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Dynamic stress intensity factors during viscoelastic crack propagation at various strain rates
Author(s) -
Kobayashi Akira,
Ohtani Nobuo,
Munemura Masayuki
Publication year - 1980
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1980.070251211
Subject(s) - viscoelasticity , materials science , stress intensity factor , dynamic stress , composite material , strain (injury) , fracture mechanics , stress (linguistics) , intensity (physics) , structural engineering , dynamic loading , engineering , physics , optics , medicine , linguistics , philosophy
Dynamic stress intensity factors K D were measured by the caustic method and crack propagation velocity Ċ by the velocity gauge techniques for PMMA [poly(methyl methacrylate)] during dynamic crack propagation at various strain rates \documentclass{article}\pagestyle{empty}\begin{document}$ \rm \dot \varepsilon $\end{document} . No definite applied strain rate effects on the dynamic stress intensity factor were observed for applied strain rates ranging from 8.33 × 10 −4 to 30/sec; however, the test results do show crack propagation velocity dependency in K D ∼ Ċ relations. The high local strain rate region may be realized at the running crack tip even under the quasi‐static loading case of \documentclass{article}\pagestyle{empty}\begin{document}$ \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 to 450 m/sec.