The Local Approach to Fracture Strength Evaluation of Welded Joints
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Fracture mechanics test results for welded joints should be handled with attention to the mechanical and metallurgical inhomogeneity in welds. This paper develops the procedure for fracture strength evaluation of welded joints based on the Local approach. The Weibull stress, consisting of a local stress in a specific region responsible for fracture initiation, was employed as a fracture driving force for welds. It was demonstrated that the critical Weibull stress at fracture initiation is independent of the strength mis-match condition near the notch tip. Transferability of fracture toughness results to fracture performance evaluation of welded joints was also confirmed through the analysis of the Weibull stress. As a new assertion, fracture toughness requirement based on the Local approach has been proposed. This is characterized by the equivalent CTOD concept, which provides a compatible Weibull stress between the toughness specimen and the structural component. The new procedure quantifies the fracture toughness requirement to meet a design solution of the structural component.
- Transactions of JWRI
Transactions of JWRI 25(2), 89-108, 1996-12