Numerical Analysis of Deformation Band Evolution and Sub-Macroscopic Stress Disorder in FCC Single Crystals

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  • FCC単結晶中の変形帯の発達過程と応力場の準微視的乱れの数値解析
  • FCC タンケッショウチュウ ノ ヘンケイタイ ノ ハッタツ カテイ ト オウ

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Numerical models of face centered cubic single crystals, in which the condition for plastic slip is spacially non-uniform, have been developed. Tensile deformations of the models have been analysed by the finite element method. The evolutions of deformation bands from the initial non-uniformity and the characteristics of disordered stress field caused by non-uniform slip have been discussed. The results are as follows:<BR>(1) non-uniformity in the distribution of the initial dislocation density caused the generation of a kink band even if the non-uniformity is very slight.<BR>(2) a band of secondary slip is formed when the non-uniformity in the distribution of shear strain on the primary slip system reaches a certain value which is supposed to depend on the crystal orientation.<BR>On the basis of the results of disordered stress field analyses, the reason for which the kink band and the band of secondary slip are formed in a specific direction has been discussed.

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