Collective Behavior of Grains on Deformation of Single-Phase Polycrystalline Metals

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  • 単相多結晶金属材料の変形における結晶粒集団挙動
  • タンソウ タケッショウ キンゾク ザイリョウ ノ ヘンケイ ニ オケル ケッショウリュウ シュウダン キョドウ

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Abstract

This paper extensively investigates the collective effects of number of composing grains on meso- and macroscopic plastic deformation characteristics of polycrystalline metals beyond the averaged response. A series of systematically designed finite element analyses based on polycrystal-line models with a common fixed-orientation region surrounded by different numbers of grains is made assuming plane strain two-slip systems. Stress supporting structure (SSS) and the dual flow carrying structure (FCS) are formed as a result of the collective deformation of the grains causing large fluctuation in the grain-wise stress-strain response, which are macroscopically invisible. These meso-scopically extended structures produce “remote effects” where the stress-strain response of a grain in the common region is affected not only by the immediate neighbors but also by the grains located in the distances. The affected region for the remote effect is identified to be containing about 400 grains within the present model. Also clarified is an aspect of the polycrystalline plasticity that the stress and strain fluctuations are mainly attributed to the hydrostatic component and deviatoric component, respectively, on which the duality between SSS and FCS is grounded.

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