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A story of two transitions: From adhesive to abrasive wear and from ductile to brittle regime.
J Chem Phys
January 2024
Civil Engineering Institute, Materials Science and Engineering Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
Atomistic simulations performed with a family of model potential with tunable hardness have proven to be a great tool for advancing the understanding of wear processes at the asperity level. They have been instrumental in finding a critical length scale, which governs the ductile to brittle transition in adhesive wear, and further helped in the understanding of the relation between tangential work and wear rate or how self-affine surfaces emerge in three-body wear. However, so far, the studies were mostly limited to adhesive wear processes where the two surfaces in contact are composed of the same material.
View Article and Find Full Text PDFMode-III interfacial crack propagation in heterogeneous media.
Phys Rev E
June 2018
EOST-IPGS, Université de Strasbourg and Centre National de la Recherche Scientifique, Strasbourg 67084, France.
We monitor optically the propagation of a slow interfacial mode III crack along a heterogeneous weak interface and compare it to mode I loading. Pinning and depinning of the front on local toughness asperities within the process zone are the main mechanisms for fracture roughening. Geometrical properties of the fracture fronts are derived in the framework of self-affine scale invariance and Family-Vicsek scaling.
View Article and Find Full Text PDFLoad-separation curves for the contact of self-affine rough surfaces.
Sci Rep
July 2017
Politecnico di BARI. Department of Mechanics, Mathematics and Management, V Gentile 182, 70126, Bari, Italy.
There are two main approximate theories in the contact of rough solids: Greenwood-Williamson asperity theories (GW) and Persson theories. Neither of them has been fully assessed so far with respect to load-separation curves. Focusing on the most important case of low fractal dimension (D = 2.
View Article and Find Full Text PDFFriction and universal contact area law for randomly rough viscoelastic contacts.
J Phys Condens Matter
March 2015
DII, Universitá del Salento, 73100 Monteroni-Lecce, Italy. PGI, FZ-Jülich, 52425 Jülich, Germany.
We present accurate numerical results for the friction force and the contact area for a viscoelastic solid (rubber) in sliding contact with hard, randomly rough substrates. The rough surfaces are self-affine fractal with roughness over several decades in length scales. We calculate the contribution to the friction from the pulsating deformations induced by the substrate asperities.
View Article and Find Full Text PDFUsing Green's function molecular dynamics to rationalize the success of asperity models when describing the contact between self-affine surfaces.
Phys Rev E Stat Nonlin Soft Matter Phys
August 2008
CANMET-Materials Technology Laboratory, Natural Resources Canada, Ottawa, Ontario, Canada K1A 0G1.
We use Green's function molecular dynamics to evaluate the effectiveness of asperity models when describing the contact mechanics of elastic solids with self-affine surfaces. Surfaces are created with the help of a Fourier filtering algorithm, and the interactions between the solids are modeled via hard-wall potentials. We illustrate how the real area of contact A_{real} is formed by a set of contact clusters.
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