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- SABUROU NISHIUMA
- Shiga Bunka College, Yokaichi, Shiga 527, Japan
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- SASUKE MIYAZIMA
- Department of Engineering Physics, Chubu University, Kasugai, Aichi 487, Japan
抄録
<jats:p> Hydrogen-induced fracture of steel is characterized by the formation of internal voids caused by hydrogen precipitation at an inclusion-matrix interface, followed by the formation of microcrack array under the superposed action of internal hydrogen pressure and external forces. The propagation of the hydrogen-induced fracture is considerably random and the fracture develops by stepwise linking of the microcracks. </jats:p><jats:p> We present a new fracture model describing the patterns of crack growth by hydrogen embrittlement to find a generic feature of delayed fracture. Crack growth in solid with many initial defects is studied by Monte Carlo simulation on a square lattice. By analyzing time-dependent cluster size distribution of crack and its dynamic scaling, it is found that the crack growth process has a fractal structure. “Percolation of cracks” which corresponds to macroscopic breakdown of materials is also investigated. </jats:p>
収録刊行物
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- Fractals
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Fractals 03 (01), 79-90, 1995-03
World Scientific Pub Co Pte Lt