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Scientific Assistant

M.Sc. Felix Stern

Main activities

  • Laboratory servohydraulic fatigue testing systems
  • Electromagnetic micro fatigue testing system
  • Rotation bending fatigue testing system
  • Pendulum Impact Test system

Overview of research projects in group Additive Manufacturing

Curriculum Vitae

Memberships and committees

Publications and presentations

17) Kotzem, D.; Kleszczynski, S.; Stern, F.; Elspaß, A.; Tenkamp, J.; Witt, G.; Walther, F.:
Impact of single structural voids on fatigue properties of AISI 316L manufactured by laser powder bed fusion.
International Journal of Fatigue 148, 106207 (2021) 1-10. https://doi.org/10.1016/j.ijfatigue.2021.106207

16) Doñate-Buendia, C.; Kürnsteiner, P.; Stern, F.; Wilms, M.B.; Streubel, R.; Kusoglu, I.M.; Tenkamp, J.; Bruder, E.; Pirch, N.; Barcikowski, S.; Durst, K.; Schleifenbaum, J.H.; Walther, F.; Gault, B.; Gökce, B.:
Microstructure formation and mechanical properties of ODS steels built by laser additive manufacturing of nanoparticle coated iron-chromium powders.
Acta Materialia 206, 116566 (2021) 1-15. https://doi.org/10.1016/j.actamat.2020.116566

15) Stern, F.; Lüneburg, B.; Rollmann, J.; Pape, F.; Pantke, K.; Awd, M.; Tenkamp, J.; Walther, F.:
Evaluation of the influence of non-metallic inclusions on the high and very high cycle fatigue life of inductive hardened bearing steel in multi-megawatt wind turbines.
International Bearing Conference, Proceedings of Bearing World 2020 (2020) 67-70.

14) Doñate-Buendia, C.; Streubel, R.; Kürnsteiner, P.; Wilms, M. B.; Stern, F.; Tenkamp, J.; Bruder, E.; Barcikowski, S.; Gault, B.; Durst, K.; Schleifenbaum, J. H.; Walther, F.; Gökce, B.:
Effect of nanoparticle additivation on the microstructure and microhardness of oxide dispersion strengthened steels produced by laser powder bed fusion and directed energy deposition.
Procedia CIRP 94 (2020) 41-45. https://doi.org/10.1016/j.procir.2020.09.009 - Download

13) Boes, J.; Röttger, A.; Theisen, W.; Cui, C.; Uhlenwinkel, V.; Schulz, A.; Zoch, H.-W.; Stern, F.; Tenkamp, J.; Walther, F.:
Gas atomization and laser additive manufacturing of nitrogen-alloyed martensitic stainless steel.
Additive Manufacturing (2020) 101379 1-12. https://doi.org/10.1016/j.addma.2020.101379

12) Stern, F.; Grabienski, F.; Walther, F.; Boes, J.; Röttger, A.; Theisen, W.:
Influence of powder nitriding on the mechanical behavior of laser-powder bed fusion processed tool steel X30CrMo7-2.
Materials Testing 32 (2020) 1, 19-26. https://doi.org/10.3139/120.111446 - Download

11) Stern, F.; Tenkamp, J.; Walther, F.:
Non-destructive characterization of process-induced defects and their effect on the fatigue behavior of austenitic steel 316L made by laser-powder bed fusion.
Progress in Additive Manufacturing 5 (2020) 287-294. https://doi.org/10.1007/s40964-019-00105-6

10) Kotzem, D.; Stern, F.; Walther, F.:
Bestimmung quasistatischer Druckeigenschaften bei Raum- und Hochtemperatur an additiv gefertigten Miniaturproben.
Additive Fertigung von Bauteilen und Strukturen. Springer Vieweg, ISBN 978-3-658-27411-5 (2019) 145-156. https://doi.org/10.1007/978-3-658-27412-2_9

9) Zoch, H.-W.; Uhlenwinkel, V.; Schulz, A.; Cui, C.; Theisen, W.; Röttger, A.; Boes, J.; Walther, F.; Tenkamp, J.; Stern, F.:
High-alloyed steel powders with increased nitrogen content for laser additive manufacturing.
Proceedings of the 11th International Conference on Tooling (2019) 1-8.

