Fatigue life analysis and life expectancy design strategy for flexible hinge under random variable amplitude loading

摘要

Aiming at the flexible hinge is often affected by external random variable loading operating noise fluctuation and complex factors, the fatigue degradation or failure is lack of analysis methods and that causes weak link of fatigue life analysis is difficult to find in the engineering practice. This paper introduces fatigue analysis method combines the fatigue of rain flow counting method and Pam Glen palmgren Miner theory. The article uses random load-time history to deal with cyclic loadings by rain flow counting method. Calculate the flexible hinge fatigue damage with the S-N curve in different stress. The fatigue life and the design of the weak link are obtained under random variable loading through simulation with ANSYS. The strategies are given to improve the anti-fatigue for rectangular flexible hinge which improve the deficiencies in the design. This method has instruction and reference value to actual project.