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目前的机械设计方法(包括疲劳设计)是依靠“安全系数”来补偿对材料及载荷知识的不足,所得的设计可能比必需的要笨重得多。可靠性设计是减轻重量的一种设计方法,这种设计可应用于不同的领域中,如航天、航空和汽车等的某种结构及零件的设计。 由于在疲劳设计中的很多参数,如载荷、材料强度和零件的几何尺寸,都是具有统计特性的,假设这些参数都为正态分布并彼此独立的。强度及应力两个分布曲线存在有一个重叠面积,它表征了应力超过强度或零件要破坏的情况。 引入正态分布函数的代数及用统计法修正的Goodman图线,作出了疲劳强度的可靠性设计。
Current mechanical design methods (including fatigue design) rely on “safety factors” to compensate for lack of material and load knowledge, and the resulting design may be much more cumbersome than necessary. Reliability Design is a design method to reduce weight. This design can be applied in different fields, such as the design of certain structures and parts in aerospace, aviation and automobiles. Because of the many parameters in fatigue design, such as load, material strength, and part geometry, are statistically significant, assuming that these parameters are normally distributed and independent of each other. There is an area of overlap between the two distribution curves for strength and stress, which characterizes the stress exceeding the strength or the part to be destroyed. Introducing the algebra of normal distribution function and the Goodman plot modified by statistical method, the reliability design of fatigue strength was made.