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Title |
Effects of Crack Velocity on Fracture Properties of Modified S-FPZ Model
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Keywords |
콘크리트; 균열속도; 파괴기준; 파괴에너지; 파괴진행대; concrete; crack velocity; fracture criterion; fracture energy; fracture process zone |
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Abstract |
The fracture energy evaluated from the previous experimental results can be simulated by using the modified singular fracture process zone (S-FPZ) model. The fracture model has two fracture properties of strain energy release rate for crack extension and crack close stress versus crack width relationship fccs(ω) for fracture process zone (FPZ) development. The fccs(ω) relationship is not sensitive to specimen geometry and crack velocity. The fracture energy rate in the FPZ increases linearly with crack extension until the FPZ is fully developed. The fracture criterion of the strain energy release rate depends on specimen geometry and crack velocity as a function of crack extension. The variation of strain energy release rate with crack extension can explain theoretically the micro-cracking, micro-crack localization and full development of the FPZ in concrete.
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