Cavitation in materials with distributed weak zones: Implications on the origin of brittle fracture in metallic glasses

Singh, I.; Guo, T.F.; Murali, P.; Narasimhan, R.; Zhang, Yong‐Wei; Gao, Huajian

doi:10.1016/j.jmps.2012.12.001

Cited by 39 publications

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“…2. Relating plasticity and fracture of MGs with cavitation has mainly been done theoretically [25,26] or with molecular dynamics (MD) simulations [27][28][29][30][31][32]. Since cavitation in MD simulations is associated with (athermal plastic) atomic or nano-scale processes, it is clear that the found cavities with a length up to 200 lm can only be a very late strain stage of the mechanisms proposed by MD.…”

Section: Cavitations On the Shear-band Planementioning

confidence: 99%

Long range stress fields and cavitation along a shear band in a metallic glass: The local origin of fracture

et al. 2015

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Section: Cavitations On the Shear-band Planementioning

confidence: 99%

Long range stress fields and cavitation along a shear band in a metallic glass: The local origin of fracture

et al. 2015

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“…In the light of above observations, the following questions arise pertaining to cavitation in a heterogeneous plastic solid with distributed weak zones, which has been shown by Singh et al (2013) to represent well the behavior of brittle MGs.…”

Section: Introductionmentioning

confidence: 99%

“…In order to further understand the cavitation behavior of MGs observed in experiments and atomistic simulations (Wang et al, 2007;Xia and Wang, 2012;Murali et al, 2011), Singh et al (2013) conducted finite element simulations of heterogeneous elastic-plastic solids with periodically distributed weak zones having reduced yield strength subjected to equibiaxial stretching under plane strain conditions. They demonstrated that the presence of the weak zones causes cavities to nucleate in them at hydrostatic stress levels which can be considerably lower as compared to a homogeneous plastic solid.…”

Section: Introductionmentioning

confidence: 99%

“…These features corroborate well with the observations of Murali et al (2011) pertaining to the brittle FeP glass from their atomistic simulations. From an analytical solution for a composite cylinder with a weak inner core, Singh et al (2013) also reported the possibility of snap cavitation which does not happen in a homogeneous plastic solid.…”

Section: Introductionmentioning

confidence: 99%

“…How is the stress state in the weak zones influenced by changing the remotely applied stress from equibiaxial loading as assumed by Singh et al (2013)? What is the effect of the volume fraction and yield strength of the weak zones on this relationship?…”

Section: Introductionmentioning

confidence: 99%

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Cavitation in brittle metallic glasses – Effects of stress state and distributed weak zones

Singh

Guo²,

Narasimhan

et al. 2014

International Journal of Solids and Structures

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a b s t r a c tExperimental studies and atomistic simulations have shown that brittle metallic glasses fail by a cavitation mechanism whose origin has been traced to the presence of intrinsic atomic density fluctuations which give rise to weak zones with reduced yield strength. It has been shown recently through continuum analysis that the presence of these zones can lower the cavitation stress considerably under equibiaxial loading. The objective of the present work is to study the effect of the applied stress state on the cavitation behavior of such a heterogeneous plastic solid with distributed weak zones. To this end, 2D plane strain finite element simulations are performed by subjecting a unit cell containing a weak zone to different (biaxiality) stress ratios. The volume fraction and yield strength of the weak zone are varied over a wide range. The results show that unlike in a homogeneous plastic solid, the cavitation stress of the heterogeneous aggregate does not reduce appreciably as the stress ratio decreases from unity when the yield strength of the weak zone is low. It is found that a non-dimensional parameter characterizing the stress state prevailing in the weak zone and its yield properties uniquely control the cavitation stress. The nature of cavitation bifurcation may change from unstable bifurcation to the left at sufficiently low stress ratio to one involving snap cavitation at high stress ratio.

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Constitutive Modeling in Metallic Glasses for Predictions and Designs

Li¹

2020

Handbook of Materials Modeling

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Cavitation in materials with distributed weak zones: Implications on the origin of brittle fracture in metallic glasses

Cited by 39 publications

References 39 publications

Long range stress fields and cavitation along a shear band in a metallic glass: The local origin of fracture

Long range stress fields and cavitation along a shear band in a metallic glass: The local origin of fracture

Cavitation in brittle metallic glasses – Effects of stress state and distributed weak zones

Constitutive Modeling in Metallic Glasses for Predictions and Designs

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