Multiaxial low‐cycle fatigue life evaluation under different non‐proportional loading paths |
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| Authors: | W L Qu E N Zhao Q Zhou Y‐L Pi |
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| Affiliation: | 1. Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan, China;2. School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW, Australia |
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| Abstract: | This paper presents analytical and experimental investigations for fatigue lives of structures under uniaxial, torsional, multiaxial proportional, and non‐proportional loading conditions. It is known that the rotation of principal stress/strain axes and material additional hardening due to non‐proportionality of cycle loading are the 2 main causes resulting in shorter fatigue lives compared with those under proportional loading. This paper treats these 2 causes as independent factors influencing multiaxial fatigue damage and proposes a new non‐proportional influencing parameter to consider their combined effects on the fatigue lives of structures. A critical plane model for multiaxial fatigue lives prediction is also proposed by using the proposed non‐proportional influencing factor to modify the Fatemi‐Socie model. The comparison between experiment results and theoretical evaluation shows that the proposed model can effectively predict the fatigue life due to multiaxial non‐proportional loading. |
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| Keywords: | critical plane parameter life prediction loading path multiaxial fatigue non‐proportional |
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