检验认证中心,北京100024 [3]太原理工大学应用力学研究所,山西太原030024

出　　处：《爆炸与冲击》2013年第S1期88-91,共4页Explosion and Shock Waves

基　　金：国家自然科学基金项目(11372113;11072166);国家国际科技合作专项(2011DFA53080);爆炸科学与技术国家重点实验室基金项目(KFJJ14-2M);亚热带建筑科学国家重点实验室基金项目(2014ZC18)

摘　　要：采用SHPB(分离式霍普金森压杆)实验,对有机玻璃聚甲基丙烯酸甲酯(PMMA)在常温下的动态力学性能进行了研究。结果表明,在常温、高应变下,PMMA材料在弹性阶段就发生破坏,无法进入塑性阶段,表现出脆性材料特征,同时,其弹性模量并没有表现出十分明显的率相关性。在此基础上,采用黏弹性本构方程描述PMMA,并对其本构参数进行了拟合,拟合结果也进一步验证了实验的相关结论。The split Hopkinson pressure bar(SHPB)experiments were conducted to investigate the dynamic characteristics of the organic polymer glass,polymethyl methacrylate(PMMA)at room temperature.The experimental results display that PMMA at room temperature and high strain rates may undergo failure in the elastic stage and cannot enter the plastic stage,which exhibits a brittle behavior rather than a ductile one.And the elastic module of PMMA seems not to be obviously rate-dependent.Based on the above,the mechanical properties of PMMA were described by using a viscoelastic constitutive model and the relevant constitutive parameters were determined by the fitting methods.The fitted results further validated the conclusion obtained by the experiments.

关 键 词：固体力学 动态本构 SHPB PMMA 应变率 

分 类 号：TQ323.42[化学工程—合成树脂塑料工业]