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FTMP-Based Kink Deformation and Strengthening Mechanisms for Mille-Feuille Structures

机译：用于Mille-Feuille结构的基于FTMP的扭结变形和强化机制

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摘要

Kink-strengthening for mille-feuille structures has attracted many attentions in recent years. This study aims at identifying the kink formation/strengthening mechanisms via numerical reproductions of emerging kink-like morphologies based on FTMP (Field Theory of Multiscale Plasticity)-incorporated FE simulations, considering the Rank1 connection, where the incompatibility-based relevant underlying microscopic degrees of freedom for kinking are introduced. The targeted phenomena here include an experimentally-observed unique feature recently reported based on the combined ND-AE (neutron diffraction - acoustic emission) technique, i.e., scale-free-like energy release before (precursor) and during kink formations. This study uses a Mg single crystal model with alternatingly aligned soft and hard layers in parallel to the basal plane under c-axis plane-strain compression, where the soft/hard regions are controlled by the values of the hardening ratio. Also, we assume that the kink mode is only active, while the basal, prismatic and pyramidal slip and the twin systems are not operative associated with the layered structure. From the simulated results, we confirm kink-like morphologies and the attendant significant misorientation in the basal plane angles. Also, the simulated results are demonstrated to exhibit power-law type distributions in the strain energy fluctuation from the early stage of deformation even before the massive emergence of kink-like regions, which are analogous to the above-mentioned ND-AE observations.
机译：近年来，对Mille-Feuille Structures的扭结加强了很多关注。本研究旨在通过基于FTMP（MultiScale可塑性的场地理论）的新兴扭结形态的数值繁殖来鉴定Kink形成/强化机制 - 考虑到Rank1连接，其中基于不相容的相关潜在的显微镜度介绍了扭结自由。这里的目标现象包括最近基于组合的ND-AE（中子衍射 - 声发射）技术，即（前体）和在扭结形成期间的无垢的能量释放的实验观察到的独特特征。该研究使用MG单晶模型与C轴平面 - 应变压缩下的基底平面平行交替对齐的软和硬层，其中软/硬区域由硬化比的值控制。此外，我们假设扭结模式仅是有效的，而基础，棱柱形和金字塔滑动滑动和双系统则与分层结构无关。从模拟结果来看，我们确认像扭结形态，以及在基础平面角度的伴侣显着的杂乱。而且，甚至在突出的扭结区域大量出现之前，甚至在扭结的区域的巨大出现之前，甚至在扭结的突出的区域的早期阶段表明仿真结果的幂律型分布。类似于上述ND-AE观察。

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