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Scientific Assistant

M.Sc. Ramin Hajavifard

Main activities

  • Thermal sensor technology
  • Magneto-inductive sensor technology
  • Electromagnetic acoustic transducer (EMAT)
  • Modelling and simulation, finite element modelling (FEM)

Overview of research projects in group steels

Publications and presentations

10) Baak, N.; Hajavifard, R.; Lücker, L.; Rozo Vasquez, J.; Strodick, S.; Teschke, M.; Walther, F.:
Micromagnetic approaches for microstructure analysis and capability assessment.
Materials Characterization 178, 111189 (2021) 1-14. https://doi.org/10.1016/j.matchar.2021.111189

9) Hajavifard, R.; Afzal, M. J.; Möhring, K.; Buhl, J.; Walther, F.:
Characterisation of phase transformation and induced residual stresses in incrementally formed disc springs : an experimental and numerical study.
4. Symposium Materialtechnik, (2021) 1-15. https://doi.org/10.21268/20210518-0 - Download

8) Afzal, M. J.; Hajavifard, R.; Buhl, J.; Walther, F.; Bambach, M.:
Influence of process parameters on the residual stress state and properties in disc springs made by incremental sheet forming (ISF).
Forschung im Ingenieurwesen, (2021) 1-11. https://doi.org/10.1007/s10010-021-00491-w - Download

7) Maqbool, F.; Maaß, F.; Buhl, J.; Hahn, M.; Hajavifard, R.; Walther, F.; Tekkaya, A.E.; Bambach, M.:
Targeted residual stress generation in single and two point incremental sheet forming (ISF).
Archive of Applied Mechanics, (2021) 1-23. https://doi.org/10.1007/s00419-021-01935-z - Download

6) Hajavifard, R.; Maqbool, F.; Bambach, M.; Walther, F.:
Experimental and numerical studies on the use of incremental sheet forming to improve the austenitic disc spring characteristics through tailoring their microstructure and residual stress properties.
IRF 2020, Proceedings of the 7th International Conference on Integrity-Reliability-Failure, (2020) 247-258.

5) Afzal, M. J.; Maqbool, F.; Hajavifard, R.; Buhl, J.; Walther, F.; Bambach, M.:
Modeling the residual stresses induced in the metastable austenitic stainless steel disc springs manufactured by incremental sheet forming by a combined hardening model with phase transformation.
Procedia Manufacturing 47 (2020) 1410-1415. https://doi.org/10.1016/j.promfg.2020.04.300

4) Hajavifard, R.; Maqbool, F.; Schmiedt-Kalenborn, A.; Buhl, J.; Bambach, M.; Walther, F.:
Integrated forming and surface engineering of disc springs by inducing residual stresses by incremental sheet forming.
Materials 12 (10), 1646 (2019) 1-19. https://doi.org/10.3390/ma12101646 - Download

3) Maqbool, F.; Hajavifard, R.; Walther, F.; Bambach, M.:
Engineering the residual stress state of the metastable austenitic stainless steel (MASS) disc springs by incremental sheet forming (ISF).
Production Engineering Research and Development 13 (2019) 139-148. https://doi.org/10.1007/s11740-018-0864-6

2) Maqbool, F.; Hajavifard, R.; Walther, F.; Bambach, M.:
Experimental investigation and finite element modelling of residual stress control in disc springs made of metastable austenitic stainless steel (MASS) using incremental sheet forming (ISF).
Procedia Manufacturing 29 (2019) 12-20. https://doi.org/10.1016/j.promfg.2019.02.099

1) Awd, M.; Siddique, S.; Hajavifard, R.; Walther, F.:
Comparative study of defect-based and plastic damage-based approaches for fatigue lifetime calculation of selective laser-melted AlSi12.
FFW 2018, Proceedings of the 7th International Conference on Fracture Fatigue and Wear (2018) 297-313. https://doi.org/10.1007/978-981-13-0411-8_27

 

 

List of all publications

7) Hajavifard, R. (V.); Afzal, M. J.; Möhring, K.; Buhl, J.; Walther, F.:
Characterisation of phase transformation and induced residual stresses in incrementally formed disc springs - an experimental and numerical study.
4. Symposium Materialtechnik des Clausthaler Zentrums für Materialtechnik, Web-Konferenz, 25.-26. Febr. (2021).

6) Afzal, M. J. (V.); Maqbool, F.; Hajavifard, R.; Buhl, J.; Walther, F.; Bambach, M.:
Modeling the residual stresses induced in the metastable austenitic stainless steel disc springs manufactured by incremental sheet forming by a combined hardening model with phase transformation.
ESAFORM 2020, 23rd International Conference on Material Forming, Cottbus, Germany, 04.-08. May (2020).

5) Awd, M. (V.); Hajavifard, R.; Patsch, C.; Walther, F.:
Enhancing competence in materials testing education using digital methods.
The First Digital Learning Day, TU Dortmund University, Dortmund, 27. Nov. (2019).

4) Hajavifard, R. (V.); Maqbool, F.; Bambach, M.; Walther, F.:
Property improvement of austenitic disc springs through targeted adjustment of residual stresses by means of incremental sheet forming.
COMPLAS 2019, 15th International Conference on Computational Plasticity, Barcelona, Spain, 03.-05. Sept. (2019).

3) Maqbool, F. (V.); Hajavifard, R.; Walther, F.; Bambach, M.:
Experimental investigation and finite element modelling of residual stress control in disc springs made of metastable austenitic stainless steel (MASS) using incremental sheet forming (ISF).
SHEMET 2019, 18th International Conference on Sheet Metal, Leuven, Belgium, 15.-18. Apr. (2019).

2) Hajavifard, R. (V.); Maqbool, F.; Bambach, M.; Walther, F.:
Process-integrated residual stress induction on disc springs by means of incremental sheet metal forming technique.
MSE 2018, Materials Science and Engineering, Darmstadt, 26.-28. Sept. (2018).

1) Awd, M. (V.); Siddique, S.; Hajavifard, R.; Walther, F.:
Comparative study of defect-based and plastic damage-based approaches for fatigue lifetime calculation of selective laser-melted AlSi12.
FFW 2018, 7th International Conference on Fracture Fatigue and Wear, Ghent, Belgium, 09.-10. July (2018).

 

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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