On probabilistic aspects in the dynamic degradation of ductile materials

Hervé Trumel (1) , François Hild (2) , Gilles Roy (3) , Yves-Patrick Pellegrini (4) , Christophe Denoual (4)

1 LMPM - Laboratoire Mécanique et Physique des Matériaux
2 LMT - Laboratoire de Mécanique et Technologie
3 DAM/VALDUC - VALDUC
4 BIII - CEA

Dynamic loadings produce high stress waves leading to the spallation of ductile materials such as aluminum, copper, magnesium or tantalum. The main mechanism used herein to explain the change of the number of cavities with the stress rate is nucleation inhibition, induced by the growth of already nucleated cavities. The dependence of the spall strength and critical time with the loading rate is investigated in the framework of a probabilistic model. The present approach, which explains previous experimental findings on the strain-rate dependence of the spall strength, is applied to analyze experimental data on tantalum.

Mots clés: Dynamic ductile damage; Probabilistic model; Tantalum

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

Hervé Trumel, François Hild, Gilles Roy, Yves-Patrick Pellegrini, Christophe Denoual. On probabilistic aspects in the dynamic degradation of ductile materials. Journal of the Mechanics and Physics of Solids, 2009, 57, pp.1980-1998. ⟨10.1016/j.jmps.2009.07.001⟩. ⟨hal-00410324⟩