A Simple Model for Cyclic Plasticity Based on Activation State of Slip Systems

概要

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This paper proposes a new simple model for cyclic incremental plasticity based on activation states of slip systems describing stable cyclic stress-strain relationship under nonproportional loading. In this model, the magnitude and the direction of incremental plastic strain are estimated by (1+αfnp) and Q, respectively. Here, a is the constant related to the material dependence of additional hardening and fNP the nonproportional factor expressing the severity of nonproportional loading. Q is a second-order tensor describing the activation states of slip systems in polycrystal-line metals and is given by the calculation using a virtual specimen. The model was examined the applicability to the estimation of the stable cyclic stress-strain relationship in extensive non-proportional low cycle fatigue tests for Type 304 stainless steel and 6061 aluminum alloy. The simulated results showed that the model gave a satisfactory estimation of the stable cyclic stress-strain relationship under the complex nonproportional multiaxial loadings for different materials.
福井大学工学部の論文