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Analysis on shear deformation mechanism of metallic glass under confined bending test

机译：局限弯曲试验下金属玻璃的剪切变形机理分析

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摘要

The shear deformation mechanism of Zr-based metallic glass under multiaxial loadings was systematically analyzed. By means of a confined bending test (CBT), some regular shear bands (SBs) initiated on the tension surface of the specimen and the metallic glass showed certain plastic deformation ability due to the stable propagation of SBs. Moreover, the angles between most of the SBs and the edges of the specimen were measured to be 55° approximately. In order to reveal the shear deformation mechanism under the CBT, a nonlinear contact analytical model based on the finite element method (FEM) was proposed. Furthermore, according to the stress results obtained by simulations, a stress analysis method was employed to establish the relationship between the SB angle and the shear deformation process. Finally, compared with the experimental results above, it was concluded that the stress gradient produced by CBT was the key factor which could stimulate certain plasticity. Additionally, the initiation and propagation of the SBs were stable due to the multiaxial stress state in specimen.
机译：系统分析了Zr基金属玻璃在多轴载荷下的剪切变形机理。通过限制弯曲试验（CBT），在试样和金属玻璃的受拉面上会产生一些规则的剪切带（SBs），这是由于SBs的稳定传播而具有一定的塑性变形能力。此外，大多数SB与样品边缘之间的夹角约为55°。为了揭示CBT条件下的剪切变形机理，提出了基于有限元方法的非线性接触解析模型。此外，根据模拟得到的应力结果，采用应力分析方法建立了SB角与剪切变形过程之间的关系。最后，与上述实验结果相比，可以得出结论，CBT产生的应力梯度是可以刺激一定塑性的关键因素。此外，由于样品中的多轴应力状态，SB的萌发和传播是稳定的。

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  • 来源
    《Materials Science and Engineering》 |2010年第23期|p.6224-6229|共6页
  • 作者

    J.X. Zhao; F.F. Wu; Z.F. Zhang;

  • 作者单位

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;

    rnShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China School of Materials Science and Engineering, Liaoning University of Technology, 169 Shiying Street, jinzhou 121001, China;

    rnShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    metallic glasses; confined bending test; plastic deformation; shear bands;

    机译：金属玻璃密闭弯曲试验;塑性变形;剪切带;

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