J. Phys. IV France
Volume 01, Numéro C3, Octobre 1991DYMAT 1991 - 3rd International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
|Page(s)||C3-223 - C3-228|
J. Phys. IV France 01 (1991) C3-223-C3-228
ANELASTIC RELEASE FROM THE SHOCK-COMPRESSED STATEJ.N. JOHNSON and P.S. LOMDAHL
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
Anelastic release from the shock-compressed state is analyzed in terms of internal self stresses acting on dislocation pile-ups and pinned dislocation loops. Reverse anelastic deformation occurs immediately upon release due to these internal stresses and is responsible for departure from ideal elastic-plastic unloading wave behavior : anelastic release is commonly observed in all shock-loaded metals. The rate at which this readjustment of internal stress occurs is determined by the viscous drag coefficient in the shock-compressed state and has important consequences regarding determination of elastic moduli from unloading wave data.
© EDP Sciences 1991