Numéro
J. Phys. IV France
Volume 07, Numéro C3, August 1997
EURODYMAT 1997 - 5th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) C3-773 - C3-778
DOI https://doi.org/10.1051/jp4:19973131
EURODYMAT 1997 - 5th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading

J. Phys. IV France 07 (1997) C3-773-C3-778

DOI: 10.1051/jp4:19973131

Super-Deep Penetration Phenomena as Resonance Excitation of Self-Keeping Spall Failure in Impacted Materials

O. Naimark1, F. Collombet2 and J.-L. Lataillade2

1  Institute of Continuous Media Mechanics of the Russian Academy of Sciences, 1 Acad. Korolev str., 614013 Perm, Russia
2  LAMEF-École Nationale Supérieure d'Arts et Métiers, Esplanade des Arts et Métiers, 33405 Talence cedex, France


Abstract
The anomalous responses in solid loaded dynamically are linked with the generation of the spatial-temporal structures in defect ensembles. Scenario of the evolution of typical defects (microcracks. microshears) has the form of the nonequilibrium kinetic transitions. The generation of these structures is accompanied by the qualitative changes of solid responses to loading ("dynamic branch" under spalling, super deep penetration effect).


Résumé
Les matériaux soumis à des chargements dynamiques brefs et intenses ont des comportements singuliers associés à la formation spatio-temporelle d'ensembles de défauts. L'évolution de ces défauts typiques (microfissures, microdéformations de cisaillement) suit le mode des transitions hors équilibres. La génèse de tels ensembles de défauts s'accompagne de changements qualitatifs de la réponse sous chargement dynamique des solides (arborescence dynamique de fissures d'écaillage, effets de super pénétration).



© EDP Sciences 1997