论文标题
Al单晶的应变控制离散脱位可塑性中的雪崩和速率效应
Avalanches and rate effects in strain-controlled discrete dislocation plasticity of Al single crystals
论文作者
论文摘要
三维离散脱位动力学模拟用于研究面部中心铝单晶的应变控制的塑性变形。在描述了平均应力 - 应变曲线的速率和尺寸依赖性之后，我们研究了幂律分布的应变爆发和平均雪崩形状，并找到了所有强加的应变率和系统尺寸的通用幂律指数$τ\约1.0 $，表征事件大小和持续时间。我们讨论了结果对加载速率的依赖性，并将其与先前关于离散位错的应变二维系统以及铝单晶体的准应力控制负载的研究进行了比较。
Three-dimensional discrete dislocation dynamics simulations are used to study strain-controlled plastic deformation of face-centered cubic aluminium single crystals. After describing the rate and size dependence of the average stress-strain curves, we study the power-law distributed strain bursts and the average avalanche shapes, and find a universal power-law exponent $τ\approx 1.0$ for all imposed strain rates and system sizes, characterizing both the event sizes and their durations. We discuss the dependence of our results on loading rate and compare these with previous studies of strain-controlled two-dimensional systems of discrete dislocations as well as of quasistatic stress-controlled loading of aluminium single crystals.
