A fully integrated noise robust strategy for the identification of constitutive laws from digital images

Julien Réthoré (1, 2)

1 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]
2 MIMESIS - Mécanique Multiéchelle pour les solides

Constitutive parameter identification has been greatly improved by the achievement of full‐field measurements. In this context, noise sensitivity has been shown to be of great importance. It is crucial to incorporate noise sensitivity minimization in the design of robust identification procedures. In this paper, we investigate noise sensitivity reduction techniques for constitutive parameter identification based on Finite Element Model Updating. After examining the existing strategies, we propose a single step algorithm based on a mixed optical/mechanical cost function. The key point of this novel procedure is that no boundary conditions are needed. A first example on a real case illustrates the advantages of the proposed methodology in terms of noise sensitivity. A second example shows its capabilities to identify a non‐linear consitutive law.

Mots clés: digital image correlation; constitutive law identification; noise sensitivity; integrated approach

Domaines: Mécanique des solides [physics.class-ph]; Mécanique des solides [physics.class-ph]

Julien Réthoré. A fully integrated noise robust strategy for the identification of constitutive laws from digital images. International Journal for Numerical Methods in Engineering, 2010, 84, pp.631-660. ⟨10.1002/nme.2908⟩. ⟨hal-00938286⟩