DYMAT 2009
Volume 1, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 171 - 177
Section Experimental Techniques
Published online 15 September 2009
DYMAT 2009 (2009) 171-177
DOI: 10.1051/dymat/2009023

Influence of necking propensity on the dynamic-tensile-extrusion response of fluoropolymers

E.N. Brown1, G.T. Gray III2 and C.P. Trujillo2

1  ADWP, MS A-110, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
2  MST-8, MS G-755, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

Published online: 15 September 2009

The quasi-static and dynamic responses of two fluoropolymers – polytetrafluoroethylene (PTFE) and polychlorotrifluoroethylene (PCTFE) – have been extensively characterized. Here we investigate the influence of the propensity to neck or not between PCTFE and PTFE on their responses under Dynamic-Tensile-Extrusion (Dyn-Ten-Ext). The Dyn-Ten-Ext technique was originally developed for metals and applied to copper and tantalum spheres by Gray, et al. as a tensile corollary to compressive Taylor Cylinder Impact Testing. Under Taylor Cylinder loading, both PTFE and PCTFE exhibit a classic three-diameter ductile deformation pattern. The ductile-to-brittle transition in PTFE occurs at 131 m s−1 with a very tight transition range in impact stress of less than 4 m s−1. Conversely, the ductile-to-brittle transition in PCTFE occurs between 165 and 200 m s−1 with a gradual transition to stochastic crack formation and ultimately failure. Under Dyn-Ten-Ext loading the onset of extrusion occurs above 164 and 259 m s−1 for PTFE and PCTFE respectively.

© EDP Sciences 2009