Fracture Diodes: Directional Asymmetry of Fracture Toughness
Fracture Diodes: Directional Asymmetry of Fracture Toughness
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断裂二极管：断裂韧性的方向不对称性
DOI：
10.1103/physrevlett.126.025503
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发表时间：
2021
影响因子：
8.6
通讯作者：
Bhattacharya, K.
中科院分区：
文献类型：
--
作者：
Brodnik, N. R.;Brach, S.;Long, C. M.;Ravichandran, G.;Bourdin, B.;Faber, K. T.;Bhattacharya, K.
韧性描述了材料抵抗断裂或裂纹扩展的能力。文中证明了材料的断裂韧性可以是不对称的，即介质对从右向左扩展的裂纹的阻力可以与从左向右扩展的裂纹的阻力显著不同。这种不对称性在天然材料中是未知的，但我们表明，通过适当的微结构控制，它可以构建成人造材料。这为控制裂纹路径和方向铺平了道路，在这种情况下，可以通过预先设计的路径引导断裂--当无法避免时--以最大限度地减少关键部件的损失。
Toughness describes the ability of a material to resist fracture or crack propagation. It is demonstrated here that fracture toughness of a material can be asymmetric, i.e., the resistance of a medium to a crack propagating from right to left can be significantly different from that to a crack propagating from left to right. Such asymmetry is unknown in natural materials, but we show that it can be built into artificial materials through the proper control of microstructure. This paves the way for control of crack paths and direction, where fracture—when unavoidable—can be guided through predesigned paths to minimize loss of critical components.