Shear band spacing under bending of Zr-based metallic glass plates
Shear band spacing under bending of Zr-based metallic glass plates
复制标题
DOI：
10.1016/j.actamat.2004.01.034
复制
发表时间：
2004-05-03
期刊：
影响因子：
9.4
通讯作者：
Johnson, WL
中科院分区：
文献类型：
--
作者：
Conner, RD;Li, Y;Johnson, WL
金属玻璃在承受压缩或弯曲载荷时，由于多个剪切带的形成，通常表现出显著的延展性。这种观察到的延展性取决于样品的几何形状;薄板在弯曲时显示出延展性，而相同组成的厚板在类似的载荷下断裂。屈服和断裂的金属玻璃板弯曲的厚度依赖性被认为是负责这些属性的剪切带过程。试验结果表明，剪切带间距和长度尺度与板厚之比为1：10。剪切带偏移量和剪切带间距均随曲率的增大而增大，剪切带偏移量与板厚的平方成正比。当弯曲增加超过屈服时，剪切带间距继续增加，直到应变被几个长剪切带容纳。继续弯曲导致裂纹形成和失效。(C)2004 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
Metallic glasses often exhibit marked ductility when subjected to compressive or bending loads as a result of multiple shear band formation. This observed ductility depends upon sample geometry; thin plates show ductility in bending while thicker plates of the same composition fracture under similar loading. The thickness dependence of yielding and fracture of metallic glass plates subjected to bending is considered in terms of the shear band processes responsible for these properties. Experimental results show that shear band spacing and length scale with the thickness of the plate at a ratio of 1: 10. Both shear band offset and shear band spacing increase with increasing curvature; shear band offset as the square of the plate thickness. As bending is increased beyond yield, shear band spacing continues to increase until the strain is accommodated by a few long shear bands. Continued bending leads to crack formation and failure. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.