Experimental Mechanics

, Volume 46, Issue 6, pp 735–755 | Cite as

Identification of Elasto-Plastic Constitutive Parameters from Statically Undetermined Tests Using the Virtual Fields Method

Article

Abstract

This paper presents an experimental validation of the use of the virtual fields method to identify the elasto-plastic behaviour of an iron specimen from full-field measurements with the grid method and a simple heterogeneous test configuration. The experimental procedure is carefully detailed since it is of primary importance to obtain good identification results. In particular, the use of two back-to-back cameras has proved essential to eliminate out-of-plane effects. Then, the procedure for extracting the elastic parameters and the parameters of a Voce’s hardening model using the virtual fields method is presented. The results are very convincing and encouraging for future developments using more complex test geometries leading to fully multi-axial stress states. It is a first step towards the development of such inverse procedures as an alternative to difficult and costly methods involving homogeneous tests using multi-axial testing machines.

Keywords

Optical full-filled measurements Grid method Identification Elastoplastic behavior Virtual fields method 

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Copyright information

© Society for Experimental Mechanics 2006

Authors and Affiliations

  1. 1.Laboratoire de Mécanique et Procédés de Fabrication (JE 2381)Ecole Nationale Supérieure d’Arts et MétiersChâlons-en-Champagne CedexFrance

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