一、问题的提出安全系数是机械设计中普遍遇到的一个问题,用它来弥补对材料的均匀性,载荷或应力计算的准确性和另件的重要性等不确定因素的影响。在传统的设计中,通常用计算安全系数n=σ/s大于或等于许用安全系数[n],即 n≥[n](1)的强度条件式来保证所设计的另部件能安全可靠地运行。式中σ、s分别为另件材料的 First, the issue raised Safety factor is a common problem encountered in mechanical design, use it to make up for the material uniformity, load or stress calculation accuracy and the importance of other components and other uncertainties. In the traditional design, the safety factor n = σ / s is usually greater than or equal to the allowable safety factor [n], that is, the condition of n ≥ [n] (1) Run. Where σ, s, respectively, the other pieces of material