Ni基超合金IN738LCの非弾性構成式の開発 : 第2報, 背応力の異方的成長を考慮した統一形構成式モデル

概要

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A new unified constitutive model was proposed in order to describe inelastic deformation behavior of Ni-based superalloy IN 738 LC precisely. In the constitutive model, an internal state variable corresponding to the origin of dynamic recovery of a back stress was introduced into an evolution law of the back stress. Due to this modification, the constitutive model could express a shift of stress-strain hysteresis loops for tensile strain-hold waveforms, which was specific inelastic behavior of the material and was hardly described by conventional unified constitutive models. To check the validity of the constitutive model, numerical simulations were done for various inelastic behavior of IN 738 LC at 850℃. The simulations agreed with experimental results adequately, including the description of the shift of hysteresis loops.
一般社団法人日本機械学会の論文
1999-06-25