Abstract
We consider evolutionary PDE inclusions of the form
where \(\mathscr {R}_1\) is a positively 1-homogeneous rate-independent dissipation potential and \(W_0\) is a (generally) non-convex energy density. This work constructs solutions to the above system in the slow-loading limit \(\lambda \downarrow 0\). Our solutions have more regularity both in space and time than those that have been obtained with other approaches. On the “slow” time scale we see strong solutions to a purely rate-independent evolution. Over the jumps, we obtain a detailed description of the behavior of the solution and we resolve the jump transients at a “fast” time scale, where the original rate-dependent evolution is still visible. Crucially, every jump transient splits into a (possibly countable) number of rate-dependent evolutions, for which the energy dissipation can be explicitly computed. This, in particular, yields a global energy equality for the whole evolution process. It also turns out that there is a canonical slow time scale that avoids intermediate-scale effects, where movement occurs in a mixed rate-dependent/rate-independent way. In this way, we obtain precise information on the impact of the approximation on the constructed solution. Our results are illustrated by examples, which elucidate the effects that can occur.
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Acknowledgements
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 Research and innovation programme, Grant Agreement No. 757254 (SINGULARITY). F. R. also acknowledges the support from an EPSRC Research Fellowship on Singularities in Nonlinear PDEs (EP/L018934/1). S.S. and J.J.L.V. acknowledge support through the CRC 1060 (The Mathematics of Emergent Effects) of the University of Bonn that is funded through the German Science Foundation (DFG). S.S. further thanks for the research support PRIMUS/19/SCI/01 and UNCE/SCI/023 of Charles University and the Program GJ19-11707Y of the Czech National Grant Agency.
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Rindler, F., Schwarzacher, S. & Velázquez, J.J.L. Two-Speed Solutions to Non-convex Rate-Independent Systems. Arch Rational Mech Anal 239, 1667–1731 (2021). https://doi.org/10.1007/s00205-020-01599-z
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DOI: https://doi.org/10.1007/s00205-020-01599-z