507 citations · 1.9k across the 44 of their papers we have counts for
15 papers · 1 filter
Nonparametric multiscale modeling of boundary lubrication: hexadecane in highly pressurized gold asperity contacts
Hannes Holey, Michael Moseler, Peter Gumbsch +1
Boundary lubrication is governed by molecular processes at the sliding interface that are inaccessible to classical continuum descriptions. While molecular dynamics (MD) simulation…
Active learning for parameter-free multiscale modeling of boundary lubrication
Hannes Holey, Peter Gumbsch, Lars Pastewka
Lubricated friction is a multiscale problem where molecular processes dictate the macroscopic response of the system. Traditional lubrication models rely on semi-empirical constitu…
Elastic shakedown and roughness evolution in repeated elastic-plastic contact
Lucas Frérot, Lars Pastewka
Surface roughness emerges naturally during mechanical removal of material, fracture, chemical deposition, plastic deformation, indentation, and other processes. Here, we use contin…
Why soft contacts are stickier when breaking than when making them
Antoine Sanner, Nityanshu Kumar, Ali Dhinojwala +2
Insects, pick-and-place manufacturing, engineered adhesives, and soft robots employ soft materials to stick to surfaces even in the presence of roughness. Experiments show that the…
Entropic stress of grafted polymer chains in shear flow
Jan Mees, Thomas C. O'Connor, Lars Pastewka
We analyze the shear response of grafted polymer chains in shear flow via coarse-grained molecular dynamics simulations. Our simulations confirm that the shear response is dominate…
Molecular simulations of sliding on SDS surfactant films
Johannes L. Hörmann, Chenxu Liu, Yonggang Meng +1
We use molecular dynamics simulations to study the frictional response of the anionic surfactant sodium dodecyl sulfate (SDS) monolayers and hemicylindrical aggregates physisorbed…
Yielding under compression and the polyamorphic transition in silicon
Jan Grießer, Gianpietro Moras, Lars Pastewka
We investigate the behavior of amorphous silicon under hydrostatic compression using molecular simulations. During compression, amorphous silicon undergoes a discontinuous nonequil…
Molecular mechanisms of self-mated hydrogel friction
Jan Mees, Rok Simič, Thomas C. O'Connor +2
Self-mated hydrogel contacts show extremely small friction coefficients at low loads but a distinct velocity dependence. Here we combine mesoscopic simulations and experiments to t…
Dependence of Adhesive Friction on Surface Roughness and Elastic Modulus
Daniel Maksuta, Siddhesh Dalvi, Abhijeet Gujrati +3
When adhesive elastomeric materials slide over hard rough surfaces at low velocities, there are two primary dissipative mechanisms that control how friction changes with sliding ve…
Crack-front model for adhesion of soft elastic spheres with chemical heterogeneity
Antoine Sanner, Lars Pastewka
Adhesion hysteresis can be caused by elastic instabilities that are triggered by surface roughness or chemical heterogeneity. However, the role of these instabilities in adhesion h…
Linking energy loss in soft adhesion to surface roughness
Siddhesh Dalvi, Abhijeet Gujrati, Subarna R. Khanal +3
A mechanistic understanding of adhesion in soft materials is critical in the fields of transportation (tires, gaskets, seals), biomaterials, micro-contact printing, and soft roboti…
Correlations of non-affine displacements in metallic glasses through the yield transition
Richard Jana, Lars Pastewka
We study correlations of non-affine displacement during simple shear deformation of Cu-Zr bulk metallic glasses in molecular dynamics calculations. In the elastic regime, our calcu…
Contact area of rough spheres: Large scale simulations and simple scaling laws
Lars Pastewka, Mark O. Robbins
We use molecular simulations to study the nonadhesive and adhesive atomic-scale contact of rough spheres with radii ranging from nanometers to micrometers over more than ten orders…
Supplementary material to: Finite-size effects in the interfacial stiffness of rough elastic contacts
Lars Pastewka, Nikolay Prodanov, Boris Lorenz +3
In this supplementary materials section, we provide (i) additional information on the numerical simulations of the main work, (ii) the derivation of all prefactors in the analytica…
Finite-size scaling in the interfacial stiffness of rough elastic contacts
Lars Pastewka, Nikolay Prodanov, Boris Lorenz +3
The total elastic stiffness of two contacting bodies with a microscopically rough interface has an interfacial contribution K that is entirely attributable to surface roughness. A…