Simulation of crack propagation in fiber-reinforced bulk metallic glasses

Abstract

a b s t r a c tBased on a phase-field model for deformation in bulk metallic glasses (BMGs), shear band formation and crack propagation in the fiber-reinforced BMG are investigated. Ideal unbroken fibers embedded in the BMG matrix are found to significantly influence the shear banding and crack propagation in the matrix. The crack propagation affected by fibers' length and orientation is quantitatively characterized and is described by micromechanics models for composite materials. Furthermore, fractures in some practical fiber-reinforced BMG composites such as tungsten-reinforced Zr-based BMG are simulated. The relation between the enhanced fracture toughness and the mechanical properties of fiber reinforcements is determined. Different fracture modes of BMG-matrix composites are identified from the systematic simulation studies, which are found to be consistent with experiments. The simulation results suggest that the phase-field modeling approach could be a useful tool to assist the fabrication and design of BMG composites with high fracture toughness and ductility.

Metallic glass matrix composites

“…In order to reveal the mechanisms of the improved ductility in MGMCs, the maximum shear stress fields defined as: MGMCs is achieved by Zheng et al [408,559]. Multiple shear bands can be initiated from the interface.…”

Simulation of shear banding and crack propagation in bulk metallic glass matrix composites

“…Details of the simulation of cracking in the crystalline reinforcing fiber can be found in Ref. [12].…”

Materials by design: An experimental and computational investigation on the microanatomy arrangement of porous metallic glasses

“…[47], fracture surface energy a sf from Ref. [52], and the defect-free energy coefficient a def and resistance to free volume generation due to mechanisms other than plastic strain a res from Ref. [53].…”