疲劳强度的计算疲劳强度的计算.doc

摘要：零件的疲劳强度是一个值得深刻探讨的问题，在众多领域有着至关重要的地位，零件的疲劳强度决定了其疲劳寿命，也就决定了对零件的选择和对这个器件的设计。本论文在参考多方资料，以及在平日学习中积累总结的经验之后，对零件疲劳强度的计算有了一些结论，得出影响导致零件疲劳的原因有破坏应力与循环次数之间量的变化影响，静应力的影响，应力集中的影响，零件绝对尺寸的影响，表面状态与强化的影响等方面。在分析零件疲劳产生原因之后，得出许多关系变化图与计算方法。运用这些计算方法，对零件疲劳极限进行了计算上的确定。并总结出疲劳强度在一些条件下的相关计算方法，如在简单应力状态，复杂应力状态下的不同。对疲劳强度安全系数的确定也进行了一系列分析，最后，尝试建立了疲劳强度的统计模型。 Abstract：The fatigue strength of parts is a worthy of deep discussion, have a vital role in many fields, the fatigue strength of parts determines its fatigue life, also decided on the part of the selection and the device design.This paper in reference to various data, and after the usual study accumulation experience, calculation of the fatigue strength of parts have some conclusion, that caused damage should change between force and the number of cycles of the causes of fatigue parts, the influence of static stress, effect of stress concentration, affects the absolute size, surface state and strengthening effect etc.. After the analysis of fatigue causes, draw many relationship graph and calculation method. Using the calculation method of fatigue limit, determined the calculation. And summarizes the related calculation under some conditions the method of fatigue strength, as in the simple stress state, the complex stress state under the different. Determination of the fatigue strength safety factor is also carried out a series of analysis, finally, try to establish a statistical model of fatigue strength. 关键词：零件 疲劳寿命 疲劳强度 Key word:Spare parts Fatigue life Fatigue strength 目 录 疲劳强度的基本规律 ………………………………………………… 1.1、破坏应力和循环次数之间量的关系……………………………… 1.2、疲劳曲线方程式…………………………………………………… 1.3、静应力对疲劳强度的影响……………………………………………………… 1.4、应力集中对疲劳强度的影响…………………………………………………… 1.5、零件绝对尺寸对疲劳强度的影响……………………………………………… 1.6、表面液态与强化对疲劳强度的影响…………………………………………… 零件疲劳极限的确定 ………………………………………………… 2.1、试验确定…………………………………………………………… 2.2、计算-试验确定 …………………………………………………… 疲劳强度条件 ………………………………………………………… 3.1、简单应力状态……………………………………………………… 3.2、复杂应力状态……………………………………………………… 疲劳强度安全