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Parameter estimation for a viscoplastic damage model using a gradient‐based optimization algorithm

Rolf Mahnken (Institut für Baumechanik und Numerische Mechanik, University of Hannover, Hannover, Germany)
Magnus Johansson (Division of Solid Mechanics, Chalmers University of Technology, Göteborg, Sweden)
Kenneth Runesson (Division of Solid Mechanics, Chalmers University of Technology, Göteborg, Sweden)

Engineering Computations

ISSN: 0264-4401

Article publication date: 1 November 1998

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Abstract

In this work a gradient‐based optimization method is applied in order to determine material parameters for a viscoplastic model with dynamic yield surface coupled to damage as presented in 1997. To this end a sensitivity analysis consistent with the integration scheme presented previously is performed in a systematic manner, both for strain and stress controlled experiments. The algorithm is tested in two numerical examples: first, simulated data are used, in order to re‐obtain parameters for the case of damage under monotonic loading. In the second example material parameters are obtained based on experimental data for lcf‐testing of an austenetic stainless steel, thus showing a very good agreement with respect to hardening, rate and damage effects.

Keywords

Citation

Mahnken, R., Johansson, M. and Runesson, K. (1998), "Parameter estimation for a viscoplastic damage model using a gradient‐based optimization algorithm", Engineering Computations, Vol. 15 No. 7, pp. 925-955. https://doi.org/10.1108/02644409810236920

Publisher

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MCB UP Ltd

Copyright © 1998, MCB UP Limited

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