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本文指出对于横梁速度恒定的试验机和应变率恒定的试验机如何利用力学试验机的刚性将负荷——时间数据转化为应力与应变。此方法就是将试验机刚性的明确计算值并用于数据处理与从时间——负荷轨迹的初始斜率线测量剩余变形时间这个经常使用的方法相比较,并用这些时间计算应力——应变曲线上的各点,这两种方法的差别很小,除非能确定在一个试验中试验机刚性的变化。当这是可能时——进行试验几乎总能实现其可能性——则此工作中之方法比早期的,近似的方法更佳。其优越性在于数据处理的精度高以及事实上所有数据点的应变率计算是更精确了。
This article points out how to use the stiffness of a mechanical tester to convert the load-time data into stress and strain for a machine with a constant beam speed and a machine with a constant strain rate. This method is to compare the exact calculated rigidity of the tester with the data processing method and the commonly used method of measuring the residual deformation time from the time-the initial slope line of the load trajectory, and use these time to calculate the stress-strain curve At this point, the difference between the two methods is small, unless it is possible to determine the stiffness of the tester during a test. When this is possible—the tests are almost always possible—the methods in this work are better than the earlier, approximate methods. Its advantage lies in the high precision of data processing and the fact that the strain rate calculation of all data points is actually more accurate.