Simultaneous FE DIC and IR thermography: advantage of a formulation in the world coordinate system
Résumé
The simultaneous use of Infra Red Thermography (IRT) and Digital Image Correlation (DIC) is getting an increasing interest for analysing the behaviour of materials. For instance, the measured displacement field can be used to follow the temperature of any material point at the surface specimen during the whole experiment. From a practical point of view, the user has nevertheless to face several issues: the texture deposited to perform DIC may not be adapted to perform IR thermography, both systems have to be calibrated together, tricky reprojections and interpolations are usually needed, etc. The recent development of new approaches to DIC, so called global DIC, open new routes for merging naturally both information. In particular, by sharing a common mesh and exploiting a cluster of cameras, a Finite Element approach to DIC written in the world coordinate system offers a real natural counterpart to FE simulation. In this work, we will show IR images can exploited in this framework to get the temperature evolution of any point on the surface. The first results obtained during a simple tensile test (performed on a stainless steel open hole specimen) will be reported.