PSI - Issue 19

Kai Schnabel et al. / Procedia Structural Integrity 19 (2019) 442–451 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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concepts and the dimensioning of AM components have to deal with these challenges. With the use of standard guidelines, which are originally not intended for AM components, the fatigue strength of AM components can be critical overestimate in stress, when the nominal input CAD geometry is used for the assessment. This is risky, because of the fact that at the moment no recommendations for the assessment of AM components are available and the use of standard guidelines is without alternative, in particular if the special characteristics of AM components are known. In addition, the manufacturing processes is designed for the purpose of a direct creation of components from a CAD geometry. A fatigue assessment based on the input CAD geometry is not recommended, if the alignment with the real geometry has not been verified. For a better accuracy, besides a better understanding of the process and the correlations between the process parameters and the emerging AM structures, new modelling and assessment concepts are indispensable. One way could be the use of structural elements, which are able to represent the influence of defects respectively imperfections and other properties of AM structures, while they are applicable in an industrial context, because additional calculation time is just needed for the setup of a structural element toolbox. The main finite element calculation and assessment time of the AM component will be similar to more complex calculations such as composite structures than to isotropic metallic structures. The derivation of complex modelling techniques and assessment approaches always needs a big database and a validation process. Current and future research has to deal with the special issues and properties of components provided by additive manufacturing process, especially the LPBF. The correlations between the key process parameters and the emerging AM structures have to be identified. The AM processes have to be adapted for cyclic loaded structures and necessary data must be recorded during the process for the correlations. Following guidelines and standards have to be developed, which are able to deal with all aspects of AM structures by investigating and including all relevant AM process characteristics. Acknowledgements The research and development project “VariKa” that forms the basis for this report is funded within the scope of the “PAiCE Digitale Technologien für die Wirtschaft” technology programme run by the Federal Ministry for Economic Affairs and Energy and is managed by the DLR project management agency „Gesellschaft, Innovation, Technologie Informationstechnologi en/Elektromobilität“ at the German Aerospace Center in Cologne. The author is responsible for the content of this publication. Bagehorn, S., J. Wehr, und H. J. Maier. „Application of mechanical surface finishing processes for roughness reduction and fatigue improvement of additively manufactured Ti-6Al- 4V parts.“ International Journal of Fatigue (Elsevier BV) 102 (9 2017): 135-142. Blinn, Bastian, Marcus Klein, Christopher Gläßner, Marek Smaga, Jan Aurich, und Tilmann Beck . „An Investigation of the Microstructure and Fatigue Behavior of Additively Manufactured AISI 316L Stainless Steel with Regard to the Influence of Heat Treatment.“ Metals (MDPI AG) 8 (3 2018): 220. Brandao, Ana D., Johannes Gumpinger, Michael Gschweitl, Christoph Seyfert, Peter Hofbauer, und Tommaso Ghidini. „Fatigue Properties Of Additively Manufactured AlSi10Mg – Surface Treatment Effect.“ Procedia Structural Integrity (Elsevier BV) 7 (2017): 58-66. Hobbacher, A. F. Recommendations for fatigue design of welded joints and components. Springer International Publishing, 2016. Konecna, R., G. Nicoletto, S. Fintova, und M. Frkintova. „As - built surface layer characterization and fatigue behavior of DMLS Ti6Al4V.“ Procedia Structural Integrity (Elsevier BV) 7 (2017): 92-100. O'Regan, Paul, Paul Prickett, Rossi Setchi, Gareth Hankins, und Nick Jones. „Metal Based Additive Layer Manufacturing: Variat ions, Correlations and Process Control.“ Procedia Computer Science (Springer Fachmedien Wiesbaden) 96 (5 2016): 216-224. Rennert, Ronald, Eckehard Kullig, Michael Vormwald, Alfons Esderts, und Dieter Siegele. „FKM Guideline - Analytical strength assessment of components.“ 2013. Scurria, M., B. Möller, R. Wagener, und T. Melz. „Effect of the Surface Finish on the Cyclic Behavior of Additively Manufactured AlSi10Mg.“ TMS 2019 – 148th Annual Meeting \& Exhibition. 2019. Siddique, Shafaqat, Muhammad Imran, Eric Wycisk, Claus Emmelmann, und Frank Walther. „Influence of process -induced microstructure and 7. Outlook References