货车转向架铸件一侧架和摇枕在运行中要承受交变载荷,其可靠性在很大程度上取决于抗疲劳特性的分布状况。这种分布状况反映疲劳破坏过程的统计本质,它和金属的微观及宏观结构的不均匀性有关,在选择经工艺强化钢的牌号时应予以考虑,同时在以统计观点做零件的耐久计算中也应予以考虑。为了进行类似的计算,在已知给定的不同载荷时的寿命分布函数(未知参数达到一定精度)时,可以求得相应于不同的破坏概率所需的疲劳曲线。疲劳破坏过程的统计判断的情况导致对对数正态分布和对按循环寿命得出的试验数据做逼近的 Truck bogie castings A side frame and bolster in the operation to withstand alternating loads, the reliability depends largely on the distribution of anti-fatigue properties. This distribution reflects the statistical nature of the fatigue failure process, which is related to the microscopic and macroscopic structural heterogeneity of the metal. It should be considered when choosing the grades of the process-reinforced steel. In the endurance calculation of the parts Should also be considered. For a similar calculation, the fatigue distribution curve corresponding to different failure probabilities can be obtained when the life distribution function at given given load (unknown parameter reaches a certain accuracy). The statistical judgment of the fatigue failure process leads to approximation of the logarithmic normal distribution and the test data obtained by the cycle life