TY - GEN
T1 - Effect of pulse duration on polytetrafluoroethylene shocked above the crystalline phase II-III transition
AU - Brown, Eric
AU - Gray, George Thompson
AU - Rae, Philip John
AU - Trujillo, Carl Patrick
AU - Bourne, N. K.
PY - 2007/12/1
Y1 - 2007/12/1
N2 - We present an experimental study of crystalline structure evolution of polytetrafluoroethylene (PTFE) due to pressure-induced phase transitions in a semi-crystalline polymer using soft-recovery, shock-loading techniques coupled with mechanical and chemical post-shock analysis. Gas-launched, plate impact experiments have been performed on pedigreed PTFE 7C, mounted in momentum-trapped, shock assemblies, with impact pressures above and below the phase II to phase III crystalline transition. Below the phase transition only subtle changes were observed in the cry stallinity, micro structure, and mechanical response of PTFE. Shock loading of PTFE 7C above the phase II-III transition was seen to cause both an increase in crystallinity from 38% to ∼53% and a finer crystalline microstructure, and changed the yield and flow stress behavior. We particularly focus on the effect of pulse duration on the micro structure evolution.
AB - We present an experimental study of crystalline structure evolution of polytetrafluoroethylene (PTFE) due to pressure-induced phase transitions in a semi-crystalline polymer using soft-recovery, shock-loading techniques coupled with mechanical and chemical post-shock analysis. Gas-launched, plate impact experiments have been performed on pedigreed PTFE 7C, mounted in momentum-trapped, shock assemblies, with impact pressures above and below the phase II to phase III crystalline transition. Below the phase transition only subtle changes were observed in the cry stallinity, micro structure, and mechanical response of PTFE. Shock loading of PTFE 7C above the phase II-III transition was seen to cause both an increase in crystallinity from 38% to ∼53% and a finer crystalline microstructure, and changed the yield and flow stress behavior. We particularly focus on the effect of pulse duration on the micro structure evolution.
UR - https://www.scopus.com/pages/publications/71849089068
U2 - 10.1063/1.2832995
DO - 10.1063/1.2832995
M3 - Conference contribution
SN - 9780735404694
T3 - AIP Conference Proceedings
SP - 147
EP - 150
BT - Shock Compression of Condensed Matter - 2007
T2 - 15th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter, SCCM 2007
Y2 - 1 December 2007
ER -