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A Dissipation Gap Method for full‐field measurement‐based identification of elasto‐plastic material parameters
Author(s) -
Blaysat B.,
Florentin E.,
Lubineau G.,
Moussawi A.
Publication year - 2012
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.4287
Subject(s) - dissipation , identification (biology) , isotropy , finite element method , nonlinear system , field (mathematics) , context (archaeology) , computer science , displacement field , digital image correlation , displacement (psychology) , algorithm , mathematics , engineering , structural engineering , physics , geology , optics , psychology , paleontology , botany , quantum mechanics , pure mathematics , psychotherapist , biology , thermodynamics
SUMMARY Using enriched data such as displacement fields obtained from digital image correlation is a pathway to the local identification of material parameters. Up to now, most of the identification techniques for nonlinear models are based on Finite Element Updating Methods. This article explains how an appropriate use of the Dissipation Gap Method can help in this context and be an interesting alternative to these classical techniques. The Dissipation Gap Methods rely on the concept of error in dissipation that has been used mainly for the verification of finite element simulations. We provide here an original application of these founding developments to the identification of material parameters for nonlinear behaviors. The proposed technique and especially the main technical keypoint of building the admissible fields are described in detail. The approach is then illustrated through the identification of heterogeneous isotropic elasto‐plastic properties. The basic numerical features highlighted through these simple examples demonstrate this approach to be a promising tool for nonlinear identification.Copyright © 2012 John Wiley & Sons, Ltd.