Dynamic crack propagation and unloading behavior of brittle polymers |
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Authors: | K. Arakawa D. Nagoh K. Takahashi |
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Affiliation: | (1) Research Institute for Applied Mechanics, Kyushu University, Kasuga 816, Fukuoka, Japan |
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Abstract: | The method of caustics in combination with a Cranz–Schardin high-speed camera was utilized to study dynamic crack propagation and unloading behavior of epoxy, PMMA and Homalite-100 specimens. Dynamic stress intensity factor K ID and crack velocity were evaluated in the course of crack propagation. Caustic patterns at the loading points were also recorded to estimate load P applied to the specimen. Unloading rate , the time derivative of P, was determined as a function of time t, and its time correlation with K ID or was examined. The findings showed that the change in was qualitatively in accord with the change in K ID or . However, there existed slight differences among the values of t giving the maximum , and K ID, so that their order was , and K ID. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Dynamic crack propagation unloading behavior stress intensity factor crack velocity unloading rate brittle polymers epoxy PMMA homalite-100 caustic method. |
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