Instability Analysis and Free Volume Simulations of Shear Band Directions and Arrangements in Notched Metallic Glasses.
Instability Analysis and Free Volume Simulations of Shear Band Directions and Arrangements in Notched Metallic Glasses.
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DOI：
10.1038/srep34878
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发表时间：
2016-10-10
影响因子：
4.6
通讯作者：
Bei H
中科院分区：
文献类型：
--
作者：
Li W;Gao Y;Bei H
作为提高大块金属玻璃塑性的一种常用方法，几何约束的引入阻止和限制了剪切带的扩展，降低了各剪切带上的塑性应变程度，从而防止或延缓了灾难性破坏，并促进了多剪切带的形成。缺口附近多个剪切带的聚集通常被解释为延性改善的原因。缺口金属玻璃中剪切带排列的实验研究已经广泛开展，但缺乏系统的理论研究。使用不稳定性理论预测的应变局部化和基于自由体积的有限元模拟预测的剪切带的演变，这项工作揭示了各种类别的剪切带安排在双边缺口BMG相对于所施加的应力场的模式混合。从而为有关的实验，特别是各种剪切带与应力状态的关系提供了一个力学解释。
As a commonly used method to enhance the ductility in bulk metallic glasses (BMGs), the introduction of geometric constraints blocks and confines the propagation of the shear bands, reduces the degree of plastic strain on each shear band so that the catastrophic failure is prevented or delayed, and promotes the formation of multiple shear bands. The clustering of multiple shear bands near notches is often interpreted as the reason for improved ductility. Experimental works on the shear band arrangements in notched metallic glasses have been extensively carried out, but a systematic theoretical study is lacking. Using instability theory that predicts the onset of strain localization and the free-volume-based finite element simulations that predict the evolution of shear bands, this work reveals various categories of shear band arrangements in double edge notched BMGs with respect to the mode mixity of the applied stress fields. A mechanistic explanation is thus provided to a number of related experiments and especially the correlation between various types of shear bands and the stress state.
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影响因子：
6
作者：
Hsueh, C. H.;Bei, H.;George, E. P.
通讯作者：
George, E. P.
DOI：
10.1016/0956-7151(94)90403-0
发表时间：
1994-09-01
期刊：
ACTA METALLURGICA ET MATERIALIA
影响因子：
--
作者：
HE, MY;WU, B;SUO, Z
通讯作者：
SUO, Z
DOI：
10.1016/0022-5096(75)90001-0
发表时间：
1975-01-01
影响因子：
5.3
作者：
RUDNICKI, JW;RICE, JR
通讯作者：
RICE, JR
影响因子：
2.5
作者：
Ozbolt, J;Reinhardt, HW
通讯作者：
Reinhardt, HW
影响因子：
4.4
作者：
Hsueh, C. H.;Bei, H.;Becher, P. F.
通讯作者：
Becher, P. F.