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 \(\dot a\) 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 \(\dot P\), the time derivative of P, was determined as a function of time t, and its time correlation with K ID or \(\dot a\) was examined. The findings showed that the change in \(\dot P\) was qualitatively in accord with the change in K ID or \(\dot a\). However, there existed slight differences among the values of t giving the maximum \(\dot P\), \(\dot a\) and K ID, so that their order was \(\dot a\),\(\dot P\) and K ID.
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Arakawa, K., Nagoh, D. & Takahashi, K. Dynamic crack propagation and unloading behavior of brittle polymers. International Journal of Fracture 96, 347–360 (1999). https://doi.org/10.1023/A:1018697630909
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DOI: https://doi.org/10.1023/A:1018697630909