Gap Formations in Simulations of SHPB Tests on Elastic Materials Soft in Shear

Report No. ARL-RP-272
Authors: M. N. Raftenberg; M. J. Scheidler
Date/Pages: September 2009; 12 pages
Abstract: The LS-DYNA code was applied to split Hopkinson pressure bar tests on a material at least two orders of magnitude stiffer in dilatation than in shear. Two constitutive models were applied, linear elasticity and a compressible form of Mooney-Rivlin elasticity. The latter was fitted to data from ballistic gelatin. The incident and transmission bars were aluminum. The nominal strain rate was 2500/s. Gaps appeared at the interfaces between the specimen and both bars. Unloading of the specimen and bars accompanied these gaps. The input-velocity rise time was varied to observe pulse shaping effects. Mesh sensitivity and contact-parameter sensitivity studies were performed.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2009