On the dynamic failure mechanism of Vit-1 bulk metallic glass: Coupling effects of pre-made damage and strain rate

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-11-08 DOI:10.1016/j.msea.2024.147522

Yang Han , Zejian Xu , P.J. Tan , Mengyu Su , Jianfei Li , Fenglei Huang

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引用次数: 0

Abstract

To clarify the two distinct effects and the underlying physical mechanisms of pre-made damage on the failure strength of bulk metallic glass (BMG), i.e. strengthening or weakening, the influence of axial pre-compression on the dynamic failure of Vit-1 BMG are investigated experimentally. Quasi-static and dynamic compression tests were conducted on pre-compressed BMG specimens for a wide range of nominal strain rates between 0.001 s⁻¹ to 6000 s⁻¹. The focus is on the coupled effects of pre-compression and strain rate on the dynamic failure stress. Two contrasting mechanisms were identified that influence how the pre-made shear bands affect the propagation of cracks under different strain rates. It will be shown that the dynamic failure stress exhibits a transition from strengthening to knockdown with increasing strain rate; and, that the extent of these strengthening and knockdown effects depends on the pre-compression strain level. Finally, a failure model that captures the effects of both strain rate and pre-made damage is proposed.

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Vit-1 块状金属玻璃的动态破坏机理：预制损伤和应变速率的耦合效应

为了阐明预制损伤对块状金属玻璃（BMG）失效强度的两种不同影响及其基本物理机制，即增强还是削弱，我们通过实验研究了轴向预压缩对 Vit-1 BMG 动态失效的影响。在 0.001 s-1 至 6000 s-1 的宽标称应变率范围内，对预压 BMG 试样进行了准静态和动态压缩试验。重点是预压缩和应变率对动态破坏应力的耦合效应。研究发现了两种截然不同的机制，它们影响着预制剪切带在不同应变速率下对裂纹扩展的影响。结果表明，随着应变速率的增加，动态破坏应力会从增强过渡到减弱；而且这些增强和减弱效应的程度取决于预压缩应变水平。最后，我们将提出一个能同时捕捉应变率和预制损伤效应的失效模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.