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Coupling damage and reliability model of low-cycle fatigue and high energy impact based on the local stress–strain approach

Coupling damage and reliability model of low-cycle fatigue and high energy impact based on the local stress–strain approach

作     者:Chen Hongxia Chen Yunxia Yang Zhou 

作者机构:School of Reliability and Systems Engineering Beihang University 

出 版 物:《Chinese Journal of Aeronautics》 (中国航空学报(英文版))

年 卷 期:2014年第27卷第4期

页      面:846-855页

核心收录:

学科分类:08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 080502[工学-材料学] 

基  金:supported by the National Natural Science Foundation of China(No.61104132) 

主  题:Coupling damage Fatigue High-energy impactLow-cycle Local stress-strain Reliability Strain rate 

摘      要:Fatigue induced products generally bear fatigue loads accompanied by impact processes,which reduces their reliable life rapidly. This paper introduces a reliability assessment model based on a local stress–strain approach considering both low-cycle fatigue and high energy impact *** coupling relationships between fatigue and impact are given with effects of an impact process on fatigue damage and effects of fatigue damage on impact performance. The analysis of the former modifies the fatigue parameters and the Manson–Coffin equation for fatigue life based on material theories. On the other hand, the latter proposes the coupling variables and the difference of fracture toughness caused by accumulative fatigue damage. To form an overall reliability model including both fatigue failure and impact failure, a competing risk model is developed. A case study of an actuator cylinder is given to validate this method.

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