Bridging necking and shear-banding mediated tensile failure in glasses

Riedl, David; Lund, Ethen; Schroers, Jan; Bouchbinder, Eran

doi:10.1103/physrevmaterials.7.l032601

Cited by 3 publications

(1 citation statement)

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“…By combining these analyses on different scales, our results greatly extend previous work on single gel strands 41,54 and on breakage of glassy (amorphous) samples, 46,55 and other soft materials. 56 Some other approaches to gel modelling 57,58 consider the gel as a continuum, without resolving individual strands -our approach can connect such models with the microscopic gel structure.…”

Section: Introductionsupporting

confidence: 74%

Necking and failure of a particulate gel strand: signatures of yielding on different length scales

Thijssen,

Liverpool,

Royall

et al. 2023

Soft Matter

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Section: Introductionsupporting

confidence: 74%

Necking and failure of a particulate gel strand: signatures of yielding on different length scales

Thijssen,

Liverpool,

Royall

et al. 2023

Soft Matter

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Connecting microscopic and mesoscopic mechanics in model structural glasses

Richard

2024

The Journal of Chemical Physics

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We present a novel formalism to characterize elastic heterogeneities in amorphous solids. In particular, we derive high-order strain-energy expansions for pairwise energies under athermal quasistatic dynamics. We then use the presented formalism to study the statistical properties of pairwise expansion coefficients and their link with the statistics of soft, quasilocalized modes, for a wide range of formation histories in both two- and three-dimensional systems. We further exploit the presented framework to access local yield stress maps by performing a non-linear stress–strain expansion within a cavity embedded in a frozen matrix. We show that our “bond micromechanics” compare well with the original “frozen matrix” method, with the caveat of overestimating large stress activations. We additionally show how local yield rules can be used as an input for a scalar elasto-plastic model (EPM) to predict the stress response of materials ranging from ductile to brittle. Finally, we highlight some of the limits of simple mesoscale models in capturing the aging dynamics of post-yielding systems. Intriguingly, we observe subdiffusive and diffusive shear band growths for particle-based simulations and EPMs, respectively.

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Elementary processes in dilatational plasticity of glasses

Moriel,

Richard,

Lerner

et al. 2024

Phys. Rev. Research

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Materials typically fail under complex stress states, essentially involving dilatational (volumetric) components that eventually lead to material decohesion/separation. It is therefore important to understand dilatational irreversible deformation—i.e., dilatational plasticity—en route to failure. In the context of glasses, much focus has been given to shear (volume-preserving) plasticity, both in terms of the stress states considered and the corresponding material response. Here, using a recently developed methodology and extensive computer simulations, we shed basic light on the elementary processes mediating dilatational plasticity in glasses. We show that plastic instabilities, corresponding to singularities of the glass Hessian, generically feature both dilatational and shear irreversible strain components. The relative magnitude and statistics of the strain components depend both on the symmetry of the driving stress (e.g., shear versus hydrostatic tension) and on the cohesive (attractive) part of the interatomic interaction. We further show that the tensorial shear component of the plastic strain is generally nonplanar and also extract the characteristic volume of plastic instabilities. Elucidating the fundamental properties of the elementary micromechanical building blocks of plasticity in glasses sets the stage for addressing larger-scale, collective phenomena in dilatational plasticity such as topological changes in the form of cavitation and ductile-to-brittle transitions. As a first step in this direction, we show that the elastic moduli markedly soften during dilatational plastic deformation approaching cavitation. Published by the American Physical Society 2024

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Bridging necking and shear-banding mediated tensile failure in glasses

Cited by 3 publications

References 50 publications

Necking and failure of a particulate gel strand: signatures of yielding on different length scales

Necking and failure of a particulate gel strand: signatures of yielding on different length scales

Connecting microscopic and mesoscopic mechanics in model structural glasses

Elementary processes in dilatational plasticity of glasses

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