2021

• Popp J., Kleffel T., Römisch D., Papke T., Merklein M., Drummer D.:
  Fiber Orientation Mechanism of Continuous Fiber Reinforced Thermoplastics Hybrid Parts Joined with Metallic Pins
  In: Applied Composite Materials (2021)
  ISSN: 0929-189X
  DOI: 10.1007/s10443-021-09892-0

2020

• Hertle S., Kleffel T., Wörz A., Drummer D.:
  Production of polymer-metal hybrids using extrusion-based additive manufacturing and electrochemically treated aluminum
  In: Additive Manufacturing 33 (2020), Art.Nr.: 101135
  ISSN: 2214-7810
  DOI: 10.1016/j.addma.2020.101135
• Mattner T., Popp J., Kleffel T., Gröschel C., Drummer D.:
  High Speed Forming of Continuous Fiber Reinforced Thermoplastics
  In: Applied Composite Materials (2020)
  ISSN: 0929-189X
  DOI: 10.1007/s10443-020-09794-7

2019

• Deringer T., Kleffel T., Drummer D.:
  Integrative manufacturing of thermoset injection molding components with continous fiber-reinforcement
  In: Zeitschrift Kunststofftechnik 15 (2019), S. 169-187
  ISSN: 1864-2217
  DOI: 10.3139/O999.03022019
• Gierl B., Hertle S., Kleffel T., Drummer D.:
  Micrometer accurate measurement of tooth wear
  In: Kunststoffe International 109 (2019), S. 107-109
  ISSN: 1862-4243
• Kleffel T., Frey P., Merklein M., Drummer D.:
  Analysis of the formation of gap-based leakages in polymer-metal electronic systems with labyrinth seals
  In: Journal of Polymer Engineering (2019)
  ISSN: 0334-6447
  DOI: 10.1515/polyeng-2019-0098
• Kraus M., Frey P., Kleffel T., Drummer D., Merklein M.:
  Mechanical joining without auxiliary element by cold formed pins for multi-material-systems
  22nd International ESAFORM Conference on Material Forming (ESAFORM 2019) (Vitoria-Gasteiz, 8. Mai 2019 - 8. Mai 2019)
• Ott C., Wolf M., Kleffel T., Drummer D.:
  Haftungsinkompatible Kunststoff-Kunststoff-Verbunde mit gesteigerter Mediendichtheit mittels aufgesinterter Mikrostrukturen
  In: Zeitschrift Kunststofftechnik 15 (2019), S. 314-334
  ISSN: 1864-2217
• Schubert D., Hertle S., Kleffel T., Drummer D.:
  Development of a simulation method for the prediction of transmission errors of injection molded spur gears
  22nd International ESAFORM Conference on Material Forming, ESAFORM 2019 (Vitoria-Gasteiz, 8. Mai 2019 - 10. Mai 2019)
  In: Pedro Arrazola, Eneko Saenz de Argandona, Nagore Otegi, Joseba Mendiguren, Mikel Saez de Buruaga, Aitor Madariaga, Lander Galdos (Hrsg.): AIP Conference Proceedings 2019
  DOI: 10.1063/1.5112663
• Ullmer A., Kleffel T., Zhai Z., Mattner T., Drummer D.:
  A Practical Approach for Validation of Aptitude of Sized Carbon Fibers for the In-Mould -Impregnation Process
  In: American Journal of Mechanical and Materials Engineering 3 (2019), S. 11-19
  ISSN: 2639-9628
  DOI: 10.11648/j.ajmme.20190301.12

2018

• Kleffel T., Drummer D.:
  Electrochemical treatment of metal inserts for subsequent assembly injection molding of tight electronic systems
  In: Journal of Polymer Engineering (2018)
  ISSN: 0334-6447
  DOI: 10.1515/polyeng-2017-0432
• Kleffel T., Drummer D.:
  One-step Electrochemical Treatment of Metal Inserts for Tight Polymer-Metal Hybrid Applications
  SPE Antec 2018 (Orlando)
• Wittmann LM., Kleffel T., Mattner T., Drummer D.:
  Influence of Stitching Parameters on the Joint Strength of Welded-Stitched Composites
  In: International Polymer Processing 33 (2018), S. 706-713
  ISSN: 0930-777X
  DOI: 10.3139/217.3518

2017

• Kleffel T., Drummer D.:
  Investigating the suitability of roughness parameters to assess the bond strength of polymer-metal hybrid structures with mechanical adhesion
  In: Composites Part B-Engineering 117 (2017), S. 20-25
  ISSN: 1359-8368
  DOI: 10.1016/j.compositesb.2017.02.042
• Kleffel T., Drummer D., Kuhmann K.:
  Adhesion promoter for unequal pairs
  In: Kunststoffe International 107 (2017), S. 80-83
  ISSN: 1862-4243
• Kleffel T., Drummer D., Kuhmann K.:
  Vermittler für ungleiche Paare
  In: Kunststoffe International (2017), S. 199-203
  ISSN: 1862-4243
• Wolf M., Kleffel T., Leisen C., Drummer D.:
  Joining of Incompatible Polymer Combinations by Form Fit Using the Vibration Welding Process
  In: International Journal of Polymer Science 2017 (2017), S. 8
  ISSN: 1687-9422
  DOI: 10.1155/2017/6809469

2015

• Drummer D., Vittinghoff J., Kleffel T., Kuhmann K., Farges O., Gruhn M., Risthaus M., Baranowski T., Koch R., Nießen B., Wehmeyer I., Küsters K., Lutter F., Malek T., Theiler S., Braun S., Jobi A., Szabo SA., Schwarzer R., Mang S., Welsch K., Brandt P., van Haag J., Hopmann C., Schild J.:
  Handbuch Kunststoff-Metall-Hybridtechnik
  Erlangen: Lehrstuhl für Kunststofftechnik, 2015
  ISBN: 978-3-931864-66-8