Accounting for the effect of local punching at the bar/specimen interface in SHPB experiments

Issue		DYMAT 2009 Volume 1, 2009 DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		81 - 87
Section		Experimental Techniques
DOI		http://dx.doi.org/10.1051/dymat/2009011
Published online		15 September 2009

DYMAT 2009 (2009) 81-87
DOI: 10.1051/dymat/2009011

Accounting for the effect of local punching at the bar/specimen interface in SHPB experiments

K. Safa and G. Gary

Laboratoire de Mécanique des Solides, CNRS UMR 7649, École Polytechnique, 91128 Palaiseau, France

Published online: 15 September 2009

Abstract
The object of this work is to provide a displacement correction for the local punching due to an axial loading at the end of a bar. For this purpose, an analytical calculation of the dynamic 3-D indentation of an elastic isotropic semi-infinite bar is carried out. It provides a first-order correction for the displacement obtained through the 1-D wave analysis commonly used in SHPB processing. This correction applies to the displacements as they are calculated at both ends of a specimen sandwiched between the two bars of a SHPB device. It improves the results obtained for the dynamic behavior of the specimen, in particular at early instants of loading.

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