K-0628 すべり系の活動状態を考慮した非比例多軸繰返し塑性変形モデル(G03-8 疲労・変形・損傷評価)(G03 材料力学部門一般講演)

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 straining. In this model, the magnitude and the direction of incremental plastic strain are estimated by (1+αf_<NP>) and Q, respectively. Here, α is the constant related to the material dependence of additional hardening and f_NP the nonproportional factor expressing the severity of nonproportional loading. Q is a second-order tensor describing the activation states of slip systems in polycrystalline 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 nonproportional low cycle fatigue tests for SUS 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.
一般社団法人日本機械学会の論文
2001-08-22