A fatigue and low-energy shock-based approach to predict fatigue life

作者：Chen, Hongxia; Chen, Yunxia^*; Yang, Yi

来源：Journal of Mechanical Science and Technology, 2014, 28(10): 3977-3984.

DOI：10.1007/s12206-014-0909-5

• Fatigue
• Shock
• Low energy
• Cumulative damage
• Coupling relationship

A product that is characterized by fatigue-induced failure always suffers from complex fatigue loads, and the damage caused by fatigue loads accumulates with time. The existence of shocks not only directly increases the risk of failure but also affects the magnitude of damage caused by fatigue loads. This study analyzes the reliability of a product when fatigue loads and shocks are both involved. The features of fatigue damage and shock damage are investigated, and the coupling relationship between them is discussed. With assumptions of high cycle fatigue and low-energy shocks, the effect of shocks on fatigue damage is expressed as the degradation of the ultimate strength of the product. An overall reliability model with fatigue and shock failures is developed. Two conditions are considered for the reliability model: shocks with fixed period and shocks with a homogeneous Poisson process. Three important cumulative damage theories are adopted. An engineering case of actuator cylinder is provided to demonstrate the proposed approach.

• 出版日期2014-10
• 单位北京航空航天大学; 中国航天员科研训练中心