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Size-effect Prediction from the Double-K Fracture Model for Notched Concrete Beam

Department of Civil Engineering, Indian Institute of Technology Kharagpur 721302, India

^* To whom correspondence should be addressed.

	Abstract

The size-effect predictions from double-K fracture criterion, characterized by two parameters: the initiation toughness and the unstable toughness, are compared with the fictitious crack model or cohesive crack model for practical (laboratory) size range of three-point bend test notched specimens. Both the fracture models, although, adopt different crack propagation criteria, they yield indistinguishable crack initiation and unstable fracture loads for usual laboratory size specimens. Notable difference in the predicted crack initiation and unstable fracture loads are observed for asymptotic large size specimens and these loads are more conservative than those obtained using the fictitious crack model by 20 and 22%, respectively.

Key Words: three-point bending geometry, size-effect, mode-I fracture, double-K fracture parameters, weight function, cohesive stress.

First published on March 31, 2009
International Journal of Damage Mechanics 2009, doi:10.1177/1056789508101187


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