Regular Patterns on Fracture Surfaces of Polymer Gels.

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  • Tanaka Yoshimi
    Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606–01
  • Fukao Koji
    Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606–01
  • Miyamoto Yoshihisa
    Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606–01
  • Nakazawa Hatsumi
    Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606–01 Department of Applied Physics, Nagoya University, Nagoya 464–01
  • Sekimoto Ken
    Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606–01

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  • Regular Patterns on Fracture Surfaces o

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The morphology on fracture surfaces of polymer gels has been studied. Two kinds of macroscopic morphology were found depending on the crack growth rate. One is similar to the well-known river pattern and is observed at large crack growth rates and the other looks like fish scales and is observed at small crack growth rates. The change of the pattern indicates the existence of a dynamic transition. The introduction of water into the cracks in the gels increased the characteristic dimension of the regular patterns.

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