Mechanical Response of an Al-PTFE Composite to Uniaxial Compression Over a Range of Strain Rates and Temperatures

Report No. ARL-TR-4560
Authors: Daniel T. Casem
Date/Pages: September 2008; 28 pages
Abstract: Compressive stress-strain curves were generated for a pressed and sintered mixture of polytetrafluoroethylene and aluminum powders. Experiments were performed at strain rates ranging from 0.001 to 8000/s using a servo-hydraulic load frame and a split Hopkinson pressure bar. High-rate experiments were also performed over a temperature range of 22-78 ¿C. The data is fit to the Johnson-Cook and Modified Johnson-Cook constitutive equations and also to a Zerilli-Armstrong equation adapted for use with polymers. Although the material is known to be reactive, only the inert behavior is described in this report.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2008