By K Macdonald
The failure of any welded joint is at top inconvenient and at worst can result in catastrophic injuries. Fracture and fatigue of welded joints and structures analyzes the techniques and motives of fracture and fatigue, concentrating on how the failure of welded joints and constructions should be anticipated and minimized within the layout process.
Part 1 concentrates on interpreting fracture of welded joints and constructions, with chapters on constraint-based fracture mechanics for predicting joint failure, fracture review tools and using fracture mechanics within the fatigue research of welded joints. partly 2, the emphasis shifts to fatigue, and chapters specialise in quite a few elements of fatigue research together with overview of neighborhood stresses in welded joints, fatigue layout principles for welded buildings, k-nodes for offshore constructions and modeling residual stresses in predicting the carrier lifetime of structures.
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Extra info for Fracture and fatigue of welded joints and structures
Jayadevan, K. R. , O’Dowd, N. P. and Howard, B. , 2007, ‘Comparison of crack driving force estimation schemes for weld defects in reeled pipelines’, Proceedings of ISOPE 2007, International Offshore and Polar Engineering Conference, Lisbon, Portugal Tyson, W. R, Shen, G. , Horsley, D. , 2006, ‘A quantitative approach to tensile strain capacity of pipelines’, Proceedings of IPC 2006, International Pipeline Conference, American Society of Mechanical Engineers, Calgary, Canada Wästberg, S. Pisarski, H.
16), and crack depth in SENT specimens has insignificant effect on the measured CTOD-R curves. These findings demonstrate that the fracture toughness from SENT specimens gives a measure for ductile materials suitable for application to a much wider range of crack depths in pipes than earlier assumed. Fracture toughness from SENT specimens is also insensitive to crack depth. Turning to the effect of internal pressure and biaxial stresses, the FE simulations of cracked pipes with the Gurson model showed no influence of biaxial stress on the CTOD–R curves.
Specimens were notched from the internal pipe surface to a range of depths. The clamping separation distance for the SENT specimens was 115 mm (based on 10W). All testing was performed at room temperature using a double clip gauge arrangement to calculate the CTOD values. CTOD–R curves were constructed using a multiple specimen technique whereby specimens were unloaded at different displacements (Fig. 11). 3 mm. 64 mm. 13, that the strain capacity in the test was strongly dependent on this difference in the initial crack depth.