Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/12921
Title: Constitutive equations for metallic glasses: Theory, finite-element simulations and experimental verification
Authors: RAJU EKAMBARAM
Keywords: Constitutive model, Metallic glass, Finite strain, Viscoplasticity, Experimental verification
Issue Date: 2-Jan-2009
Source: RAJU EKAMBARAM (2009-01-02). Constitutive equations for metallic glasses: Theory, finite-element simulations and experimental verification. ScholarBank@NUS Repository.
Abstract: A three-dimensional, finite-deformation based, coupled thermo-mechanical constitutive model to describe the deformation behavior of bulk metallic glasses has been developed along with suitable fracture criterion to predict shear localization of these materials. The developed model has been implemented in ABAQUS/Explicit and the constitutive parameters/functions required for the model are calibrated for a commercial Zr- based alloy, a Pd- based alloy and a recently developed La- based amorphous alloy.The model along with the material parameters could accurately predict various experimental trends at high homologous temperatures, including flow behaviors like peak and steady-state stresses for different strain rates and temperatures, the transient response during jump in strain rate, transition from homogeneous to inhomogeneous deformations, variation of free volume concentration with temperature and deformation, etc. The model could also accurately reproduced experimental trends at temperatures above glass transition, for specimen deformed under multi-axial loading conditions like 3-point bending and complex metal forming experiments.
URI: http://scholarbank.nus.edu.sg/handle/10635/12921
Appears in Collections:Ph.D Theses (Open)

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