List of Journal Publications
2022
4.
Perez-Rafols, F., Nicola, L.
Incipient sliding of adhesive contacts Journal Article
In: FRICTION, vol. 10, no. 6, pp. 963–976, 2022.
Abstract | BibTeX | Tags: Adhesion, incipient sliding, traction-separation laws | Links:
@article{PerezRafols2022,
title = {Incipient sliding of adhesive contacts},
author = {F. Perez-Rafols and L. Nicola},
doi = {10.1007/s40544-021-0546-9},
year = {2022},
date = {2022-01-01},
journal = {FRICTION},
volume = {10},
number = {6},
pages = {963–976},
publisher = {Tsinghua University},
abstract = {A model is proposed herein to investigate the incipient sliding of contacts in the presence of both friction and adhesion, where the interfacial response is modeled based on traction-separation laws. A Maugis-like parameter is defined to characterize the response in the tangential direction. Subsequently, the model is used to investigate the contact between a smooth cylinder and a flat body, where adhesion-friction interactions are strong. A range of behaviors are observed when a tangential displacement is imposed: When the parameter is low, the contact pressure exhibits a relatively constant profile; when it is high, a pressure spike is observed at the edge of the contact. This difference is caused by a significant interface compliance in the former case, which limits the amount of slip. The results for the mid-range values of the Maugis-like parameter can qualitatively replicate various experiments performed using polydimethylsiloxane (PDMS) balls.},
keywords = {Adhesion, incipient sliding, traction-separation laws},
pubstate = {published},
tppubtype = {article}
}
A model is proposed herein to investigate the incipient sliding of contacts in the presence of both friction and adhesion, where the interfacial response is modeled based on traction-separation laws. A Maugis-like parameter is defined to characterize the response in the tangential direction. Subsequently, the model is used to investigate the contact between a smooth cylinder and a flat body, where adhesion-friction interactions are strong. A range of behaviors are observed when a tangential displacement is imposed: When the parameter is low, the contact pressure exhibits a relatively constant profile; when it is high, a pressure spike is observed at the edge of the contact. This difference is caused by a significant interface compliance in the former case, which limits the amount of slip. The results for the mid-range values of the Maugis-like parameter can qualitatively replicate various experiments performed using polydimethylsiloxane (PDMS) balls.
3.
Müser, Martin H, Nicola, L.
Modeling the surface topography dependence of friction, adhesion, and contact compliance Journal Article
In: MRS BULLETIN, vol. 47, no. 12, pp. 1221–1228, 2022.
Abstract | BibTeX | Tags: Adhesion, Contact, friction | Links:
@article{Mueser2022,
title = {Modeling the surface topography dependence of friction, adhesion, and contact compliance},
author = {Martin H Müser and L. Nicola},
doi = {10.1557/s43577-022-00468-2},
year = {2022},
date = {2022-01-01},
journal = {MRS BULLETIN},
volume = {47},
number = {12},
pages = {1221–1228},
publisher = {SPRINGER HEIDELBERG},
abstract = {The small-scale topography of surfaces critically affects the contact area of solids and thus the forces acting between them. Although this has long been known, only recent advances made it possible to reliably model interfacial forces and related quantities for surfaces with multiscale roughness. This article sketches both recent and traditional approaches to their mechanics, while addressing the relevance of nonlinearity and nonlocality arising in soft- and hard-matter contacts.},
keywords = {Adhesion, Contact, friction},
pubstate = {published},
tppubtype = {article}
}
The small-scale topography of surfaces critically affects the contact area of solids and thus the forces acting between them. Although this has long been known, only recent advances made it possible to reliably model interfacial forces and related quantities for surfaces with multiscale roughness. This article sketches both recent and traditional approaches to their mechanics, while addressing the relevance of nonlinearity and nonlocality arising in soft- and hard-matter contacts.
2020
2.
Salehani, M. Khajeh, Dokkum, J. S., Irani, N., Nicola, L.
On the load-area relation in rough adhesive contacts Journal Article
In: TRIBOLOGY INTERNATIONAL, vol. 144, 2020.
