• Eichlseder, W.
• Stoschka, Michael
• Fössl, T.
• Schörghuber, M.

Abstract

<p>In order to create light weight structures in industry, not only high strength materials may be used, but optimization of topology of the design space may also be applied. These procedure often lead to complex structures of high stiffness requiring local fatigue strengths of single- and multi-layer seams accordingly. To calculate the fatigue behaviour of welded structures using the global structural stress approach, the plane RlMS-concept is commonly used. Furthermore, the local stress / strain approach or fracture mechanical methods support calculation of local fatigue strength. These extensive local fatigue approaches are especially useful for finishes of seams. The notch radius at the weld toe, the residual stress state and the material behaviour in the heat-affected-zone determine the local fatigue life in a major way. These parameters depend on the settings of the arc welding process. The influence of varying arc automated welding procedures is investigated by experimental tests and simulation. Both, hand-welded and manipulator welded specimen plates were tested, metallographically investigated and finally compared for assessment of their lifetime. The goal of the present work is to determine the main factors influencing and interacting thermo-mechanical submodelling and structural stress approach for assessing fatigue life. Damage parameters, which depict the arc welding process locally, will be assembled and superimposed to the structural stress approach.</p>

Topics

• impedance spectroscopy
• simulation
• strength
• fatigue