不同结构表面状态下应变⁃寿命曲线的修正方法  

MODIFICATION METHOD OF STRAIN⁃LIFE CURVES UNDER DIFFERENT SURFACE CONDITIONS OF COMPONENTS

作　　者：段恒 刘庞轮 蒋炳炎 折世强 娄锐 DUAN Heng;LIU PangLun;JIANG BingYan;SHE ShiQiang;LOU Rui(Engineering Technology Research Center,AVIC Landing Gear Advanced Manufacturing Corporation,Ltd.,Changsha 410200,China;State Key Laboratory of High-Performance Complex Manufacturing,College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中航飞机起落架有限责任公司工程技术研究中心,长沙410200 [2]中南大学机电工程学院高性能复杂制造国家重点实验室,长沙410200

出　　处：《机械强度》2022年第6期1455-1460,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51205166)资助。

摘　　要：从起落架疲劳寿命预测的实际问题出发,研究包含表面处理的起落架零件疲劳寿命的预测模型。介绍了传统局部应力⁃应变法的计算过程,系统阐述了局部应力⁃应变法对疲劳寿命预测的影响因素;实际工程研究表明,使用局部应力应变法预测起落架疲劳寿命的主要因素是表面处理和表面粗糙度;通过修正应变⁃寿命曲线,提出了一种起落架零件疲劳寿命预测模型。2个算例表明:预测结果与试验结果吻合较好,给出的不同结构表面状态下应变⁃寿命曲线的修正方法是合理的。Based on the practical problem of fatigue life prediction of landing gear,the fatigue life prediction model of landing gear components with surface treatment was studied.The calculation process of the traditional local stress⁃strain method was introduced,and the factors that affect the local stress⁃strain method for fatigue life prediction were systematically explained;The actual engineering research shows that the main factors for predicting the fatigue life of landing gear by using the local stress⁃strain method are surface treatment and surface roughness.By modifying the strain⁃life curve,a model for predicting the fatigue life of landing gear components is proposed.The two calculation examples show that the predicted results are in good agreement with the experimental results,and the proposed method for revising the strain⁃life curves under different surface conditions is reasonable.

关 键 词：起落架 局部应力应变法 应变寿命曲线 寿命预测 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]