在材料机械性能试验中,往往要用测定的数据求得材料的强度极限、延伸率和断面收缩率。现以圆试棒为例,介绍我们采用的计算尺法,供机械性能试验工作人员参考。本文介绍的方法在计算时都是从实际测得的原始数据出发,只要拉动一次计算尺的内尺,就可报出结果。方法简单,计算迅速,精确度较高。强度计算圆试棒的强度计算公式σ=4P/σd~2 Mechanical properties of materials in the test, often with the measured data to obtain the material strength limit, elongation and reduction of area. Now take the test rod as an example, we introduce the use of the calculation rule for mechanical performance test staff reference. This article describes the method is calculated from the actual measurement of the original data, as long as the ruler to pull the ruler, you can report the results. The method is simple, rapid calculation, high accuracy. Strength calculation round test bar strength calculation formula σ = 4P / σd ~ 2