An engineering methodology to assess effects of weld strength mismatch on cleavage fracture toughness using the Weibull stress approach
This work describes the development of an engineering approach based upon a toughness scaling methodology incorporating the effects of weld strength mismatch on crack-tip driving forces. The approach adopts a nondimensional Weibull stress, , as a the near-tip driving force to correlate cleavage frac...
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Veröffentlicht in: | International journal of fracture 2010-08, Vol.164 (2), p.231-252 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | This work describes the development of an engineering approach based upon a toughness scaling methodology incorporating the effects of weld strength mismatch on crack-tip driving forces. The approach adopts a nondimensional Weibull stress,
, as a the near-tip driving force to correlate cleavage fracture across cracked weld configurations with different mismatch conditions even though the loading parameter (measured by
J
) may vary widely due to mismatch and constraint variations. Application of the procedure to predict the failure strain for an overmatch girth weld made of an API X80 pipeline steel demonstrates the effectiveness of the micromechanics approach. Overall, the results lend strong support to use a Weibull stress based procedure in defect assessments of structural welds. |
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ISSN: | 0376-9429 1573-2673 |
DOI: | 10.1007/s10704-010-9488-3 |