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首页> 外文会议>IUTAM Symposium on Multiscale Modeling and Characterization of Elastic-Inelastic Behavior of Engineering Materials; 20021020-20021025; Marrakech; MA >DISLOCATION-BASED LENGTH-SCALES IN CRYSTAL PLASTICITY: EXPERIMENTS AND MODELING
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DISLOCATION-BASED LENGTH-SCALES IN CRYSTAL PLASTICITY: EXPERIMENTS AND MODELING

机译：晶体塑性中基于位移的长度尺度：实验与建模

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摘要

Considered is a dislocation-based plasticity model that includes both temperature- and strain-rate effects, and heavily draws from a body of experimental data on various metals over broad ranges of strain rates, from quasi-static to 10~4/s and greater, and temperatures from 77 to 1,300K and greater. In this model, the role of the strain gradient is embedded in the nature of the dislocations, their density and distribution, and the manner by which they produce slip in crystal plasticity and affect the overall flow stress. The model includes length scales that are directly related to the dislocation densities and hence change with temperature and the strain-rate histories. The model can be used to calculate the force-deformation relations at micron to continuum dimensions. For plastic deformation of small polycrystalline samples involving only a few grains, geometric and textural incompatibilities will most likely manifest themselves through a size effect, and may affect the overall materials' resistance to deformation (flow stress). This size effect is distinguished from the length scales in plasticity, and the size effect is viewed as a problem-dependent phenomenon. For a few interacting crystals, the proposed model of slip-induced crystal plasticity should adequately account for any such size effects
机译：考虑的是基于位错的可塑性模型，该模型同时包括温度和应变率效应，并且大量借鉴了各种金属的实验数据，涉及各种金属，应变率范围从准静态到10〜4 / s甚至更高。 ，温度从77到1300K或更高。在该模型中，应变梯度的作用嵌入在位错的性质，其密度和分布以及它们在晶体可塑性中产生滑动并影响整体流动应力的方式。该模型包括与位错密度直接相关的长度尺度，并因此随温度和应变率历史而变化。该模型可用于计算微米到连续尺寸之间的力-变形关系。对于仅包含几个晶粒的小型多晶样品的塑性变形，几何和结构上的不兼容性最有可能通过尺寸效应表现出来，并可能影响整体材料的抗变形能力（流动应力）。这种尺寸效应与可塑性的长度标度不同，并且尺寸效应被视为与问题相关的现象。对于一些相互作用的晶体，建议的滑移诱导晶体可塑性模型应充分考虑任何此类尺寸效应

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