8) Stern, F.; Kleinhorst, J.; Tenkamp, J.; Walther, F.:
Investigation of the anisotropic cyclic damage behavior of selective laser melted AISI 316L stainless steel.
Fatigue and Fracture of Engineering Materials and Structures 42 (2019) 2422-2430. https://doi.org/10.1111/ffe.13029

7) Stern, F.; Kleinhorst, J.; Tenkamp, J.; Walther, F.:
Einfluss der Baurichtung beim selektiven Laserschmelzen (SLM) auf das Ermüdungsverhalten des austenitischen Stahls AISI 316L.
3. Tagung des DVM-AK Additiv gefertigte Bauteile und Strukturen, Hrsg.: H.-A. Richard, DVM e.V., ISSN 2509-8772 (2018) 49-56.

6) Awd, M.; Stern, F.; Kampmann, A.; Kotzem, D.; Tenkamp, J.; Walther, F.:
Microstructural characterization of the anisotropy and cyclic deformation behavior of selective laser melted AlSi10Mg structures.
Metals 8 (10), 825 (2018) 1-14. https://doi.org/10.3390/met8100825 - Download

5) Wilms, M. B.; Streubel, R.; Frömel, F.; Weisheit, A.; Tenkamp, J.; Walther, F.; Barcikowski, S.; Schleifenbaum, J. H.; Gökce, B.:
Laser additive manufacturing of oxide dispersion strengthened steels using laser-generated nanoparticle-metal composite powders.
Procedia CIRP 74 (2018) 196-200. https://doi.org/10.1016/j.procir.2018.08.093

4) Frömel, F.; Kleinhorst, J.; Tenkamp, J.; Walther, F.:
Influence of process-induced anisotropy and defects on the fatigue behavior of additively manufactured austenitic steel 316L.
NT2F18, Proceedings of the 18th International Conference on New Trends in Fatigue and Fracture, Ed.: L. Reis, M. Freitas, V. Anes, ISBN 978-989-20-8548-7 (2018) 189-192.

3) Doñate-Buenida C.; Frömel, F.; Wilms, B.; Streubel, R.; Tenkamp, J.; Hupfeld, T.; Nachev, M.; Gökce, E.; Weisheit, A.; Barcikowski, S.; Walther, F.; Schleifenbaum, J. H.; Gökce, B.:
Oxide dispersion-strengthened alloys generated by laser metal deposition of laser-generated nanoparticle-metal powder composites.
Materials & Design 154 (2018) 360-369. https://doi.org/10.1016/j.matdes.2018.05.044

2) Frömel, F.; Awd, M.; Tenkamp, J.; Walther, F.; Boes, J.; Geenen, K.; Röttger, A.; Theisen, W.:
Untersuchung des Einflusses einer HIP-Nachbehandlung auf den selektiv lasergeschmolzenen (SLM) austenitischen Stahl AISI 316L.
Werkstoffe und Additive Fertigung - Tagungsband, Hrsg: P. Hoyer, C. Leyens, T. Niendorf, V. Ploshikhin, V. Schulze, G. Witt, ISBN 978-3-88355-418-1 (2018) 190-199.

1) Frömel, F.; Kampmann, A.; Tenkamp, J.; Walther, F.:
Einfluss der prozessinduzierten ortsabhängigen Fehlstellenverteilung auf die Strukturintegrität laseradditiv gefertigter AlSi10Mg- und AlSi12-Legierungen.
Werkstoffprüfung 2017 - Fortschritte in der Werkstoffprüfung für Forschung und Praxis, Hrsg.: H. Frenz, J. B. Langer, Stahleisen, ISBN 978-3-9814516-7-2 (2017) 135-140.

 

List of all publications

18) Stern, F. (V.); Grabowski, J.; Kleszczynski, S.; Kotzem, D.; Elspaß, A.; Witt, G.; Walther, F.:
Influence assessment of artificial defects on the fatigue behavior of additively manufactured stainless steel 316LVM.
ICSI2021, Virtual 4th International Conference on Structural Integrity, Web Conference, 30. Aug.-01. Sept. (2021).

17) Awd, M. (V.); Stern, F.; Kotzem, D.; Tenkamp, J.; Walther, F.:
Microstructure-based assessment and modeling of fatigue evolution and damage in additive manufactured metals.
ASTM ICAM 2020, ASTM International Conference on Additive Manufacturing, Web Conference, 16.-20. Nov. (2020).

16) Stern, F. (V.); Lüneburg, B.; Rollmann, J.; Pape, F.; Pantke, K. (V.); Awd, M.; Tenkamp, J.; Walther, F.:
Evaluation of the influence of non-metallic inclusions on the high and very high cycle fatigue life of inductive hardened bearing steel in multi-megawatt wind turbines.
Bearing World 2020, International Bearing Conference, Web Conference, 19.-23. Oct. (2020).

