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Numerical simulation on the deformation behaviors of bulk metallic glass composites under uniaxial tension and compression

机译：大块金属玻璃复合材料在单轴拉伸和压缩作用下变形行为的数值模拟

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摘要

The free volume model is firstly extended to describe the asymmetry of bulk metallic glass (BMG) presented under the uniaxial tensile and compressive deformations, and then the extended model is implemented into a finite element code as a user material subroutine (UMAT). Based on such a UMAT, a systematic numerical simulation is performed to investigate the deformation behaviors of BMG composites subjected to uniaxial tensile and compressive loadings. The von-Mises equivalent shear plastic strain is adopted to characterize the nucleation and propagation of shear bands in the BMG matrix here. The simulated uniaxial tensile overall stress-strain responses of the BMG composites containing different volume fractions, shapes, orientations and yielding stresses of toughening particles are compared with the compressive ones. It is shown that the initiation and propagation of shear bands in the BMG composites depend on the geometric features and yielding stresses of the toughening particles and present obviously different evolution features under the uniaxial tension and compression. The obtained results are very useful for designing and modeling the BMG composites.
机译：首先扩展了自由体积模型，以描述在单轴拉伸和压缩变形下出现的块状金属玻璃（BMG）的不对称性，然后将该扩展模型实现为有限元代码，作为用户材料子例程（UMAT）。基于这种UMAT，进行了系统的数值模拟，以研究BMG复合材料在单轴拉伸和压缩载荷下的变形行为。在此，采用von-Mises等效剪切塑性应变来表征BMG基质中剪切带的形核和传播。将包含不同体积分数，形状，取向和增韧颗粒屈服应力的BMG复合材料的模拟单轴拉伸总应力-应变响应与压缩颗粒进行了比较。结果表明，BMG复合材料中剪切带的萌生和扩展取决于增韧颗粒的几何特征和屈服应力，并且在单轴拉伸和压缩作用下表现出明显不同的演化特征。获得的结果对于设计和建模BMG复合材料非常有用。

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