[PO-C2] Poster Session 2

[P2-25] Effects of Stress Distribution on the Plastic Deformation of Metallic Glasses under Different Geometries

^○Chih-Jen Yeh¹, Hsuan-Teh Hu¹, Chang-Wei Huang², Yu-Chieh Lo³ (1.National Cheng Kung University, Taiwan, 2.Chung Yuan Christian University, Taiwan, 3.National Chiao Tung University, Taiwan)

Metallic glasses (MGs) generally have diverse mechanical properties, such as high strength and poor ductility. The deformation behaviors of MGs, to a large extent, depend on the ambient conditions. For example, the deformation of MGs is homogenous at high temperature and low stress. On the other hand, the deformation of MGs is inhomogeneous at low temperature and high stress. However, the inhomogeneous deformation further causes the shear band which is an accumulation of local plastic deformation. The formation of shear band always leads to a catastrophic failure with the increasing plastic deformation. In order to study the generation of shear band, a multiscale model which considers the microscopic shear transformation in macroscopic deformation is inevitable. In this paper, a mesoscale model combines the finite element method and the kinetic Monte Carlo method is used to investigate the properties of the metallic glasses. More mechanical properties and deformation behaviors of the MGs can be explored through the proposed model. In addition, the geometries of pores in composite MGs are investigated. Stress concentration and redistribution due to the different shapes and sizes of pores in composite MGs are discussed. These results can improve the design of the MGs and prevent MGs from catastrophic failure.