Characterization of temperature and strain fields during cyclic laser shocks

Ali Charbal (1, 2) , Ludovic Vincent (2) , François Hild (1) , Martin Poncelet (1) , John-Eric Dufour (1) , Stéphane Roux (1) , Daniel Farcage (3)

1 LMT - Laboratoire de Mécanique et Technologie
2 SRMA - Service des Recherches Métallurgiques Appliquées
3 SEARS - Service d'études analytiques et de réactivité des surfaces

Thermal shocks are applied to a 304L austenitic stainless steel plate with a pulsed laser. A stroboscopic reconstruction is used for infrared (IR) and visible light camera measurements. The displacement fields are measured with a digital image correlation (DIC) technique. Different IR devices are used to measure the temperature variations (i.e. medium wave camera and short wave pyrometry). Several ways of determining the emissivity or absorptivity are discussed. The complete 3D thermal loading is numerically determined by minimising the difference between experimental measurements and finite element analyses of thermal fields. An elastoplastic model is then used to compute mechanical fields that are compared with DIC measurements.

Mots clés: infrared thermography; laser shocks; digital image correlation; emissivity; finite element analysis

Domaines: Mécanique des matériaux [physics.class-ph]

Ali Charbal, Ludovic Vincent, François Hild, Martin Poncelet, John-Eric Dufour, et al.. Characterization of temperature and strain fields during cyclic laser shocks. Quantitative InfraRed Thermography Journal, 2015, 13 (1), pp.1-18. ⟨10.1080/17686733.2015.1077544⟩. ⟨hal-01303513⟩