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|Title:||Static and Dynamic Deformation of Metallic Glass and Its Composite - Constitutive Modelling and Experimental Investigation||Authors:||LIU JUN||Keywords:||Metallic glass, Constitutive modelling, Size effect, Finite element method, Strain rate effect, Fracture||Issue Date:||16-Aug-2013||Citation:||LIU JUN (2013-08-16). Static and Dynamic Deformation of Metallic Glass and Its Composite - Constitutive Modelling and Experimental Investigation. ScholarBank@NUS Repository.||Abstract:||The mechanical behaviour of bulk metallic glass (BMG) and bulk metallic glass composite (BMGC) under static and dynamic deformation at room temperature are studied, through constitutive modelling and experimental investigation. A large-deformation constitutive framework for BMG is introduced, and based on this, a non-local constitutive model is formulated to examine the size effect of small-volumes of metallic glass, and to investigate the cause of post-yield work-hardening and the ?smaller is stronger/weaker? phenomenon. Experiments are also conducted on recently-developed La-based BMGCs, to study the influence of degree of crystallinity and strain rate. A large-deformation rate-independent constitutive model, based on the framework established, is proposed. Finally, the fracture behaviour of La-based BMG for static and dynamic loading is investigated, and the temperature evolution within a shear band at fracture is estimated. The findings have potential application in BMG/BMGC design and usage.||URI:||http://scholarbank.nus.edu.sg/handle/10635/49141|
|Appears in Collections:||Ph.D Theses (Open)|
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