Extension of the virtual fields method to elasto-plastic material identification with cyclic loads and kinematic hardening

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:47

Article

Pierron, F.¹  Avril, S.²  Tran, V. The¹ 

[1] Arts & Metiers ParisTech, Lab Mecan & Procedes Fabricat, F-51006 Chalons Sur Marne, France

[2] Ecole Natl Sup Mines St Etienne, Ctr Hlth Engn, F-42023 St Etienne, France

关键词: Virtual fields method;    Optimized virtual fields;    Full-field measurement;    Elasto-plastic behaviour;    Isotropic hardening;    Kinematic hardening;    Heterogeneous tests;    Cyclic loading;    Inverse problem;   

DOI  :  10.1016/j.ijsolstr.2010.06.022

来源: Elsevier

【 摘 要 】

The virtual fields method (VFM) has been specifically developed for solving inverse problems from dense full-field data. This paper explores recent improvements regarding the identification of elasto-plastic models. The procedure has been extended to cyclic loads and combined kinematic/isotropic hardening. A specific attention has also been given to the effect of noise in the data. Indeed, noise in experimental data may significantly affect the robustness of the VFM for solving such inverse problems. The concept of optimized virtual fields that minimize the noise effects, previously developed for linear elasticity, is extended to plasticity in this study. Numerical examples with models combining isotropic and kinematic hardening have been considered for the validation. Different load paths (tension, compression, notched specimen) have shown that this new procedure is robust when applied to elasto-plastic material identification. Finally, the procedure is validated on experimental data. (C) 2010 Elsevier Ltd. All rights reserved.

【 授权许可】

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