Abstract
Limitations of single scale approaches to study the complex physics involved in friction have motivated the development of multiscale models. We review the state-of-the-art multiscale models that have been developed up to date. These have been successfully applied to a variety of physical problems, but that were limited, in most cases, to zero Kelvin studies. We illustrate some of the technical challenges involved with simulating a frictional sliding problem, which by nature generates a large amount of heat. These challenges can be overcome by a proper usage of spatial filters, which we combine to a direct finite-temperature multiscale approach coupling molecular dynamics with finite elements. The basic building block relies on the proper definition of a scale transfer operator using the least square minimization and spatial filtering. Then, the restitution force from the generalized Langevin equation is modified to perform a two-way thermal coupling between the two models. Numerical examples are shown to illustrate the proposed coupling formulation.
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This material is based on the work supported by the Swiss National Foundation under Grant no 200021_122046/1 and the European Research Council Starting Grant no 240332.
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Ramisetti, S.B., Anciaux, G., Molinari, JF. (2015). MD/FE Multiscale Modeling of Contact. In: Gnecco, E., Meyer, E. (eds) Fundamentals of Friction and Wear on the Nanoscale. NanoScience and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-10560-4_14
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