引言到目前为止,疲劳的机理和基本理论(包括累积损伤理论、裂纹扩展理论、剩余强度理论等)仍然没有得到解决,主要是靠实验来解决问题。但是,进行疲劳试验,存在许多实际的问题。首先,影响疲劳强度的因素很多,比如试件的形状和尺寸、试件表面状况、应力集中、热处 Introduction So far, the mechanism of fatigue and basic theory (including cumulative damage theory, crack growth theory, residual strength theory, etc.) are still not resolved, mainly by experiment to solve the problem. However, there are many practical problems with performing fatigue tests. First of all, many factors affect the fatigue strength, such as the shape and size of the specimen, the specimen surface conditions, stress concentration, heat