ミクロ-マクロ非連成解析による多結晶金属の加工後降伏強度の評価手法

概要

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We introduce a method of predicting macroscopic yield strength of polycrystalline metals subjected to plastic forming by applying the micro-macro decoupling analysis method. The macroscopic plastic forming problem is assumed to be a three-stage forming process and is simulated with a single finite element in this study. At the same time, a polycrystalline aggregate composed of several crystal grains is adopted as a microstructure and is regarded as a numerical specimen for numerical material tests based on the homogenization theory. After simulating the macro-scale forming process with macroscopic approximate constitutive model, we apply the resulting macroscopic deformation histories to the microstrcutre to obtain the numerical specimen that enables us to evaluate the post-forming yield strengths. By performing the equivalent micro-macro coupling analysis and comparing the results with those by the coupling method, we demonstrate the capability of the proposed method in predicting the anisotropy in the macroscopic yield strength.
2010-06-25