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 104 s-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.
Посилання на статтю:
Thickness effects in split Hopkinson pressure bar tests / N. N. Dioh*, P. S. Leevers and J. G. Williams // Polymer. – 1993. – Vol 34. – P. 4230-4234.