尽管对疲劳进行了广泛的研究,但这种破坏的机理仍不很清楚。因此,防止疲劳破坏的设计常常是不精确的和困难的。机械零件和结构的抗疲劳强度,可借助数学模型用解析方法计算,也可用样品由试验确定,或二者同时采用。用各种样品做疲劳试验虽很理想,但由于费用受限制,或由于设计时得不到元件,而常常是不可能的。在这种情况下,必须依靠解析的方法。 Despite the extensive study of fatigue, the mechanism of such damage remains poorly understood. Therefore, designs that prevent fatigue damage are often imprecise and difficult. Fatigue strength of mechanical parts and structures can be calculated using analytical methods using mathematical models, samples can also be used to determine the test, or both at the same time. Fatigue tests with various samples are ideal, but are often impossible due to cost constraints or lack of access to components at design time. In this case, we must rely on analytical methods.