Journal
ENGINEERING FRACTURE MECHANICS
Volume 68, Issue 10, Pages 1171-1179Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0013-7944(01)00022-4
Keywords
brittle materials; ceramics; Weibull theory
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In this paper, the effects of assuming that a brittle material can be modelled by the two-parameter Weibull distribution, if the true representation of the material behaviour is actually a three-parameter distribution, are examined. It is shown that if data from a material characterisation test is used to predict the failure of a component and the stressed surface areas are very different, then this can lead to major discrepancies in the predicted failure stress. It is also shown that if the three-parameter model is a true representation of the material behaviour, then the Weibull modulus for the two-parameter approximation will vary with surface area. (C) 2001 Elsevier Science Ltd. All rights reserved.
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