Moritz Braun, Dr., is the head of the department for ship reliability at the German Aerospace Center of Maritime Energy Systems in Geesthacht, Germany. He holds a B.Sc. in mechanical engineering (2012), an M.Sc. in Marine Technology (2014) and a Doctor of Engineering (2021). For his doctoral thesis, he received the Curt Bartsch Award of the German Society for Maritime Technology. His research focuses on the structural integrity assessment of large engineering structures and in particular on fatigue and fracture mechanics. He has about 70 publications in the corresponding fields. He is the delegate of the German Welding Association (DVS) at the International Institute of Welding (IIW) in ‘Commission XV: Design, Analysis, and Fabrication of Welded Structures’, the German representative in the International Ship and Offshore Structures Congress (ISSC) technical committee ‘V.7 Structural Assessment During Operations’, and the deputy chairman of the working group ‘Damages of Ship Structures’ of DVS.
AbstractAdditive manufacturing (AM) has seen a rapid increase in application for many applications in recent years; nevertheless, there are still technical limitation with respect to widespread industrial applications. One important aspect is the relative limited building volume of the laser powder bed fusion (LPBF) process. Thus, the joining of AM parts makes it possible to increase the volume of AM structures; however, there are currently only a few investigations on the fatigue strength of welded AM parts. In this study, local fatigue assessment methods are applied to assess the fatigue strength of butt-welded joints of 316L AM steel plates made by gas metal arc welding. To account, for the different weld seam position relative to the LBPF building process, joints were produced with weld seams parallel and vertical to the layer orientation of AM plates. For fatigue assessment, local concepts based on the micro-structural support effect hypothesis are selected. This includes the stress averaging, the critical distance, and the IBESS approach.
|Room 6||Wednesday 29th November||11:15-11:45||Moritz Braun|
S01-1 Additive manufacturing
2 - Local fatigue assessment of butt-welded joints between additively manufactured 316L stainless steel parts