چکیده مقاله
A bonded particle model is used in three point bending simulation of rock fracture to investigate whether size of fracture process zone is an intrinsic material property Different sample sizes are used The normal bond between particles at contact points is assumed to follow a softening behavior The slope of the linear softening is considered a material property An extensive numerical analysis is conducted to obtain the nominal tensile strength, apparent fracture toughness, and width of the process zone It is shown that the apparent fracture toughness is a function of the specimen size and that the change in nominal tensile strength with specimen size can be captured by Bazant’s size effect law In addition, the numerical results suggest that inverse of width of crack tip process zone has a linear relationship with inverse of specimen size The numerical results show a stronger relationship between width of process zone and specimen size for a material with a small brittleness number On the other hand, for a more brittle material, specimen size has a small or no impact on size of process zone; process zone can be considered a material property when the brittleness number is greater than 10
کلیدواژهها
نویسندگان
Ali Tarokh
Graduate student, Department of Mineral Engineering, New Mexico Tech, Socorro
Ali Fakhimi
Professor and corresponding author, Department of Mineral Engineering, New Mexico
شیوه ارجاع
Tarokh, Ali and Fakhimi, Ali,1391,Size Effect, Fracture Toughness, and Process Zone in Numerical Simulation of Rock Fracture,9th International Congress on Civil Engineering,Isfahan
ارائهشده در
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