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首页> 外文期刊>Journal de Physique, IV: Proceedings of International Conference >Identification through mesoscopic simulations of macroscopic parameters of physically based constitutive equations for the plastic behaviour of fcc single crystals
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Identification through mesoscopic simulations of macroscopic parameters of physically based constitutive equations for the plastic behaviour of fcc single crystals

机译：通过介观模拟识别FCC单晶塑性行为的基于物理的本构方程的宏观参数

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摘要

The objective of this work is to derive the parameters of macroscopic constitutive equations for the plasticity of fcc single crystals with the help of simulations performed at a dislocation level. The macroscopic model is based on the leading physical mechanisms which are involved in the plastic deformation. The three involved constitutive laws use the total dislocation densities on each glide system as fundamental variables. Those three expressions are derived from physical processes governing the behaviour of a single dislocation and adapted to be used at the macroscopic scale. Literature results could be widely used for the identification of the material parameters for different fcc materials but some of the parameters are mean values and must be seen as phenomenological parameters so that a good way to determine such values consists to sue a numerical tool where each dislocation is individually simulated in a three dimensional network. Such a tool works at a mesoscopic scale (typically several microns) and deals with dislocations discretized into pure screw and edge segments. It includes all the well-known elementary events governing the dislocation motion such as the line tension effect, the Frank-Read multiplication mechanisms, the cross-slip events and the junction formations. The cross-analysis of several specific mesoscopic simulations allows to determinate the values of some macroscopic parameters and also to check the validity of both models.
机译：这项工作的目的是借助在位错水平上进行的模拟，得出fcc单晶可塑性的宏观本构方程的参数。宏观模型基于涉及塑性变形的主要物理机制。这三个涉及的本构定律使用每个滑行系统上的总位错密度作为基本变量。这三个表达式是从控制单个位错的行为的物理过程派生而来的，适用于宏观范围。文献结果可广泛用于鉴定不同fcc材料的材料参数，但其中一些参数是平均值，必须视为现象学参数，因此确定此类值的一种好方法是在每个位错处使用数字工具进行起诉。在三维网络中单独进行仿真。这样的工具以介观尺度（通常为几微米）工作，并处理离散为纯螺钉和边缘段的位错。它包括控制位错运动的所有众所周知的基本事件，例如线张力效应，Frank-Read乘法机制，交叉滑移事件和结形成。对几种特定介观模拟的交叉分析可以确定某些宏观参数的值，还可以检查两个模型的有效性。

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