基于疲劳强度衰减模型的S-N曲线测定方法  

Method to Determine S-N Curve by Modeling of Strength Decrease under Fatigue Loading

作　　者：卢曦[1] 郑松林[1] 褚超美[1] 

机构地区：[1]上海理工大学机械工程学院

出　　处：《农业机械学报》2007年第7期152-155,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(项目编号:50375101);上海市教委科研项目(项目编号:06ZZ35;07ZZ86)

摘　　要：基于经验的疲劳强度衰减模型,提出了一种测定材料和结构的S-N曲线简易方法,同时可以确定材料和结构的临界载荷。该方法通过单点应力下的疲劳试验和静强度测定,可以获得原来至少需要两级应力试验才能得到的材料和结构的疲劳曲线。用不同材料的疲劳试验进行了S-N曲线测定和验证,结果表明,该方法能够准确而且快捷地测定S-N曲线和临界载荷,减少了疲劳试验费用和试验工作量。A simple method for measuring S - N curve and fatigue limit of a material or a machine part was detailed by a experiential fatigue strength decreasing model in this paper. According to experimental fatigue life of one point stress and static strength, the S - N curve of a material or a machine part was calculated by fatigue strength decreasing model. This new measurement method was validated with different kinds of parts. Upon strength decreasing model, the S -N curve and critical load of two materials were acquired with much less samples than before. The results showed that fatigue strength decreasing model and S - N curve measurement method were feasible and usable.

关 键 词：S-N曲线 测定方法 疲劳强度 衰减模型 

分 类 号：TG115.5[金属学及工艺—物理冶金] O346.2[金属学及工艺—金属学]