Abstract
The mathematical treatment of evolutionary non-associative elasto-plasticity is still in its infancy. In particular, all existence results thus far rely on a spatially mollified stress admissibility constraint. Further, the evolution is formulated in a rescaled time from which it is very difficult to infer any useful information on the “real” time evolution. We propose a causal spatio-temporal mollification of the stress admissibility constraint that, while no more far-fetched than a purely spatial one, produces a more elegant and complete evolution for such models, and this in the “real” time variable.
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Notes
The Armstrong–Frederick model is the simplest plastic model that phenomenologically captures the so-called Bauschinger effect, a kind of hysteretic behavior often observed in metals under cyclic loadings [11].
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Acknowledgements
The research has been partially supported by the National Science Fundation Grant DMS-1615839, by INdAM–GNAMPA under Project 2016 “Multiscale analysis of complex systems with variational methods”, and by the Università degli Studi di Pavia through the 2017 Blue Sky Research Project “Plasticity at different scales: micro to macro”.
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Communicated by L. Ambrosio.
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Francfort, G.A., Mora, M.G. Quasistatic evolution in non-associative plasticity revisited. Calc. Var. 57, 11 (2018). https://doi.org/10.1007/s00526-017-1284-8
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DOI: https://doi.org/10.1007/s00526-017-1284-8