Coupled thermo-mechanical modelling of bulk-metallic glasses: Theory, finite-element simulations and experimental verification

Thamburaja, T Prakash G.; Ekambaram, R.

doi:10.1016/j.jmps.2006.11.008

Cited by 78 publications

(45 citation statements)

References 35 publications

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“…Noted that Eq. (6a) is similar with the Langevin equation describing the diffusion of stochastic particles, the phase-field model for the description of free-volume defects developed above is in general differs from the previous work (Spaepen, 1977;Thamburaja and Ekambaram, 2007) where the evolution of free volumes is treated by diffusion-creation-annihilation equation, or transition state model. It remains very interesting to compare these two approaches.…”

Section: Phase-field Modeling Of Crack Propagation In Bmgmentioning

confidence: 98%

Simulation of crack propagation in fiber-reinforced bulk metallic glasses

Zheng

Shen

2010

International Journal of Solids and Structures

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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.

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Section: Phase-field Modeling Of Crack Propagation In Bmgmentioning

confidence: 98%

Simulation of crack propagation in fiber-reinforced bulk metallic glasses

Zheng

Shen

2010

International Journal of Solids and Structures

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“…The phase evolution approach was originally developed for shape memory alloys (SMAs) to describe their pseudo-elastic thermomechanical response, stress induced phase transformation phenomena, and hence the shape memory behavior (Auricchio et al, 2007;Dachkovski and Böhm, 2004;Hassan et al, 2008;Levitas and Ozsoy, 2009a, b;Moumni et al, 2008;Müller and Bruhns, 2006;Popov and Lagoudas, 2007;Reese and Christ, 2008;Thamburaja and Ekambaram, 2007;Thamburaja and Nikabdullah, 2009;Wang et al, 2008). Unlike in SMAs, however, the concept of "phase" in SMPs may not necessarily be physically based, but rather phenomenologically based.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Temperature and rate dependent thermomechanical modeling of shape memory polymers with physics based phase evolution law

Yang

2016

International Journal of Plasticity

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“…x is the current free volume concentration, and the evolution of x relies on applied stress, heat and diffusion (Spaepen, 1977;Argon, 1979;Huang et al, 2002;Thamburaja and Ekambaram, 2007;Li et al, 2013). q is the free volume softening coefficient.…”

Section: Constitutive Relationsmentioning

confidence: 99%

Nature of crack-tip plastic zone in metallic glasses

Chen

Dai

2016

International Journal of Plasticity

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a b s t r a c tThe fracture of metallic glasses(MGs) can be induced by shear banding in a ductile mode or by cavitation in a brittle way. Plastic zone in front of a crack tip, which is greatly involved with localized shear band, cavitation and the resultant fracture morphology, is a key clue to unveil the secrets of the intrinsic ductility and fracture. However, the characteristics of plastic zone, i.e., stress and strain distributions, size and shape, have not been clearly unraveled for MGs so far. In this paper, an analytical solution of the plastic zone for mode I crack under plane strain condition is derived through J-integral based on a slip line field analysis and shape approximation, by taking pressure-sensitivity, dilatancy, and structural evolution into account. Two length scales of the plastic zone, i.e. the maximum radius R max and the radius along the crack line direction R x , are revealed to control shear flow instability and cavitation, and therefore failure modes. According to shear transformation zone (STZ) based free volume evolution dynamics, the critical values of the mode I stress intensity factor and the plastic zone size at crack initiation are obtained. The effects of Poisson's ratio, pressure sensitivity, and dilatancy on the stress/strain distributions, and the size of plastic zone are elucidated. It is found that larger Poisson's ratio and smaller dilatancy lead to higher fracture toughness and 'slender' critical plastic zone, facilitating a good ductility. The internal correlations of the fracture pattern (i.e. dimple structure) with the plastic zone are established, where the size of the fracture pattern is quantitatively characterized by the critical length of plastic zone. To be further, a shape change of the critical plastic zone from 'slender' (apt to shear plastic flow) to 'chubby' (inclined to cavitation) is revealed with increasing dilatancy or decreasing Poisson's ratio, which might shed light on the underlying mechanism of ductile-to-brittle transition in MGs.

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Coupled thermo-mechanical modelling of bulk-metallic glasses: Theory, finite-element simulations and experimental verification

Cited by 78 publications

References 35 publications

Simulation of crack propagation in fiber-reinforced bulk metallic glasses

Simulation of crack propagation in fiber-reinforced bulk metallic glasses

Temperature and rate dependent thermomechanical modeling of shape memory polymers with physics based phase evolution law

Nature of crack-tip plastic zone in metallic glasses

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