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传统的寿命估算方法是名义应力法,这种方法根据构件的名义应力历程、构件的S-N曲线和累积损伤理论估算寿命。这种方法需要做构件的S-N曲线,而且估算的结果常常很不精确。近年来国外发展起一种新的寿命估算方法,这种方法根据构件关键部位的弹塑性分析,将名义应力历程转化为关键部位的局部应力-应变历程,根据局部应力-应变历程和材料的疲劳特性及累积损伤理论进行裂纹形成寿命的估算,称之为局部应力-应变法。这种方法已
The traditional method of life estimation is the nominal stress method, which estimates the life based on the nominal stress history of components, the S-N curves of components and the cumulative damage theory. This method requires the S-N curve of the component, and the result of the estimation is often very inaccurate. In recent years, a new life estimation method has been developed abroad. According to the elastic-plastic analysis of the key parts of the structure, the method converts the nominal stress history into the local stress-strain history of the key parts. According to the local stress-strain history and the fatigue of the material Characteristics and cumulative damage theory to estimate the life of crack formation, called the local stress-strain method. This method has been