Glassy features of crystal plasticity

Glassy features of crystal plasticity
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晶体可塑性的玻璃特征

DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
L. Laurson
L. Laurson
中科院分区:
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文献类型:
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作者:
Arttu Lehtinen;G. Costantini;M. Alava;S. Zapperi;L. Laurson

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晶体的塑性是由于位错的雪崩运动引起的形变爆发而发生的。在这里,我们进行了广泛的数值模拟的三维位错动力学模型下准静态应力控制加载。我们的研究结果表明,雪崩是幂律分布,并显示特殊的应力和样本大小的依赖性:平均雪崩的大小与所施加的应力呈指数增长,和滑移量随系统的大小。这些结果表明,在结晶材料的间歇变形过程中表现出类似于玻璃体系,而不是从一个非平衡相变临界点起源的扩展的临界相。
Crystal plasticity occurs by deformation bursts due to the avalanchelike motion of dislocations. Here we perform extensive numerical simulations of a three-dimensional dislocation dynamics model under quasistatic stress-controlled loading. Our results show that avalanches are power-law distributed and display peculiar stress and sample size dependence: The average avalanche size grows exponentially with the applied stress, and the amount of slip increases with the system size. These results suggest that intermittent deformation processes in crystalline materials exhibit an extended critical-like phase in analogy to glassy systems instead of originating from a nonequilibrium phase transition critical point.
DOI: 10.1088/1742-5468/2015/08/p08009
发表时间: 2015-08
期刊: Journal of Statistical Mechanics: Theory and Experiment
影响因子: --
作者:
O. Kapetanou;D. Weygand;M. Zaiser
通讯作者: O. Kapetanou;D. Weygand;M. Zaiser
DOI: 10.1126/science.1143719
发表时间: 2007-10-12
期刊: SCIENCE
影响因子: 56.9
作者:
Csikor, Ferenc F.;Motz, Christian;Zapperi, Stefano
通讯作者: Zapperi, Stefano