Fatigue strength of laser beam welded thin steel structures under multiaxial loading

• Published in: International journal of fatigue Vol. 28; no. 5; pp. 657 - 662
• Main Authors: Sonsino, C.M., Kueppers, M., Eibl, M., Zhang, G.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2006; Elsevier Science
• Subjects: Applied sciences; Axial; Combined loading; Exact sciences and technology; Fatigue; Fictitious notch radius; Finite element modelling; Joining, thermal cutting: metallurgical aspects; Laser beam welds; Local stress concept; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Multiaxial fatigue; Structural steel; Torsion; Welding; Local stress concept; Axial; Finite element modelling; Fictitious notch radius; Laser beam welds; Combined loading; Structural steel; Multiaxial fatigue; Torsion; Metallic structure; Mechanical properties; Fatigue; Multiaxial load; Modeling; Laser welding; Finite element method; Welded joint; Fatigue strength; Strength
• ISSN: 0142-1123; 1879-3452
• DOI: 10.1016/j.ijfatigue.2005.09.013

The multiaxial fatigue behaviour of thin laser beam welded tube–tube specimens of the structural steel St35 was assessed according to the methodology of the fictitious weld root radius of r f=0.05 mm and the application of the Effective Equivalent Stress Hypothesis (EESH), especially considering the fatigue life reducing influence of out-of-phase loading in comparison to in-phase loading. The results are applicable for the fatigue design of laser beam welded car body and chassis structures of thin steel sheets ( t<3 mm).