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Soft Matter and Biological Physics

Eur. Phys. J. E 3, 395-401

Fracture energy of gels

Y. Tanaka1 - K. Fukao2 - Y. Miyamoto2

1Department of Mechanical Systems Engineering, Faculty of Engineering, Toyama Prefectural University, Kosugi-machi, Toyama 939-0398, Japan
2Department of Fundamental Sciences, Faculty of Integrated Human Studies, Kyoto University, Kyoto 606-8501, Japan

Received 8 March 2000 and Received in final form 7 July 2000

Abstract
To clarify effects of crack speed and cross-link density on the fracture energy of acrylamide gels, we evaluated the roughness of the fracture surface and measured the fracture energy taking into account the roughness. The fracture energy increases linearly with crack speed Vin a fast crack speed region, and the increasing rate of fracture energy with V decreases with increasing cross-link density in the gels. In a slow crack speed region the fracture energy depends on crack speed more strongly than in the fast crack speed region. This indicates that a qualitative change exists in the fracture process of the gels.



PACS
61.41.+e Polymers, elastomers, and plastics - 62.20.Mk Fatigue, brittleness, fracture, and cracks - 83.10.Nn Polymer dynamics

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