Abstract
Compression stress‐strain measurements have been made on commercial polymethylmethacrylate (PMMA) and polycarbonate (PC) polymers as a function of temperature (−197C to 220C) and strain rate. A split‐Hopkinson‐pressure bar (SHPB) was used to achieve strain rates of about 2500 s−1 and a servo‐hydraulic tester was used for lower strain rate testing (0.001 to 5 s−1). The mechanical response of these transparent polymers is quite different. The strength of PC is weakly dependent on strain rate, only moderately dependent on temperature, and remains ductile to −197C. In contrast, the strength of PMMA is linearly dependent on temperature and strongly dependent on strain rate. Significantly, PMMA develops cracking and fails in compression with little ductility (7–8% total strain) at either low strain rates and very low temperatures (−197C) or at high strain rates and temperatures very near ambient.
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