Thickness effects in split Hopkinson pressure bar tests

Results are presented for the high strain rate behaviour of a medium and high density polyethylene, polycarbonate and poly(ether ether ketone) in compression for strain rates up to 10 4s −1 obtained using a split Hopkinson pressure bar apparatus. It is shown that the choice of specimen thickness in...

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Bibliographic Details
Published in:Polymer (Guilford) 1993-01, Vol.34 (20), p.4230-4234
Main Authors: Dioh, N.N, Leevers, P.S, Williams, J.G
Format: Article
Language:English
Subjects:
Applied sciences
compression
Exact sciences and technology
Polymer industry, paints, wood
Properties and testing
specimen dimensions
strain rate
Technology of polymers
Testing and control
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Summary:Results are presented for the high strain rate behaviour of a medium and high density polyethylene, polycarbonate and poly(ether ether ketone) in compression for strain rates up to 10 4s −1 obtained using a split Hopkinson pressure bar apparatus. It is shown that the choice of specimen thickness in these tests significantly affects the measured flow stresses at high strain rates, with the thicker specimens showing an apparent enhancement of flow stress at high rates. Comparison of the present results with published work suggests that some high strain rate data in the literature could be erroneous due to an inappropriate choice of specimen dimensions.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(93)90181-9