测量聚合物在高应变率下力学性质的实验系统

Experimental System for Measuring the Mechanical Properties of Polymer Under High Strain Rate

本文介绍了一种用于测量材料在高应变率下单轴应力─应变性能的实验测量系统：落重与高速摄影实验系统。该系统在现有的落重装置的基础上，增加了高速摄影和应力过程的同时测量，使得在一次实验中可同时取到应力应变数据。从而避免了这类实验中常用的变形过程中体积不变的假设。通过高速实验提供的实验照片，我们还可以观察到聚合物在高应变率下从变形到断裂的发展过程。

This Paper describes a technique developed to measure the uniaxial compres-sive stress-strain properties of polymers at the strain rate appropriate to ballistic and impactevents over time scales of tens of microseconds using a Dropwe ight-Camera system. The in -strument constructed represents a novel development of existing equipment types. The re-sults obtained from compression testing give stress and strain measurements at strain rates ofup to 103s-1 and over a temperature range of 20-200℃. The stress and strain can be inde-pendently obtained simultaneously. This dropweight -camera system has the capability ofproviding direct visualisation simultaneously with stress information of the processes occur-ring during the deformation and fracture of materials．