Scaling Effects in Penetration : A Taylor Test Approach

Abstract

Taylor Tests with L/D = 5 rods (1 cm and 0.2 cm in diameter) were conducted on armor steel (RHA) at 215 to 280 m/s to examine scale effects. AUTODYN-2D calculations confirmed dimensional analysis which predicts that strain rate should scale inversely with size. Yield strengths (yd) determined from the Wilkins-Guinan formula were found to be 7 to 9% greater in the smaller specimens which is a little less than the 12% increase predicted from a logarithmic dependence of strength on strain rate. numBriques avec AUTODYN-2D ont confirm6 I'analyse dimensionelle qui prCdit une vitesse de dCformation inversement proportionelle au diamhtre. Nos rtsultats montrent que la contrainte d'tcoulement, dCtermin6e B partir de la formule de Wilkins-Guinan, est 7 h 9% plus grande pour les petits Cchantillons. c e s valeurs sont proches des 12% d'augmentation prCdits par une dtpendance logarithmique de la contrainte en fonction de la vitesse de diformation. R&urn&