Dynamic crack propagation and unloading behavior of brittle polymers

K. Arakawa, D. Nagoh, K. Takahashi

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21 Citations (Scopus)


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 KID and crack velocity ȧ 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 Ṗ, the time derivative of P, was determined as a function of time t, and its time correlation with KID or ȧ was examined. The findings showed that the change in Ṗ was qualitatively in accord with the change in KID or ȧ. However, there existed slight differences among the values of t giving the maximum Ṗ, ȧ and KID, so that their order was ȧ, Ṗ and KID.

Original languageEnglish
Pages (from-to)345-358
Number of pages14
JournalInternational Journal of Fracture
Issue number4
Publication statusPublished - Dec 1 1999

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Modelling and Simulation
  • Mechanics of Materials


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