Abstract | BibTeX | Tags: Adhesion, Cohesive-zone model, Contact area and load, Self-affine roughness | Links:
@article{KhajehSalehani2020,
title = {On the load-area relation in rough adhesive contacts},
author = {M. Khajeh Salehani and J. S. Dokkum and N. Irani and L. Nicola},
doi = {10.1016/j.triboint.2019.106099},
year = {2020},
date = {2020-01-01},
journal = {TRIBOLOGY INTERNATIONAL},
volume = {144},
publisher = {Elsevier Ltd},
abstract = {It is well established that, at small loads, a linear relation exists between contact area and reduced pressure for elastic bodies with non-adhesive rough surfaces. In the case of adhesive contacts, however, there is not yet a general consensus on whether or not linearity still holds. In this work evidence is provided, through numerical simulations, that the relation is non-linear. The simulations here presented can accurately describe contact between self-affine adhesive rough surfaces, since they rely on Green's function molecular dynamics to describe elastic deformation and on coupled phenomenological traction-separation laws for the interfacial interactions. The analysis is performed for two-dimensional compressible and incompressible bodies under plane strain conditions. Interfaces with various roughness parameters and work of adhesion are considered.},
keywords = {Adhesion, Cohesive-zone model, Contact area and load, Self-affine roughness},
pubstate = {published},
tppubtype = {article}
}
It is well established that, at small loads, a linear relation exists between contact area and reduced pressure for elastic bodies with non-adhesive rough surfaces. In the case of adhesive contacts, however, there is not yet a general consensus on whether or not linearity still holds. In this work evidence is provided, through numerical simulations, that the relation is non-linear. The simulations here presented can accurately describe contact between self-affine adhesive rough surfaces, since they rely on Green's function molecular dynamics to describe elastic deformation and on coupled phenomenological traction-separation laws for the interfacial interactions. The analysis is performed for two-dimensional compressible and incompressible bodies under plane strain conditions. Interfaces with various roughness parameters and work of adhesion are considered.
2018
1.
Vakis, A. I., Yastrebov, V. A., Scheibert, J., Nicola, L., Dini, D., Minfray, C., Almqvist, A., Paggi, M., Lee, S., Limbert, G., Molinari, J. F., Anciaux, G., Aghababaei, R., Restrepo, S. Echeverri, Papangelo, A., Cammarata, A., Nicolini, P., Putignano, C., Carbone, G., Stupkiewicz, S., Lengiewicz, J., Costagliola, G., Bosia, F., Guarino, R., Pugno, N. M., Müser, M. H., Ciavarella, M.
Modeling and simulation in tribology across scales: An overview Journal Article
In: TRIBOLOGY INTERNATIONAL, vol. 125, pp. 169–199, 2018.
Abstract | BibTeX | Tags: Adhesion, Contact, friction, Lubrication, Multiphysics modeling, Multiscale modeling, roughness, Tribochemistry, tribology, Wear | Links:
@article{Vakis2018,
title = {Modeling and simulation in tribology across scales: An overview},
author = {A. I. Vakis and V. A. Yastrebov and J. Scheibert and L. Nicola and D. Dini and C. Minfray and A. Almqvist and M. Paggi and S. Lee and G. Limbert and J. F. Molinari and G. Anciaux and R. Aghababaei and S. Echeverri Restrepo and A. Papangelo and A. Cammarata and P. Nicolini and C. Putignano and G. Carbone and S. Stupkiewicz and J. Lengiewicz and G. Costagliola and F. Bosia and R. Guarino and N. M. Pugno and M. H. Müser and M. Ciavarella},
doi = {10.1016/j.triboint.2018.02.005},
year = {2018},
date = {2018-01-01},
journal = {TRIBOLOGY INTERNATIONAL},
volume = {125},
pages = {169–199},
publisher = {Elsevier Ltd},
abstract = {This review summarizes recent advances in the area of tribology based on the outcome of a Lorentz Center workshop surveying various physical, chemical and mechanical phenomena across scales. Among the main themes discussed were those of rough surface representations, the breakdown of continuum theories at the nano- and microscales, as well as multiscale and multiphysics aspects for analytical and computational models relevant to applications spanning a variety of sectors, from automotive to biotribology and nanotechnology. Significant effort is still required to account for complementary nonlinear effects of plasticity, adhesion, friction, wear, lubrication and surface chemistry in tribological models. For each topic, we propose some research directions.},
keywords = {Adhesion, Contact, friction, Lubrication, Multiphysics modeling, Multiscale modeling, roughness, Tribochemistry, tribology, Wear},
pubstate = {published},
tppubtype = {article}
}
This review summarizes recent advances in the area of tribology based on the outcome of a Lorentz Center workshop surveying various physical, chemical and mechanical phenomena across scales. Among the main themes discussed were those of rough surface representations, the breakdown of continuum theories at the nano- and microscales, as well as multiscale and multiphysics aspects for analytical and computational models relevant to applications spanning a variety of sectors, from automotive to biotribology and nanotechnology. Significant effort is still required to account for complementary nonlinear effects of plasticity, adhesion, friction, wear, lubrication and surface chemistry in tribological models. For each topic, we propose some research directions.