15) Awd, M. (V.); Stern, F.; Kotzem, D.; Tenkamp, J.; Walther, F.:
Multiscale experimental assessment and model-based correlation of fatigue damage evolution in additively manufactured metals.
MSE 2020, Materials Science and Engineering, Darmstadt, 23.-25. Sept. (2020).

14) Doñate Buendia, C.; Streubel, R.; Kürnsteiner, P.; Wilms, M. B.; Stern, F.; Tenkamp, J.; Bruder, E.; Barcikowski, S.; Gault, B.; Durst, K.; Schleifenbaum, J. H.; Walther, F.; Gökce, B. (V.):
Effect of nanoparticle additivation on the microstructure and microhardness of oxide dispersion strengthened steels produced by laser powder bed fusion and directed energy deposition.
LANE 2020, 11th CIRP Conference on Photonic Technologies, Web Conference, 07.-09. Sept. (2020).

13) Stern, F. (V.) ; Kotzem, D.; Walther, F.:
Advanced characterization techniques for fatigue life estimation of additively manufactured metal samples and complex geometries.
FDMD2020 - Fatigue Design and Material Defects, Web Conference, 26.-28. May (2020).

12) Stern, F. (V.); Boes, J.; Cui, C.; Schulz, A.; Röttger, A.; Uhlenwinkel, A.; Zoch, H.-W.; Theisen, W.; Walther, F.:
Improvement of mechanical strength in additively manufactured nitrogen alloyed steels.
TMS 2020 Annual Meeting & Exhibition, San Diego, CA, USA, 23.-27. Febr. (2020).

11) Stern, F. (V.); Boes, J.; Röttger, A.; Tenkamp, J.; Theisen, W.; Walther, F.:
Charakterisierung des Einflusses eines erhöhten Stickstoffgehalts auf das Ermüdungsverhalten des mittels Laser-Powder Bed Fusion hergestellten Stahls X2CrNiMo17-12-2.
DGM/DVM-AG Materialermüdung, Universität Siegen, Siegen, 24.-25. Okt. (2019).

10) Boes, J. (V.); Röttger, A.; Becker, L.; Theisen, W.; Uhlenwinkel, V.; Schulz, A.; Zoch, H.-W.; Stern, F.; Tenkamp, J.; Walther, F.:
Verarbeitung stickstoffhaltiger austenitischer Stahlpulver mittels L-PBF - Pulveraufbereitung, Gefüge und Eigenschaften.
Werkstoffwoche 2019, Dresden, 18.-20. Sept. (2019).

9) Stern, F. (V.); Grabienski, F.; Tenkamp, J.; Walther, F.; Boes, J.; Röttger, A.; Theisen, W.; Schulz, A.; Uhlenwinkel, V.; Zoch, H.-W.:
Einfluss des Pulveraufstickens auf die Werkstoffeigenschaften des mittels Laser-powder bed fusion (L-PBF) hergestellten Werkzeugstahls X30CrMo7-2.
Werkstoffwoche 2019, Dresden, 18.-20. Sept. (2019).

8) Stern, F. (V.); Tenkamp, J.; Walther, F.:
Non-destructive characterization of process induced defects and its effect on the fatigue behavior of SLM-processed 316L SS.
ACEX 2019 - 13th International Conference on Advanced Computational Engineering and Experimenting, Athens, Greece, 01.-05. July (2019).

7) Zoch, H.W.; Uhlenwinkel, V.; Schulz, A. (V.); Cui, C.; Theisen, W.; Röttger, A.; Boes, J.; Walther, F.; Tenkamp, J.; Stern, F.:
High-alloyed steel powders with increased nitrogen content for laser additive manufacturing.
Tooling2019, 12.-16. Mai (2019).

6) Siddique, S.; Awd, M.; Stern, F.; Tenkamp, J. (V.); Walther, F.:
Effect of microstructure and internal defects on the cyclic deformation and damage behavior in additively (SLM) manufactured Al-Si alloys.
TMS 2019 Annual Meeting & Exhibition, San Antonio, TX, USA, 10.-14. Mar. (2019).

5) Stern, F. (V.); Tenkamp, J.; Walther, F.:
Correlation of X-ray CT results for defect characterization with the fatigue behavior of 316L specimens processed by laser powder-bed fusion.
Joint German-Swedish Spring Meeting on Basic and Industrial Aspects of Materials Fatigue (DGM/DVM/UTMIS), HAW Hamburg, Hamburg, 07.-08. März (2019).

