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

E. N. Brown, G. T. Gray, C. P. Trujillo
2009 DYMAT 2009 - 9th International Conferences on the Mechanical and Physical Behaviour of Materials under Dynamic Loading   unpublished
The quasi-static and dynamic responses of two f1uoropol ymers 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
more » ... sive 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' \ with a very ti ght transition range in impact stress of less than 4 m s·\. Conversely, the ductile-to-brittle transition in PCTFE occurs between 165 and 200 m s'\ 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'\ for PTFE and PCTFE respectively.
doi:10.1051/dymat/2009023 fatcat:5527fwxchzc23cqlrz5sgwoepu