Analysis on shear deformation mechanism of metallic glass under confined bending test
Analysis on shear deformation mechanism of metallic glass under confined bending test
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DOI：
10.1016/j.msea.2010.06.039
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发表时间：
2010-09
期刊：
影响因子：
6.4
通讯作者：
Jiaxi Zhao;F. Wu;Z. Zhang
中科院分区：
文献类型：
--
作者：
Jiaxi Zhao;F. Wu;Z. Zhang
系统分析了锆基非晶合金在多轴载荷作用下的剪切变形机制。通过有限弯曲试验（CBT），在拉伸试样的拉伸面上产生了规则的剪切带，由于剪切带的稳定扩展，非晶合金表现出一定的塑性变形能力。此外，大多数SB与样品边缘之间的角度被测量为约55°。为了揭示CBT作用下的剪切变形机理，建立了基于有限元法的非线性接触分析模型。此外，根据模拟得到的应力结果，采用应力分析方法建立SB角与剪切变形过程之间的关系。最后，通过与实验结果的对比，得出CBT产生的应力梯度是产生一定塑性的关键因素。此外，由于试样中的多轴应力状态，SBs的萌生和扩展是稳定的。
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.