高密度聚乙烯单轴拉伸力学性能及本构关系研究  

Research on Uniaxially Tensile Mechanical Properties and Constitutive Model of High Density Polyethylene

作　　者：马赛尔 许进升[1] 童心[1] 周长省[1] 李昊[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《中国塑料》2016年第4期88-92,共5页China Plastics

基　　金：江苏省青年基金项目(BK20140772);中央高校基本科研业务费专项资金资助(30915011301)

摘　　要：利用万能试验机对高密度聚乙烯(PE-HD)进行了单轴拉伸试验,并选取了有效数据进行分析,得到了PE-HD的应力-应变曲线,并利用Sherwood-Frost本构模型研究了PE-HD单轴拉伸的力学行为。结果表明,PEHD的力学性能表现为明显的应变率相关性,屈服应力随着应变率的增大而提高,且屈服应力表现为应变率对数的线性关系;Sherwood-Frost本构模型能较好地描述PE-HD的力学特性。In order to study the constitutive behaviour of high density polyethylene, uniaxial tension experiments were performed to obtain stress-strain curves. The experimental results indicated that the mechanical properties of PE-HD was strain rate-dependent, the yield strength increased obviously with increasing strain rate, and the relationship between yield strength and logarithm of strain rate was linear. Considering tile strain-rate-dependent mechanical properties of PE-HD, the Sherwood-Frost constitutive model was used to study the mechanical behaviour of high density polyethylene. Comparison of the model-predicted curves with the experimental ones showed that the Sherwood-Frost model could well predict the mechanical properties of PE-HD.

关 键 词：高密度聚乙烯 SHERWOOD Frost本构模型 应力 应变 单轴拉伸 屈服应力 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]