| Numéro |
J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
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|---|---|---|
| Page(s) | 935 - 940 | |
| DOI | https://doi.org/10.1051/jp4:2006134143 | |
| Publié en ligne | 26 juillet 2006 | |
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 935-940
DOI: 10.1051/jp4:2006134143
The influence of temperature and strain rate on the tensile and compressive constitutive response of four fluoropolymers
E.N. Brown, P.J. Rae and G.T. GrayMST-8, MS G-755, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Published online: 26 July 2006
Abstract
Fluoropolymers posses several advantageous properties for
load-bearing structural components including higher strength at
elevated temperatures and higher toughness at lowered temperatures.
Stress-strain studies have been conducted on two homopolymers
(Teflon (PTFE) and KEL-F 81 (PCTFE)) and two copolymers (KEL-F 800
and THV 500G) as a function of temperature and strain rate. A
split-Hopkinson pressure bar (SHPB) was used to achieve a strain
rate of 
3200/s in compression, while screw-driven testing
machines afforded a strain rate of 0.001/s. A tensile
split-Hopkinson pressure bar (T-SHPB) was used for testing at strain
rates of 800/s in tension. To address the large strains to failure
(up to 700% extension) an optical extensometer was employed for a
strain rate of 0.005/s in tension. The effects of temperature and
strain rate for this family of polymers is presented in detail,
including an observed shift in glass transition (
to
higher temperatures with increased strain rate and rate
insensitivity of thermally-induced phase transitions.
© EDP Sciences 2006