Modeling of non-proportional multiaxial fatigue under synchronous and asynchronous sinusoidal loading conditions

Abstract

Multi-axial asynchronous loading presents a unique challenge in fatigue analysis of structural components. A comprehensive investigation is carried out into asynchronous multi-axial fatigue through the framework of path dependent maximum range cycle counting methods (PDMR). Through the investigation two key aspects of asynchronous loading: 1) Unclear cycle definition, and 2) Non-proportionality across different frequency ratios are addressed. The PDMR framework enables a uniform cycle definition and superior correlation of synchronous and asynchronous experimental data. Systematic analysis across a various asynchronous loading is carried out to provide insight into the damage they cause.