Fatigue damage rule of ly12cz aluminum alloy under sequential biaxial loading

摘要

A series of biaxial two-level variable amplitude loading tests are conducted on smooth tubular specimens of LY12CZ aluminum alloy.The loading paths of 90°out-of-phase,45°out-of-phase and 45°in-phase are selected.The fatigue damage cumulative rules under two-level step loading of three loading paths are analyzed.A new multiaxial nonlinear fatigue damage cumulative model is proposed.Fatigue lives predicted based on the proposed model are within factors of 2 scatter band.