Endommagement sous choc dans les métaux : mesure et prédiction

Shocks by means of plate impact (Al/Cu and Al/Ta) and laser impact on Al and Ta are reproduced with a viscoplastic extension of the Gurson model. Introduction of viscosity in the model allows to account for impacts at different velocities. Damage levels in the targets are analysed through microtomography measurements at the ESRF. On a laser shock on Al, the pore volume distribution curve is of the power-law type at large volumes.