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(一) 本文介绍金属材料在常温下应变循环加载的试验方法,对实际工程构件使用的一种中碳钢材料进行了七组不同应变控制的循环加载试验,作出循环加载下的应力应变曲线(σ—ε曲线),及应变寿命曲线(ε—N曲线),为估算构件的疲劳寿命提供了数据。(二) 鉴于日本岛津DSS系列试验机在我国已有不下十余台之多,而该机又是测试金属材料应变疲劳性能的一种常用设备,我们发现如用该机使用的标准试件的标距计算应变值有较大误差。为此曾采用两种方法对应变值进行标定。(三) 试图对正态母体平均值μ的区间作一估算。
(1) This paper introduces the test method of strain loading of metal materials at room temperature. Seven kinds of cyclic loading tests are conducted on a kind of medium carbon steel used in the actual engineering components under different strain control to make the stress-strain curve under cyclic loading σ-ε curve), and strain life curve (ε-N curve), which provide data for estimating the fatigue life of the member. (B) As Japan DSJ Series DSS testing machine in our country has been no less than ten as much as the machine is to test the strain fatigue properties of metal materials, a commonly used equipment, we found that if the machine used in the standard test pieces The gauge length of the calculated value of the larger error. For this reason, two methods have been used to calibrate the strain values. (C) trying to make an estimate of the range of the average of the normal parent μ.