Dr.-Ing. Balaji Ragupathi

Work at ZHAW

Position

Research Associate

Experience

• Research Associate
  ZHAW Zurich University of Applied Sciences | IMPE
  10 / 2025 - today
• Research Associate / PhD Candidate
  University of Freiburg | INATECH EFM
  03 / 2021 - 09 / 2025
• Research Associate
  Fraunhofer Institute for Mechanics of Materials IWM, Freiburg i. Br.
  07 / 2019 - 02 / 2021

Education and Continuing education

Education

• Dr.-Ing. / Power Ultrasonics
  University of Freiburg | INATECH EFM
  03 / 2021 - 07 / 2025
• M.Sc. / Sustainable Systems Engineering SSE
  University of Freiburg
  10 / 2016 - 07 / 2019
• B.E. Mechanical Engineering / Material Science
  Anna University Chennai
  05 / 2012 - 04 / 2016

Network

ORCID digital identifier

ORCID ID: 0000-0003-4275-7813

Social media

• LinkedIn
• Research Gate

Publications

Articles in scientific journal, peer-reviewed

• Roth, M., Aoun, E. A., Focke, O., Beermann, D., Ragupathi, B., Freihart, K., May, D., & Balle, F. (2026). Ultrasonic welding and separation of additively manufactured short‑carbon-fiber-reinforced PEKK. Materials Letters, 425(141602). https://doi.org/10.1016/j.matlet.2026.141602
• Ragupathi, B., Walter, M., Fiedler, B., & Balle, F. (2025). Feasibility study on ultrasonic-assisted processing techniques for the value-retention of hybrid thermoplastic–thermoset composites. Composites Part A: Applied Science and Manufacturing, 199(109249). https://doi.org/10.1016/j.compositesa.2025.109249
• Ragupathi, B., Strahringer, S., Rienks, M., Jakkula, P., Hohe, J., & Balle, F. (2025). Fracture toughness characterization of carbon fiber‐reinforced thermoplastic composites under ultrasonic frequency. Polymer Composites, 46(S1), S575–S589. https://doi.org/10.1002/pc.29801
• Ragupathi, B., Burger, L., & Balle, F. (2025). Post-joining thermal characteristics and repair integrity of carbon fiber-reinforced thermoplastic composites during ultrasonic reconsolidation at 20 kHz. Composites Part C: Open Access, 16(100565). https://doi.org/10.1016/j.jcomc.2025.100565
• Ragupathi, B., Rotzinger, L., Prescher, M., Rienks, M., Kirste, L., & Balle, F. (2025). Ultrasonic reconsolidation of separated CF-PEEK composite layers at 20 kHz : an experimental study on parameter optimization and ex-situ characterization. Composite Structures, 353(118722). https://doi.org/10.1016/j.compstruct.2024.118722
• Ragupathi, B., Jakkula, P., Rienks, M., & Balle, F. (2024). Online monitoring of pre-crack initiation in carbon fiber-reinforced thermoplastic composites by an ultrasonic cutting tool using high-speed optical imaging and infrared thermography. Ultrasonics, 143(107411). https://doi.org/10.1016/j.ultras.2024.107411
• Ragupathi, B., & Balle, F. (2024). Characterization of glass-fiber reinforced thermoplastic composite after ultrasonic reconsolidation. European Journal of Materials, 4(1). https://doi.org/10.1080/26889277.2024.2313316
• Ragupathi, B., Bacher, M. F., & Balle, F. (2023). Separation and reconsolidation of thermoplastic glass fiber composites by power ultrasonics. Resources, Conservation and Recycling, 198(107122). https://doi.org/10.1016/j.resconrec.2023.107122
• Ragupathi, B., Bacher, M. F., & Balle, F. (2023). First efforts on recovery of thermoplastic composites at low temperatures by power ultrasonics. Cleaner Materials, 8(100186). https://doi.org/10.1016/j.clema.2023.100186

Written conference contributions, peer-reviewed

Ragupathi, B., Weidenmann, K. A., & Balle, F. (2025, August). Ultrasonic reconsolidation at 20 KHz : a potential repair approach for aerospace composites. 24th International Conference on Composite Materials (ICCM-24) , Baltimore, USA, 4-8 August 2025. https://doi.org/10.5281/zenodo.18598616

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