Abstract Plastic deformation and failure mechanisms in nano-scale notched metallic glass specimens under tensile loading
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Plastic deformation and failure mechanisms in nano-scale notched metallic glass specimens under tensile loading

机译:拉伸载荷下纳米级缺口金属玻璃试样的塑性变形和破坏机理

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AbstractIn this work, numerical simulations using molecular dynamics and non-local plasticity based finite element analysis are carried out on tensile loading of nano-scale double edge notched metallic glass specimens. The effect of acuteness of notches as well as the metallic glass chemical composition or internal material length scale on the plastic deformation response of the specimens are studied. Both MD and FE simulations, in spite of the fundamental differences in their nature, indicate near-identical deformation features. Results show two distinct transitions in the notch tip deformation behavior as the acuity is increased, first from single shear band dominant plastic flow localization to ligament necking, and then to double shear banding in notches that are very sharp. Specimens with moderately blunt notches and composition showing wider shear bands or higher material length scale characterizing the interaction stress associated with flow defects display profuse plastic deformation and failure by ligament necking. These results are rationalized from the role of the interaction stress and development of the notch root plastic zones.
机译: 摘要 在这项工作中,基于分子动力学和基于非局部可塑性的有限元分析的数值模拟是在纳米级双边缘缺口金属玻璃试样的拉伸载荷下进行的。研究了刻痕的锐度以及金属玻璃的化学成分或内部材料的长度尺度对试样塑性变形响应的影响。尽管MD和FE模拟的本质存在根本差异,但它们都显示出几乎相同的变形特征。结果显示,随着敏锐度的提高,切口尖端变形行为发生了两个明显的转变,首先是从单一剪切带占主导地位的塑性流动局部化到韧带颈缩,然后是非常尖锐的切口中的双剪切带。具有适度钝口和组成的样品显示出较宽的剪切带或较高的材料长度尺度,表征了与流动缺陷相关的相互作用应力,显示出塑性变形和韧带颈缩破坏。这些结果是根据相互作用应力和切口根部塑性区的发展而合理化的。

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