一、前言为了获得金属材料的准确力学性能,对试验中试样变形的自动测量是极为重要的。要在不同的试验机上获得准确一致的试验数据,必须以相同的塑性变形速度进行试验,或者进行应变控制。这一切都必须使用电子引伸计。利用电子引伸计可以直接绘出足够精确的应变曲线,它在与试验机组成闭环系统时,可以直接进行应变控制。 I. INTRODUCTION In order to obtain the accurate mechanical properties of metal materials, automatic measurement of the deformation of the test specimen is of paramount importance. To obtain accurate and consistent test data on different testing machines, it is necessary to test at the same rate of plastic deformation or to control the strain. All this must use an electronic extensometer. The use of electronic extensometer can be drawn directly enough accurate strain curve, which in the closed loop system with the test machine, you can directly strain control.