The effect of geometry and strength mismatch on brittle fracture initiated from cracks located at the fusion line of weldments is investigated. The scope has been to derive expressions for the crack tip constraint, and thereby open for transferability schemes from one geometry/mismatch condition to another. The procedure has been phrased the J-Q-M approach, where Q quantifies the geometrical effects and M the material mismatch effects. In the paper the J-Q-M approach is applied to predict the fracture of 70 mm thick surface notched wide plates with a yield strength of 500 MPa.
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