论文标题
揭示剪切带活性的起源和多物晶型构建材料中的边界加强
Revealing the origins of shear band activity and boundary strengthening in polygrain-like architected materials
论文作者
论文摘要
关于成功使用晶界加强晶体边界的最新报告，以设计极耐受损害的构建材料（即元晶格），需要基本研究才能理解负责元元晶体的强化和高性能的基本机制。这种理解将使发展高性能和智能架构材料具有更大的信心和控制。在这项研究中，首先分析了单晶样元结晶中的晶格支撑杆的屈曲，以揭示其在剪切条带活动中的作用。还确定了单个定向元结晶的剪切条带系统，为预测和控制多元Golyglain样元晶格的剪切行为提供了坚实的基础。在元结晶中，边界引起的强化效应与边界类型和相干性有关，因为它们控制了跨元边界的剪切带的传播。这项研究中获得的见解在开发具有强大能力控制机械强度和损伤路径的高强度构造材料方面提供了重要的知识。
A recent report on successful employment of the grain boundary strengthening to design extraordinarily damage-tolerant architected materials (i.e. meta-crystals) necessitates fundamental studies to understand the underlying mechanisms responsible for the toughening and high performance of meta-crystals. Such understanding will enable greater confidence and control in developing high performing and smart architected materials. In this study, buckling of lattice struts in single crystal-like meta-crystals was firstly analysed to reveal its role in shear band activities. Shear band systems of singly oriented meta-crystals were also identified to provide a solid basis for predicting and controlling the shearing behaviour in polygrain-like meta-crystals. The boundary-induced strengthening effects in meta-crystals was found to relate to the boundary type and coherency as they govern the transmission of shear bands across meta-grain boundaries. The obtained insights in this study provide crucial knowledge in developing high strength architected materials with great capacity in controlling the mechanical strength and damage path.