4) Stern, F. (V.); Kleinhorst, J.; Tenkamp, J.; Walther, F.:
Einfluss der Baurichtung beim selektiven Laserschmelzen (SLM) auf das Ermüdungsverhalten des austenitischen Stahls AISI 316L.
3. Tagung des DVM-AK Additiv gefertigte Bauteile und Strukturen, Berlin, 07.-08. Nov. (2018).

3) Wilms, M.B.; Streubel, R.; Frömel, F.; Weisheit, A.; Tenkamp, J.; Walther, F.; Barcikowski, S.; Schleifenbaum, J.H.; Gökce, B. (V.):
Laser additive manufacturing of oxide dispersion strengthened steels using laser-generated nanoparticle-metal composite powders.
LANE 2018, 10th CIRP Conference on Photonic Technologies, Fürth, 03.-06. Sept. (2018).

2) Frömel, F. (V.); Kleinhorst, J.; Tenkamp, J.; Walther, F.:
Influence of process-induced anisotropy and defects on the fatigue behavior of additively manufactured austenitic steel 316L.
NT2F18, 18th International Conference on New Trends in Fatigue and Fracture, Lisbon, Portugal, 17.-20. July (2018).

1) Frömel, F. (V.); Kampmann, A.; Tenkamp, J.; Walther, F.:
Einfluss der prozessinduzierten ortsabhängigen Fehlstellenverteilung auf die Strukturintegrität laseradditiv gefertigter AlSi10Mg- und AlSi12-Legierungen.
Werkstoffprüfung 2017, Berlin, 30. Nov.-01. Dez. (2017).

 

List of all presentations

Location & approach

The campus of TU Dort­mund University is located close to interstate junction Dort­mund West, where the Sauerlandlinie A45 (Frankfurt-Dort­mund) crosses the Ruhrschnellweg B1/A40. The best interstate exit to take from A45 is "Dort­mund-Eichlinghofen (6)" (closer to Campus Süd), and from B1/A40 "Dort­mund-Barop (44)" (closer to Campus Nord). Signs for the uni­ver­si­ty are located at both exits. Follow the signs towards Campus-Süd.

The Department of Materials Test Engineering (WPT) is located in the "Maschinenbau III" building, which can be reached via entrance 41, where parking spaces are available. The secretariat is located on the third floor in E 03 - room 3.027.

For the approach to the TU Dort­mund University you will find the navigation on Google Maps.

Address for navigation devices:

Baroper Straße 303

D-44227 Dortmund

Germany

TU Dort­mund University has its own train station ("Dort­mund Uni­ver­si­tät"). From there, suburban trains (S-Bahn) leave for Dort­mund main station ("Dort­mund Hauptbahnhof") and Düsseldorf main station via the "Düsseldorf Airport Train Station" (take S-Bahn number 1). The uni­ver­si­ty is easily reached from Bochum, Essen, Mülheim an der Ruhr and Duisburg. From there, Campus Süd, where the Department of Materials Test Engineering (WPT) is located, can be reached in five minutes via the H-Bahn in the direction of "Eichlinghofen" or "Campus Süd".

After leaving the H-Bahn station "Campus Süd" cross the small street and go straight forward. Take the stairs (elevator on the left side).
Turn right directly under the canopy, go approximately 200 m, the Building "Maschinenbau III" is at the end of the path.

The office is located on the third floor in E03 - room 3.027.

Dortmund's public transport company DSW21 offers an interactive route network map with timetable information.

The AirportExpress is a fast and convenient means of transport from Dort­mund Airport (DTM) to Dort­mund Central Station, taking you there in little more than 20 minutes. From Dort­mund Central Station, you can continue to the uni­ver­si­ty campus by interurban railway (S-Bahn). A larger range of in­ter­na­tio­nal flight connections is offered at Düsseldorf Airport (DUS), which is about 60 kilometres away and can be directly reached by S-Bahn from the uni­ver­si­ty station.

The H-Bahn is one of the hallmarks of TU Dort­mund University. There are two stations on Campus Nord. One ("Dort­mund Uni­ver­si­tät S") is directly located at the suburban train stop, which connects the uni­ver­si­ty directly with the city of Dort­mund and the rest of the Ruhr Area. Also from this station, there are connections to the "Technologiepark" and (via Campus Süd) Eichlinghofen. The other station is located at the dining hall at Campus Nord and offers a direct connection to Campus Süd every five minutes.

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