扭转条件下过渡圆角半径及径比对圆轴疲劳寿命的影响  

Influence of radius of rounded corner of stepped shafts and radius ratio on fatigue life of shafts subjected to torsion

作　　者：李有堂[1,2] 于立群[2] 

机构地区：[1]兰州理工大学数字制造技术与应用省部共建教育部重点实验室,甘肃兰州730050 [2]兰州理工大学机电工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2008年第5期32-35,共4页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(3ZS061-A25-47)

摘　　要：提出应用局部应力应变法计算疲劳寿命的原理.建立不同圆角半径和径比圆轴的有限元计算模型,利用ANSYS软件计算纯扭转条件下过渡圆角处的局部应力、应变;应用局部应力应变法计算对称循环载荷谱下的疲劳裂纹萌生寿命;绘制寿命随圆角半径和径比变化的曲线图.计算分析结果表明,疲劳裂纹的形成寿命随着过渡圆角半径的变大而增长,随着径比的增大而呈下降趋势,径比越大,过渡圆角半径越小,疲劳裂纹的形成寿命越短.The principle of fatigue life computation was presented on the basis of local stress-strain method and the finite element model of stepped shafts with different radii of rounded corner and radius ratios was set up. The local stress and strain at the rounded corners on the shafts subjected to pure torsional loading were computed by using the software ANSYS. The fatigue crack initiation lives under symmetric cyclic load were determined with the method of local stress-strain approach. The results showed that the fatigue lives increased with the values of the tip radius of the rounded corner and decreased with the values of radius ratio, and the smaller the transition radius was, the shorter the life would be.

关 键 词：疲劳寿命 扭转 圆角半径 径比 有限元法 局部应力应变法 

分 类 号：TH114[机械工程—机械设计及理论]