On plastic deformation and fatigue under multiaxial loading |
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Authors: | CH Wang MW Brown |
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Affiliation: | aSchool of Engineering and Technology, Deakin University, Geelong, Vic 3217, Australia;bDepartment of Mechanical and Process Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK |
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Abstract: | This paper presents an experimental and theoretical investigation of deformation and fatigue behaviour under multiaxial random loading. The inelastic stress-strain response under complex loading paths has been predicted using an incremental plasticity model, which incorporates a memory rule to account for the variable-amplitude and non-proportional loading effects. Based on hysteresis strain-hardening behaviour and the history described by the memory effect under multiaxial loading, a mechanics-based cycle counting method has also been proposed for multiaxial random loading. The evaluation of cumulative damage by the cycle counting method combined with Miner's linear rule and a strain-path-dependent fatigue damage parameter is compared with experimental results of two metals under biaxial variable-amplitude loading. |
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