Limiting conditions for compression testing of flat specimens in the split hopkinson pressure bar View Full Text


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Article Info

DATE

1999-12

AUTHORS

U. Zencker, R. Clos

ABSTRACT

The split Hopkinson pressure bar (SHPB) technique is analyzed during the initial stages of loading by means of axisymmetric finite element simulations of dynamic compression tests. Limiting strains as functions of the test parameters such as the specimen diameterd and heighth were found to ensure a one-dimensional stress state and axial stress homogeneity in specimens of elastic-perfectly plastic material. The one-dimensional stress state is necessary and sufficient for accurate test results for flat specimens (h/d≤0.5) and nonflat specimens, respectively, with diameters up to half of the bar diameter. Only very small values of the Coulomb friction constraint (μ≈0.01) seem to be acceptable. The significance of the determined limiting conditions to the more practical case of a rate dependent material is investigated using an elastic-viscoplastic material for the specimen. The stress and strain rate reconstructed from the calculated bar signals (according to the SHPB analysis) are compared with stresses and strain rates averaged over the cross section of the specimen. Well-known inertia corrections improve the results of the SHPB procedure, but errors remain for small strains and highly time dependent strain rates. More... »

PAGES

343-348

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02329815

DOI

http://dx.doi.org/10.1007/bf02329815

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1005996456


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