Dynamic-tensile-extrusion response of polytetrafluoroethylene (PTFE) and polychlorotrifluoroethylene (PCTFE)

摘要: Dynamic-Tensile-Extrusion (Dyn-Ten-Ext) experiments have been utilized to probe the dynamic tensile responses of polytetrafluoroethylene (PTFE) and polychlorotrifluoroethylene (PCTFE). These fluoropolymers exhibit more irregular deformation stochastic-based damage failure mechanisms than stable plastic elongation shear instabilities observed in metals. The technique elucidates a number that are consistent with quasi-static, SHPB, Taylor Impact results. Similar ductile-to-brittle transition for loading, PCTFE occurs at peak velocity greater PTFE. However, Dyn- Ten-Ext exhibits even resistance due stress-state. While PTFE generates large small fragments when extruded through die, draws out smaller larger particles dynamically evolve during extrusion process combination local necking bulk relaxation. Under Dyn-Ten-Ext propensity fail along normal planes is without indication any localization, while clearly forms necks initial continue evolve.