Strain Avalanches in Microsized Single Crystals:Avalanche Size Predicted by a Continuum Crystal Plasticity Model  

作　　者：张旭 张香成 李倩 尚福林 

机构地区：[1]National Center for International Joint Research of Micro-nano Moulding Technology,School of Mechanics and Engineering Science,Zhengzhou University [2]State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace,Xi'an Jiaotong University

出　　处：《Chinese Physics Letters》2016年第10期99-102,共4页中国物理快报（英文版）

基　　金：Supported by the China Postdoctoral Science Foundation under Grant No 2015M572118;the Outstanding Young Talent Research Fund of Zhengzhou University under Grant No 1521327001;the National Natural Science Foundation of China under Grant No 51405452

摘　　要：Plastic deformation of small crystals occurs by power-law distributed strain avalanches whose universality is still debated. In this work we introduce a continuum crystal plasticity model for the deformation of microsized single crystals, which is able to reproduce the main experimental observations such as ttow intermittency and statistics of strain avalanches. We report exact predictions for scaling exponents and scaling functions associated with random distribution of avalanche sizes. In this way, the developed model provides a routine for a quantitative characterization of the statistical aspects of strain avalanches in microsized single crystals.Plastic deformation of small crystals occurs by power-law distributed strain avalanches whose universality is still debated. In this work we introduce a continuum crystal plasticity model for the deformation of microsized single crystals, which is able to reproduce the main experimental observations such as ttow intermittency and statistics of strain avalanches. We report exact predictions for scaling exponents and scaling functions associated with random distribution of avalanche sizes. In this way, the developed model provides a routine for a quantitative characterization of the statistical aspects of strain avalanches in microsized single crystals.

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分 类 号：O344[理学—固体力学]