摘要
利用Instron5544和分离式霍普金森压杆(SHPB)装置对浇注成型的聚氨酯(PU)弹性体进行准静态和动态加载条件下的单轴压缩实验,得到材料的应力应变曲线。从实验曲线可知,PU弹性体为应变率敏感材料,且相较于准静态加载条件,动态载荷应变率效应更加显著。通过对多种超弹性本构方程的对比分析,探讨了应变能密度函数形式与实验曲线形状之间的关系。采用拟合度高且参数较少的"三项式"形式的应变能密度函数分别对各应变率下的实验曲线进行拟合,进而得到了PU弹性体应变率相关的本构模型。
The quasi-static and dynamic uniaxial compression experiments were conducted to casting polyurethane(PU)elastomer by using Instron 5544 and split Hopkinson pressure bar(SHPB)apparatus in this paper.The strain-stress curves of PU elastomer were obtained.The experimental stress-strain curves of the PU elastomer indicated that the material was sensitive to strain rates and that the strain-rate sensitivity was particularly significant in dynamic experiments.The relationship between the form of strain energy density functions and the shape of the experimental curves was analyzed by applying numbers of hyperelastic constitutive equations to describe the mechanical behavior of PU.In addition,the“Three item”model which has the advantages of less parameters and high degree of fitting was adopted to fit the experimental curves under different strain rates.Then,a strain rate dependent constitutive model was proposed to describe the behavior of PU elastomer under low and high strain rates.
作者
刘高冲
金涛
陈圣家
肖革胜
苏步云
树学峰
LIU Gaochong;JIN Tao;CHEN Shengjia;XIAO Gesheng;SU Buyun;SHU Xuefeng(Institute of Applied Mechanics and Biomedical Engineering,Taiyuan University of Technology,Taiyuan 030024)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第A01期315-318,共4页
Materials Reports
基金
国家自然科学基金(11390362)
关键词
聚氨酯弹性体
超弹性
本构模型
应变率
polyurethane elastomer
hyperelasticity
constitutive model
strain rate
