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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Tanaka et al. (1996) studied this question.
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