Influence of porosity on spallation behavior of pure aluminum under impact loading |

Issue		Volume 2, 2009 DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		1179 - 1183
Section		Micro-Structural Effects
DOI		10.1051/dymat/2009165
Published online		15 September 2009

DYMAT 2009 (2009) 1179-1183
DOI: 10.1051/dymat/2009165

Influence of porosity on spallation behavior of pure aluminum under impact loading

Y.G. Wang¹ and H.L. He²

¹ Mechanics and Materials Science Research Center, Ningbo University, Ningbo 315211, Zhejiang, China
² Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, PO Box 919-102, Mianyang 621900, PR China

Published online: 15 September 2009

Abstract
Spallation properties have been investigated in this work for the aluminum with a porosity of 3.3% under high velocity and planar plate impact. A push-pull type velocity interferometer system for any reflector (VISAR) was used to measure the rear free surface velocity profiles of the samples. Results show that there are three distinct shock compressive waves in succession, including elastic wave, compaction wave and stable shock wave. The spallation occurs after the porosity being fully compacted and the stable shock wave being formed. The influence of the low initial porosity on the spallation behavior of low-porosity aluminum is significant. With the increase of impact velocity, the spallation strength becomes stronger. Nevertheless, the spallation strength of the shock compacted aluminum is apparently lower than that of the solid dense aluminum, and is approached to that of the aluminum alloy 6061-T6. Physical explanations are illustrated and discussed.

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