Journal
ENGINEERING FRACTURE MECHANICS
Volume 76, Issue 12, Pages 1883-1896Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2009.04.008
Keywords
Brittle fracture; U-notch; Mixed mode loading; UMTS criterion; Notch stress intensity factor
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A failure criterion is proposed for brittle fracture in U-notched components under mixed-mode static loading. The criterion, called UNITS, is developed based on the maximum tangential stress criterion and also a criterion proposed in the past for mode I failure of rounded V-shaped notches [Gomez FJ, Elices M. A fracture criterion for blunted V-notched samples. Int J Fracture 2004;127:239-64]. Using the UMTS criterion, a set of fracture curves are derived in terms of the notch stress intensity factors. These curves can be used to predict the mixed mode fracture toughness and the crack initiation angle at the notch tip. An expression is also obtained from this criterion for predicting fracture toughness of U-notched components in pure mode II loading. It is shown that there is a good agreement: between the results of LIMITS criterion and the experimental data obtained by other authors from three-point bend specimens. (C) 2009 Elsevier Ltd. All rights reserved,
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