有机玻璃在宽温度、宽应变率范围压缩性能实验研究  

Experimental study on compressive property of PMMA within wide temperature and wide strain rate range

作　　者：胡文军[1] 陈勇梅[1] 谢若泽[1] 敬华[1] 何鹏[1] HU Wenjun CHEN Yongmei XIE Ruoze JING Hua HE Peng(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《中国测试》2016年第10期9-12,共4页China Measurement & Test

基　　金：国家自然科学基金(11272300)

摘　　要：采用分离式Hopkinson压杆实验装置和材料试验机对有机玻璃(PMMA)进行不同温度和不同应变率的压缩实验研究,获得PMMA在-70~120℃温度范围和10-4/s^103/s应变率范围内应力应变曲线,分析应变率和温度对PMMA屈服应力和屈服应变的影响规律。结果表明:屈服应力随温度降低和应变率升高而增大,屈服应变随温度降低而增加;在不同应变率范围内,屈服应变随应变率增加的变化规律较为复杂。在-70~120℃温度范围和低应变率条件下,屈服应力和应变与温度关系可以用线性方程和带指数函数多项式进行描述,在室温条件和应变率为10-4/s^103/s范围内,屈服应力随对数应变率呈双线性关系增加,而屈服应变与应变率的关系较为复杂。Compression test research on polymethyl methacrylate （PMMA） has been carried out under different temperatures and strain rates by split-Hopkinson compression bar test device and material testing machine, and the stress-strain curves of PMMA within the temperature range of -70-120℃ and strain rate range in 10^-4-10^3/s were obtained and the influence rule of strain rate and temperature on yield stress and yield strain of PMMA was also analyzed. The results showed that the yield stress increases with the decreasing temperature and increasing strain rate and the yield strain increases with the decreasing temperature. Within different strain rate range, the change rule that yield strain increases with the strain rate is complicated. Under the temperature of-70 ℃ to 120 ℃ and low strain rate, the relation of yield stress and strain and temperature can be described by linear equation and exponential function polynomial. Within the range of room temperature and strain rate being 10-4-103/s, the yield stress increases in bilinear relation along with the logarithmic strain rate. Besides, the relation between yield strain and strain rate is relatively complicated.

关 键 词：有机玻璃 应变率 压缩实验 屈服应力 力学性能 

分 类 号：O37[理学—流体力学]