AbstractDynamic stress intensity factorsKDwere measured by the caustic method and crack propagation velocityĊby the velocity gauge techniques for PMMA poly(methyl methacrylate) during dynamic crack propagation at various strain ratesdocumentclass{article}pagestyle{empty}begin{document}$ rm dot varepsilon $end{document}. No definite applied strain rate effects on the dynamic stress intensity factor were observed for applied strain rates ranging from 8.33 × 10−4to 30/sec; however, the test results do show crack propagation velocity dependency inKD∼Ċrelations. The high local strain rate region may be realized at the running crack tip even under the quasi‐static loading case ofdocumentclass{article}pagestyle{empty}begin{document}$ rm dot varepsilon $end{document}= 8.33 × 10−4/sec, since all the crack propagation velocities obtained were greater than 50 m/sec even up t
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