An improved manson-halford model for multi-level nonlinear fatigue life prediction

• Published in: International journal of fatigue Vol. 151; p. 106393
• Main Authors: Gao, Kai, Liu, Gang, Tang, Wei
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.10.2021; Elsevier BV
• Subjects: Damage assessment; Fatigue damage accumulation; Fatigue failure; Fatigue life; Life prediction; Load interaction effect; Load sequence effect; Manson-Halford model; Materials fatigue; Life prediction; Load interaction effect; Load sequence effect; Fatigue damage accumulation; Manson-Halford model
• ISSN: 0142-1123; 1879-3452
• DOI: 10.1016/j.ijfatigue.2021.106393

•A new nonlinear fatigue damage model is proposed based on Manson-Halford model.•New model considers the load interaction effect by the ratio of stress amplitude.•Fatigue life prediction of new model is highest than exiting modified M−H model. The Manson-Halford (M−H) nonlinear fatigue damage model is widely used for fatigue damage analysis. It, however, does not consider the load interaction effect. This paper presents an improved M−H model with a load interaction factor defined as the ratio of the first and second stress levels. The characteristic exponent of the M−H model is modified by multiplying the load interaction factor and fatigue life ratio. The characteristic exponent can consider the load interaction effect and the load sequence effect under multi-level loading. Experimental data from five materials under two-level and multi-level stress loadings verify the accuracy of the proposed model.