By K Macdonald
The failure of any welded joint is at top inconvenient and at worst may end up in catastrophic injuries. Fracture and fatigue of welded joints and structures analyzes the methods and factors of fracture and fatigue, targeting how the failure of welded joints and buildings could be estimated and minimized within the layout process.
Part 1 concentrates on examining fracture of welded joints and constructions, with chapters on constraint-based fracture mechanics for predicting joint failure, fracture evaluate equipment and using fracture mechanics within the fatigue research of welded joints. partly 2, the emphasis shifts to fatigue, and chapters specialise in numerous points of fatigue research together with evaluation of neighborhood stresses in welded joints, fatigue layout ideas for welded constructions, k-nodes for offshore constructions and modeling residual stresses in predicting the provider lifetime of structures.
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Additional info for Fracture and fatigue of welded joints and structures
G. the J integral, and to quantify the deviation of the actual stress field (normally taken from numerical simulation) from the stress field predicted using J and the Hutchinson, Rice, Rosengren (HRR) field alone. This loss of constraint is readily quantified either directly or indirectly by a second single parameter (the first being J) which in general is dependent upon both geometry and material properties. 3 Strain-based FAD (Budden, 2006). , 1993). The first of these orders different geometries by ranking their T stress values, while the remaining two parameters aim to directly quantify the stress field in the elastic-plastic material ahead of the crack tip.
Wide-ranging international research efforts examined a number of the issues surrounding pipeline ECAs including fracture toughness, tensile properties, misalignment (wall thickness tolerances and ovality); but it is the work on experimental measurement of fracture toughness and the importance of geometry constraint that is the focus of this chapter. 2 High strains Axial plastic strain has an impact on girth weld flaw tolerance – particularly if cyclic in nature – which is in general lowered in comparison with elastic loading.
A. indd 55 3/23/11 1:43:08 PM 56 Fracture and fatigue of welded joints and structures Macdonald, K. A. , 2008, ‘Engineering critical assessment of thin-wall offshore pipelines’, Paper IPC2008–64188, International Pipeline Conference, Calgary, Canada, 30 September – 3 October McClintock, F. , Gioielli, P. , Macia, M. , Biery, N. E. and Kan, W. , Zhang, Z. , Loria, M. P. and Ørjasæter, O. , Knagenhjelm, H. , Black, S. and Røstadsand, P. P. , 1991, ‘Family of crack-tip fields characterised by a triaxiality parameter – I.