DYMAT 2009
Volume 1, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 497 - 502
Section Experimental Techniques
Published online 15 September 2009
DYMAT 2009 (2009) 497-502
DOI: 10.1051/dymat/2009071

Dynamic mechanical behaviour of polyethylene

R.T. Moura1, A.H. Clausen2, M. Langseth2 and M. Alves1

1  Group of Solid Mechanics and Structural Impact, University of Sao Paulo, Brazil
2  CRI-SIMLab, Dept. of Structural Engineering, NTNU, Trondheim, Norway

Published online: 15 September 2009

Dynamic compressive curves of high density semi-crystalline polyethylene, PEHD, were obtained via the Split Hopkinson Pressure Bar, SHPB, technique. The SHPB was fitted with polymeric bars, PMMA, to avoid a large impedance mismatch between the specimens and the bars. As a consequence, attenuation and dispersion had to be taken into account. Care was also exercised with frictional effects by using ring specimens instead of flat disks. Ring specimens have the additional advantage of yielding a more constant strain rate in the tests. The results clearly show a very strain rate sensitive material, a feature which should be taken into consideration when analysing PEHD components.

© EDP Sciences 2009