机械结构疲劳强度的研究分析与应用  

Research Analysis and Application of Mechanical Structure Fatigue Strength

作　　者：左亚军 李金强 程祖意 Zuo Yajun;Li Jinqiang;Cheng Zuyi(Dongguan Shenpeng Electronics Co.,Ltd.,Dongguang,Guangdong 523583,China)

机构地区：[1]东莞市深鹏电子有限公司,广东东莞523583

出　　处：《机电工程技术》2023年第4期270-274,共5页Mechanical & Electrical Engineering Technology

摘　　要：机械结构类的产品在长期使用过程中,部分零部件会承受各种交变应力,需进行疲劳强度校核,而国内尚无完整的疲劳强度计算校核规范指引。基于疲劳强度的基本理论,详细解释了疲劳强度的基本概念、应力类型和S-N疲劳曲线的应用规则,并分析得出疲劳极限应力图中斜率k与循环应力特征r之间的关系,以及古德曼、修正古德曼、戈倍尔和索德伯格4大平均应力疲劳曲线的理论计算及其应用,诠释了真实应力和工程应力的含义及两者之间的区别,并综合分析疲劳强度的校核规则和要求,推导计算出无限寿命设计疲劳安全率的计算公式,结合国内外研究文献给出无限寿命设计的疲劳安全率判定标准,得出了一种有效的疲劳强度计算理论方法,为机械结构的疲劳强度校核提供了一种有效而准确的理论计算依据。In the long-term use of most mechanical structure products,some parts will bear various alternating stresses and need to be checked for fatigue strength.In view of the fact that domestic literature has not yet formed a complete standard guidance for fatigue strength calculation and verification,based on the basic theory of fatigue strength,the basic concept of fatigue strength,stress types and application rules of S-N fatigue curve was explained in detail.The relationship between the slope k and the cyclic stress characteristic r in the fatigue limit stress diagram,and the theoretical calculation and application of the four average stress fatigue curves of Goodman,modified Goodman,Goebbels and Soderberg were analyzed and obtained.The meaning of real stress and engineering stress and the difference between them were explained.The checking rules and requirements of fatigue strength were comprehensively analyzed,and the calculation formula for the design fatigue safety rate of infinite life was derived.Based on the research literature at home and abroad,the criteria for determining the fatigue safety rate of infinite life design were given,and an effective theoretical method for calculating the fatigue strength was obtained,which provided an effective and accurate theoretical basis for checking the fatigue strength of mechanical structures.

关 键 词：疲劳强度 古德曼理论 真实应力 疲劳安全率 

分 类 号：TH123[机械工程—机械设计及理论]