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A critical plane-strain energy density criterion for multiaxial low-cycle fatigue life under non-proportional loading

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A series of multiaxial low-cycle fatigue experiments was performed on 45 steel under non-proportional loading. The present evaluations of multiaxial low-cycle fatigue life were systematically analysed. A combined energy density and critical plane concept is proposed that considers different failure mechanisms for a shear-type failure and a tensile-type failure, and from which different damage parameters for the critical plane-strain energy density are proposed. For tensile-type failures in material 45 steel and shear-type failures in material 42CrMo steel, the new damage parameters permit a good prediction for multiaxial low-cycle fatigue failure under non-proportional loading. The currently used critical plane models are a special and simple form of the new model.

Keywords: damage parameter; fatigue life prediction; multiaxial fatigue; non-proportional loading

Document Type: Research Article

DOI: http://dx.doi.org/10.1046/j.1460-2695.1999.t01-1-00199.x

Affiliations: Department of Chemical Engineering, Tianjin University, Tianjin 300072, P.R. China, 1Zhuzhou Electric Vehicle Works, Zhuzhou 412001, P.R. China

Publication date: August 1, 1999

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