论文标题
回火FCC微柱的机械响应：欧拉的可塑性方法
Tempering the mechanical response of FCC micro-pillars: an Eulerian plasticity approach
论文作者
论文摘要
压缩下几乎纯纯的单晶微柱的机械响应表现出高度局部的行为，可能会危害样品的结构稳定性。最近的实验表明，晶体的机械响应对样品中猝灭疾病的存在和晶体方向非常敏感。在这项工作中，我们研究了使用FE框架中使用非常简单的Eulerian可塑性模型，研究了疾病和晶体方向对2D FCC晶体具有三个活跃滑行平面的较大应变响应的影响。我们对清洁晶体支柱的数值和理论结果表明，单个平面或许多滑行平面可以根据晶体方向而被激活。虽然在前一种情况下，变形是局部的，导致延性破裂，但在后者中，发生了活跃平面之间的复杂相互作用，从而导致更均匀的变形。当晶体内部设计不均匀性时，可以避免应变定位，或者由于多个滑动系统的激活而改变了晶体方向，从而导致滑动系统分布的“拼布”。
The mechanical response of almost pure single-crystal micro-pillars under compression exhibits a highly localized behavior that can endanger the structural stability of a sample. Recent experiments revealed that the mechanical response of a crystal is very sensitive to both the presence of a quenched disorder in the sample and the orientation of the crystal. In this work, we study the influence of disorder and crystal orientation on the large strain response of a 2D FCC crystal with three active glide planes using a very simple Eulerian plasticity model in the FE framework. Our numerical and theoretical results on clean crystal pillars suggest that a single plane or many gliding planes can be activated depending on the crystal orientation. While in the former case, the deformation is localized, leading to ductile rupture, in the latter, a complex interplay between active planes takes place, resulting in a more uniform deformation. The strain-localization can be avoided when inhomogeneities are engineered inside the crystal, or the crystal orientation is altered because of the activation of multiple slip systems, resulting in a "patchwork" of the distribution of the slip systems.
