Identification of elasto-plastic constitutive parameters from statically undetermined tests using the virtual fields method

Pannier, Y., Avril, S., Rotinat, R. and Pierron, F. (2006) Identification of elasto-plastic constitutive parameters from statically undetermined tests using the virtual fields method. Experimental Mechanics, 46 (6), 735-755. (doi:10.1007/s11340-006-9822-x).

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.

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Contributors

Author: F. Pierron

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