Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 3: Mechanical Properties I
MM 3.4: Vortrag
Montag, 23. März 2009, 11:15–11:30, IFW B
Effect of residual stresses on fatigue crack propagation of friction stir welded joints — Torben Fischer1, •Peter Staron1, Jorge dos Santos1, Yu-E Ma2, and Andreas Schreyer1 — 1GKSS Research Centre, Max-Planck-Str. 1, 21502 Geesthacht, Germany — 2Cranfield University, Cranfield Bedfordshire, MK43 0AL, United Kingdom
Friction stir welding (FSW) is a proven technology for use in airframes. FSW is now seen as a key element for producing cost effective integral metallic structures in future airframe applications. By further understanding and development of the FSW process new applications can be realized leading to further cost and weight benefits for metallic airframe structures, which will make these structures more competitive in the future. Of particular importance is the understanding of the effect of residual stress on the performance of the welded components. In order to investigate the influence of the sample dimensions on maximum residual stresses and fatigue crack growth, fatigue test samples with different sizes of a batch of friction stir welded AA 2195 sheets were tested. A crack-initiating notch was inserted perpendicular to the weld line on the advancing side of the weld. Residual stress measurements have been carried out with the neutron diffractometer ARES-2 at Geesthacht Neutron Facility (GeNF). First results show that the residual stresses depend strongly on the specimen size and that the fatigue crack propagation speed depends on the residual stress state.