Journal
ENGINEERING FRACTURE MECHANICS
Volume 99, Issue -, Pages 18-29Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2013.01.018
Keywords
Concrete fracture; Size effect; Fracture toughness; Quasibrittle materials; K-R curve
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Funding
- VTT
- State Nuclear Waste Management Fund (VYR)
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Concrete is a so called quasibrittle material which, despite predominantly elastic material response, exhibits in tension loading a stable non-linear fracture response, when tested under displacement control. The reason for the non-linearity is the development of a fracture process zone, in front of the crack, due to micro-cracking and crack bridging. The effect of the fracture process zone is to make the specimen sense the crack as being longer than a(0) + Delta a The fracture process zone causes thus an effective increase in the crack driving force and apparent fracture resistance. Here, a novel LEFM based estimate of the effective stress intensity factor and the effective crack growth at maximum load in a fracture mechanics test is used to obtain a simple power law approximation of the effective K R curve. It is shown that it is applicable to the description of not only different size specimens, but also specimens with varying geometry. The method is based on a new theoretical estimate of the effective crack growth corresponding to maximum load. (C) 2013 Elsevier Ltd. All rights reserved.
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