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在机械强度设计中,先以静强度确定出零件初步尺寸。在此基础上,对危险部位和截面(一般是在最高蜂值应力处)进行疲劳强度的校核计算。通常的疲劳强度判据为:计算所得安全系数 n 等于或大于其许用安全系数[n],即n≥[n]。此外,疲劳强度设计的另一内容是对该零部件进行寿命估算,使它满足使用期限的要求。因此这里主要介绍两方面的内容:一是安全系数的计算,一是疲劳寿命的估
In the mechanical strength design, the static strength to determine the initial size of the parts. On this basis, the dangerous parts and cross-section (usually at the highest bee value stress) fatigue strength check calculation. The usual fatigue strength criterion is that the calculated safety factor n is equal to or greater than its allowable safety factor [n], ie n ≧ [n]. In addition, fatigue strength design is another part of the life expectancy of the parts to make it meet the requirements of the service life. So here mainly introduces two aspects: First, the calculation of safety factor, first, fatigue life assessment