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Soft recovery of polytetrafluoroethylene shocked through the crystalline phase II-III transition
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Image of FIG. 1.
FIG. 1.

Schematic stress-strain curves for the three primary shock-hardening behaviors.

Image of FIG. 2.
FIG. 2.

Temperature-pressure phase diagram for PTFE and crystalline structure of PTFE in phase II. Soft recovery experiments from three velocities are shown together with the approximate shock-induced heating based on Grüneisen EOS and thermodynamics relationship following Meyers.53

Image of FIG. 3.
FIG. 3.

Crystalline structure of PTFE in phases II and III. Values for phase II from Holt and Farmer54 and for phase III from Eby et al. 50

Image of FIG. 4.
FIG. 4.

Historic (a) high- and (b) low-pressure Hugoniot data for PTFE.

Image of FIG. 5.
FIG. 5.

Schematic of the momentum trapped assembly.

Image of FIG. 6.
FIG. 6.

Preshock momentum trapped assembly and postshock soft-recovered sample at .

Image of FIG. 7.
FIG. 7.

The (a) shock impedance and (b) pressure of PTFE, PC, and PMMA at low particle velocities assuming a linear relationship. Assuming a constant amplitude pressure wave in three polymers, the relevant and associated shock impedance values for the three loading conditions are shown.

Image of FIG. 8.
FIG. 8.

Material motion plots for a recovery shot at at impact and after .

Image of FIG. 9.
FIG. 9.

A plot of pressure in the recovery fixture at 2 and after impact at .

Image of FIG. 10.
FIG. 10.

Pressure vs time for four points spaced from the center of the specimen.

Image of FIG. 11.
FIG. 11.

Crystallinity in virgin and shock prestrained PTFE 7C as determined by density and DSC. Material was taken from near the impact face and away from the core of the recovered samples.

Image of FIG. 12.
FIG. 12.

(a) Stress-strain response of virgin and shocked PTFE 7C for multiple pressures and (b) mechanical response of PTFE 7C accounting for the effective strain calculated as based on peak shock pressure.

Image of FIG. 13.
FIG. 13.

Compressive strain hardening as a function of strain rate at . Error bars fall within data points.

Image of FIG. 14.
FIG. 14.

Path dependence of PTFE stress-strain response.

Image of FIG. 15.
FIG. 15.

Stress-strain response of PTFE 7C accounting for the effective viscoelastic shock path strain based on peak shock pressure and viscoelastic unload.

Image of FIG. 16.
FIG. 16.

Tapping mode AFM maps showing the crystalline domain structure of virgin and shocked PTFE 7C as a function of pressure.


Generic image for table
Table I.

Mass fraction crystallinity values for PTFE 7C by standard methods.1

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Table II.

Hugoniot values used in the CTH calculations.

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Table III.

Flow stress and Poisson data used in the CTH modeling.

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Table IV.

Mechanical properties of PTFE 7C in compression as a function of shock pressure .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Soft recovery of polytetrafluoroethylene shocked through the crystalline phase II-III transition