A new approach to estimate the structural stress for the assessment of the multiaxial fatigue strength of welded joints is proposed. A review of the fatigue strength of structur al materials A review of some recent data from multiaxial fatigue data from different notched materials is carried out in the paper. The approach based on the strain energy density (SED) averaged over a control volume is first used to summarise uniaxial and multiaxial fatigue strength data of welded joints made of structural steel and aluminium alloys.
In this paper, an new stress estimation approach for the multiaxial fatigue strength assessment of complex welded joints is proposed, in which an equivalent hot spot stress is defined at a point Fatigue Assessment Of Welded Joints By Local Fatigue Assessment of Welded Joints by Local Approaches For the fatigue strength assessment of welded joints, the transverse residual stress is of interest because it is normal to the potential fatigue cracks originated from the weld toe if the joints are transversely loaded. Fatigue crack initiation assessment of welded joints Fatigue assessment of welded joints by local approachesSpecial formulae for multiaxial fatigue 212 5.2.4 Assessment procedure 213 5.3 Demonstration examples 214 5.3.1 Fatigue life of stress-relieved butt-welded joints 214 5.3.2 butt-welded joints with residual stresses 217 5.3.3 fillet-welded cruciform joints221 5.3.4 welded containment detail224 5.3.5 strength of welded tubular joint 227 6
Fatigue is a major cause of failure, particularly in welded structures, reflecting the inherently poor fatigue performance of many welded joints ( Fig.1).This emphasises the need for due consideration of potential fatigue failure at the design stage, and for clear design guidance. In fact, considerable effort has gone into the production or revision of fatigue design rules in recent years, particularly in the European Union in Fatigue of Multiaxial Load-Carrying Fillet Welded Joints - TWIFatigue design rules for welded steel joints are based on fatigue test results for simple plate specimens subjected to axial tension loading. The resulting stress cycle is nominally uniaxial, with a constant principal stress direction which is normally parallel or perpendicular to the weld. Fatigue strength of laser-stake welded T-joints subjected Mar 16, 2016 · Particularly the fatigue assessment of multiaxially loaded laser-stake welds, as they occur in the all-steel sandwich panels, is uncertain and probably too conservative in the design practice. The fatigue tests and local stress evaluation described in the following may serve as basis for a more reliable fatigue life assessment.
In reality most welded components are loaded with a combination of different variable forces and moments that often cause a state of multiaxial stress in the fatigue-critical areas. If the Interim fatigue design recommendations for fillet welded Dec 21, 2001 · Alberto Campagnolo, Michael Vormwald, Ehsan Shams, Giovanni Meneghetti, Multiaxial fatigue assessment of tube-tube steel joints with weld ends using the peak stress method, International Journal of Fatigue, 10.1016/j.ijfatigue.2020.105495, (105495), (2020). Multiaxial fatigue assessment of welded connections in The multiaxial fatigue assessment using the critical plane approach has led to a higher damage, and the SN curve approach is the method which calculates lesser damage in the critical weld. The reason of this outcome might be due to the fact that the conventional SN curve approach for non-proportional variable amplitude railway traffic loading gives single stress cycle for each train pass.
Sep 03, 2014 · Recent developments and future challenges in fatigue strength assessment of welded joints Show all authors. Wolfgang Fricke. Wolfgang Fricke. See all articles by this author. Search Google Scholar for this author. multiaxial stress states, welding-induced distortions and residual stresses. Finally, ways of improving the fatigue behaviour of Recent developments and future challenges in fatigue challenges in fatigue strength assessment of welded joints Wolfgang Fricke Abstract Fatigue is an important design criterion for welded structures subjected to cyclic loading. Several approaches for fatigue strength assessment have been developed which are either based on Woehler SN curves and damage accumulation rule or on crack propagation Review on fatigue life prediction models of welded jointTherefore, fatigue assessment of welded joint is indispensable for the safety evaluation of entire welded structures used in the engineering fields including the high-speed train, civil engineering, chemo-mechanical engineering and ocean engineering ones.
Jun 01, 2014 · A new approach to estimate the structural stress for the assessment of the multiaxial fatigue strength of welded joints is proposed. In this approach, the structural stress at a point just below the weld toe in the plate thickness direction is evaluated and adopted for the multiaxial fatigue strength assessment of complex welded joints in combination with the Modified Wöhler Curve