Ideal shear strain of metals and ceramics
Ideal shear strain of metals and ceramics
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DOI：
10.1103/physrevb.70.104104
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发表时间：
2004-09-01
影响因子：
3.7
通讯作者：
Yip, S
中科院分区：
文献类型：
--
作者：
Ogata, S;Li, J;Yip, S
使用密度泛函理论，我们分析了22个简单的金属和陶瓷的应力-应变响应，以确定最大的剪切应变均匀晶体可以承受，属性，我们建议的名称剪切。金属和共价陶瓷之间存在剪切性能的差距。金属的剪切性还与价电荷局域化和定向成键的程度相关。取决于变形约束，离子固体可以具有比共价固体更大的剪切性。当剪切率用于缩放时，理想剪切强度的Frenkel模型对金属和陶瓷都适用。
Using density functional theory we analyze the stress-strain responses of 22 simple metals and ceramics to determine the maximum shear strain a homogeneous crystal can withstand, a property for which we suggest the name shearability. A shearability gap is found between metals and covalent ceramics. Shearability of metals further correlates with the degree of valence charge localization and directional bonding. Depending on the deformation constraints, ionic solids may possess even larger shearability than covalent solids. The Frenkel model of ideal shear strength works well for both metals and ceramics when shearability is used in the scaling.