A Laser Speckle Method for Measuring Displacement Field. Application to Resistance Heating Tensile Test on Steel

Christophe Pradille (1) , Michel Bellet (1) , Yvan Chastel (1)

1 CEMEF - Centre de Mise en Forme des Matériaux

Strain field measurement with non intrusive techniques is needed in order to characterize the behaviour of steels at high temperatures and when subjected to small displacements. In this work we present a technique based on laser-produced speckles coupled with a cross-correlation cross-spectrum method. This method proves more accurate than cross-correlation for small displacements. The laser wave length used (532 nm) allows to perform strain measurements, even with heat radiation.

Mots clés: full field measurement; laser speckle; cross-spectrum; cross-correlation

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Christophe Pradille, Michel Bellet, Yvan Chastel. A Laser Speckle Method for Measuring Displacement Field. Application to Resistance Heating Tensile Test on Steel. Applied Mechanics and Materials, 2010, Advances in Experimental Mechanics VII, 24-25, pp.135-140. ⟨10.4028/www.scientific.net/AMM.24-25.135⟩. ⟨hal-00524712⟩