A new path-dependent fatigue damage model for non-proportional multi-axial loading

作者：Mei Jifa; Dong Pingsha^*

来源：International Journal of Fatigue, 2016, 90: 210-221.

DOI：10.1016/j.ijfatigue.2016.05.010

• Multi-axial fatigue
• Multi-axial cycle counting
• Non-proportional loading
• Fatigue damage modeling
• Welded joints

This paper presents a new path-dependent multi-axial fatigue damage model which is formulated based on an incremental form of Moment of Load Path (MLP) on either sigma - root beta tau stress plane or epsilon - root beta(epsilon)gamma strain plane. The resulting MLP-based fatigue damage parameter can be shown to be related to an integral form of strain energy densities contributed by normal and shear deformation and each weighted by a path-dependent function. Then, the MLP-based damage parameter in terms of either equivalent stress range or strain range, in conjunction with path-dependent maximum-range cycle counting procedure (Dong et al., 2010; Wei and Dong, 2010), has been shown effective in correlating a large amount of test data obtained under non-proportional multi-axial loading conditions both for welded joints under stress controlled conditions in high cycle fatigue regime and non-welded components under strain controlled conditions in low-cycle regime.

• 出版日期2016-9