The multiaxial weld root fatigue of butt welded joints subjected to uniaxial loading. Issue 10 (1st April 2016)

• Record Type: Journal Article
• Authors: Khurshid, M.; Barsoum, Z.; Barsoum, I.; Däuwel, T.
• Is Part Of: Fatigue & fracture of engineering materials & structures. Volume 39:Issue 10(2016:Oct.)
• Page Start: 1281
• Page End: 1298
• Publication Date: 2016-04-01
• Subjects: fatigue strength -- multiaxial stress ratio -- multiaxial stress state -- welded joints -- weld inclination; Materials -- Fatigue -- Periodicals; Fracture mechanics -- Periodicals; 620.1123
• DOI: 10.1111/ffe.12444
• Languages: English
• ISSNs: 8756-758X

Abstract

Abstract: In this study, the fatigue strength of inclined butt welds subjected to a proportional multiaxial stress state generated by uniaxial loading is studied in nominal and local stress concepts. The local methodologies studied included principal stress hypothesis, von Mises stress hypothesis and modified Wöhler curve method. Nominal methodologies included modified Gough–Pollard interaction equation, the design equation in Eurocode3 and the interaction equation in DNV standard. Results are evaluated along with data published in relevant literature. It is observed that both local and nominal stress assessment methods are able to estimate multiaxial fatigue strength. No obvious difference in fatigue strength is observed in the nominal stress concept, but the notch stress concept is able to capture a decrease in fatigue strength in shear‐dominated joints. It is concluded that modified Wöhler curve method is a suitable tool for the evaluation of fatigue strength in joints dominated by both normal and shear stresses.