Controlled normal/shear loading and shear fracture in bulk metallic glasses
Controlled normal/shear loading and shear fracture in bulk metallic glasses
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DOI：
10.1016/j.intermet.2009.03.008
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发表时间：
2009-10-01
期刊：
影响因子：
4.4
通讯作者：
Becher, P. F.
中科院分区：
文献类型：
--
作者：
Hsueh, C. H.;Bei, H.;Becher, P. F.
有限的塑性限制了大块金属玻璃的工程应用，其变形通常通过形成局部剪切带来实现。克服BMG的脆性需要我们的理解的剪切带的启动和传播的机制的进步。到目前为止，主要障碍是控制剪切带和相关断裂（例如，通过传统的单轴加载）。在这里，我们展示了一种独特的加载夹具，它不仅允许控制剪切带形成和剪切断裂的位置，而且还可以改变断裂平面上的法向剪切应力的比率。改变应力比的能力允许一个系统地研究如何影响的正应力的BMG剪切断裂。虽然在之前的出版物中已经提供了一些有限数据的初步结果，但这里描述了独特测试夹具的全面描述。(C)2009爱思唯尔有限公司保留所有权利。
Limited plasticity inhibits the engineering applications of bulk metallic glasses (BMGs), which often deform by the formation of localized shear bands. Overcoming the brittleness of BMGs necessitates advances in our understanding of the mechanisms of shear band initiation and propagation. Up to now, a major hurdle has been the ability to control the generation of shear bands and the associated fracture (e.g., by conventional uniaxial loading). Here we demonstrate a unique loading fixture that allows one not only to control the locations of shear band formation and shear fracture but also to alter the ratio of the normal to shear stress on the fracture plane. The capability of altering the stress ratio allows one to systematically examine how the normal stress affects shear fracture of BMGs. While some preliminary results with limited data have been presented in a prior publication, a comprehensive description of the unique test fixture is described here. (C) 2009 Elsevier Ltd. All rights reserved.