Fracture modes of brittle junctions under shear

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Fracture modes of brittle junctions under shear. / Aghababaei, Ramin; Budzik, Michal K.

I: Extreme Mechanics Letters, Bind 35, 100644, 2020.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

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@article{ffe4b6f49ed943258da81a5c150384a5,
title = "Fracture modes of brittle junctions under shear",
abstract = "Friction and wear of brittle materials during sliding contact are often associated with the fracture-induced failure of interlocking asperities under shear loading. Using systematic in-situ experiments we disclosed two dominating fracture failure modes associated with the aspect ratio of the junction: (I) small aspect ratio junctions fail antisymmetrically by stable propagation of two subsurface cracks, (i.e. hand-shaking mechanism), causing the roughness creation on both surfaces and formation of particles, (II) large aspect ratio junctions fail asymetrically by unstable propagation of a single crack. Numerical simulations revealed that the transition between these two failure modes is dictated by a competition between shear versus bending induced stress state. Combining the linear elastic fracture mechanics and Timoshenko beam theory, a simple theoretical model is developed, predicting the transition in the critical force associated with each mode as a function of junction's aspect ratio and fracture properties. This understanding opens new venues towards developing a fracture model for surface asperities and physics-based predictive models for wear of brittle solids.",
keywords = "Asperity junction, Fracture, Interface, Surface mechanics, Tribology, Wear, MECHANICS, ORIGINS, ADHESIVE WEAR, TRIBOLOGY, DIAMOND, NANOSCALE WEAR",
author = "Ramin Aghababaei and Budzik, {Michal K.}",
year = "2020",
doi = "10.1016/j.eml.2020.100644",
language = "English",
volume = "35",
journal = "Extreme Mechanics Letters",
issn = "2352-4316",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Fracture modes of brittle junctions under shear

AU - Aghababaei, Ramin

AU - Budzik, Michal K.

PY - 2020

Y1 - 2020

N2 - Friction and wear of brittle materials during sliding contact are often associated with the fracture-induced failure of interlocking asperities under shear loading. Using systematic in-situ experiments we disclosed two dominating fracture failure modes associated with the aspect ratio of the junction: (I) small aspect ratio junctions fail antisymmetrically by stable propagation of two subsurface cracks, (i.e. hand-shaking mechanism), causing the roughness creation on both surfaces and formation of particles, (II) large aspect ratio junctions fail asymetrically by unstable propagation of a single crack. Numerical simulations revealed that the transition between these two failure modes is dictated by a competition between shear versus bending induced stress state. Combining the linear elastic fracture mechanics and Timoshenko beam theory, a simple theoretical model is developed, predicting the transition in the critical force associated with each mode as a function of junction's aspect ratio and fracture properties. This understanding opens new venues towards developing a fracture model for surface asperities and physics-based predictive models for wear of brittle solids.

AB - Friction and wear of brittle materials during sliding contact are often associated with the fracture-induced failure of interlocking asperities under shear loading. Using systematic in-situ experiments we disclosed two dominating fracture failure modes associated with the aspect ratio of the junction: (I) small aspect ratio junctions fail antisymmetrically by stable propagation of two subsurface cracks, (i.e. hand-shaking mechanism), causing the roughness creation on both surfaces and formation of particles, (II) large aspect ratio junctions fail asymetrically by unstable propagation of a single crack. Numerical simulations revealed that the transition between these two failure modes is dictated by a competition between shear versus bending induced stress state. Combining the linear elastic fracture mechanics and Timoshenko beam theory, a simple theoretical model is developed, predicting the transition in the critical force associated with each mode as a function of junction's aspect ratio and fracture properties. This understanding opens new venues towards developing a fracture model for surface asperities and physics-based predictive models for wear of brittle solids.

KW - Asperity junction

KW - Fracture

KW - Interface

KW - Surface mechanics

KW - Tribology

KW - Wear

KW - MECHANICS

KW - ORIGINS

KW - ADHESIVE WEAR

KW - TRIBOLOGY

KW - DIAMOND

KW - NANOSCALE WEAR

UR - http://www.scopus.com/inward/record.url?scp=85079545207&partnerID=8YFLogxK

U2 - 10.1016/j.eml.2020.100644

DO - 10.1016/j.eml.2020.100644

M3 - Journal article

AN - SCOPUS:85079545207

VL - 35

JO - Extreme Mechanics Letters

JF - Extreme Mechanics Letters

SN - 2352-4316

M1 - 100644

ER -