Deformation and failure of bulk metallic glasses under different initial temperatures
1 Institute of Structural Mechanics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
2 State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
a Corresponding author: firstname.lastname@example.org
Published online: 7 September 2015
Based on the coupled thermo-mechanical model, a constitutive model for bulk metallic glasses (BMGs), which is generalized to the multi-axial stress state and considers the effects of free volume, heat and hydrostatic stress, has been modified in the present paper. Besides, a failure criterion of critical free volume concentration is introduced based on the coalescence mechanism of free volume. The constitutive model as well as the failure criterion is implemented into the LS-DYNA commercial software by user material subroutine (UMAT). Then FEM simulations for different initial material temperatures are conducted and the evolutions of material parameter as well as corresponding macroscopic mechanical behaviour of material are analyzed. Relative analysis shows that the initial material temperature significantly affects the deformation and failure of material.
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