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一引言所谓常规疲劳,从破坏周次来说是指大于10~4～10~5次的疲劳,即高周疲劳;从试验方法来说是指应力控制的那一类疲劳;从设计方法来说,它运用了经典的疲劳设计理论,即利用疲劳极限或Goodman图来进行强度设计,应用P-S-N曲线和线性疲劳累积损伤理论来对零部件作疲劳寿命估计。人们时常从上述三个方面的一个或几个意义上来使用常规疲劳这一术语的。常规疲劳试验的目的,主要是为了测定材料或零部件的疲劳极限和P-S-N曲线。当然,用于疲劳设计的疲劳有效应力集中系数K_f,尺寸系数ε和表面加工
An introduction The so-called conventional fatigue, from the destruction week is more than 10 ~ 4 ~ 10 ~ 5 times the fatigue, that is, high cycle fatigue; from the test method refers to the type of stress control fatigue; from the design approach Said that it uses the classical theory of fatigue design, that is, the use of fatigue limit or Goodman diagram for strength design, application of PSN curve and linear fatigue cumulative damage theory to estimate the fatigue life of parts. People often use the term one or more of the above three aspects of conventional fatigue. The purpose of the conventional fatigue test is primarily to determine the fatigue limit and the P-S-N curve of the material or part. Of course, fatigue effective stress concentration factor for fatigue design K_f, size factor ε and surface finish