Influence of threshold parameters on cleavage fracture predictions using the Weibull stress model |
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Authors: | Claudio Ruggieri |
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Affiliation: | (1) Department of Naval Architecture and Ocean Engineering, University of São Paulo, São Paulo, SP, 05508-900, Brazil |
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Abstract: | This study explores applications of three-parameter Weibull stress models to predict cleavage fracture behavior in ferritic structural steels tested in the transition region. The work emphasizes the role of the threshold parameters (th and w – min) in cleavage fracture predictions of a surface crack specimen loaded predominantly in tension for an A515-70 pressure vessel steel. A recently proposed procedure based upon a toughness scaling methodology using a modified Weibull stress (*w) extends the calibration scheme for the Weibull modulus, m, to include the threshold parameters. The methodology is applied to calibrate the Weibull stress parameter for the tested material and then to predict the toughness distribution for the surface crack specimen. While the functional relationship between *w and m suggests a strong effect of the threshold stress, th, on the calibrated m-parameter, the results show a remarkably weak dependence of fracture predictions on th as does the dependence of fracture predictions on w–min for this specimen. |
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Keywords: | Cleavage fracture constraint local approach threshold parameter Weibull stress. |
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