Sequential ultrasonic spot welding of thermoplastic composites: An experimental study on the welding process and the mechanical behaviour of (multi-)spot welded joints

Tian Zhao

Research output: ThesisDissertation (TU Delft)

29 Downloads (Pure)

Abstract

The popularity of thermoplastic composites (TPCs) has been growing steadily in the last decades in the aircraft industry. This is not only because of their excellent material properties, but also owing to their fast and cost-effective manufacturing process. Fusion bonding, or welding, is a typical joining method for TPCs due to the intrinsic properties of thermoplastic polymers. Among different welding technologies, ultrasonic welding has been regarded as one of the most promising techniques for the assembly of TPC components. Ultrasonic welding is by nature a spot welding technique. As it is known that a series of problems result from using mechanical fasteners for joining composite structures, e.g. breaking fibres during drilling and extensive labour work, ultrasonic spot welding can be considered as a promising alternative from the perspective of fast manufacturing cycle. However, fundamental understanding is still lacking to achieve application of ultrasonic spot welding in composite structures to be achieved:
Original languageEnglish
Awarding Institution
  • Delft University of Technology
Supervisors/Advisors
  • Benedictus, R., Supervisor
  • Fernandez Villegas, I., Advisor
Award date14 May 2018
Electronic ISBNs978-94-6295-916-3
DOIs
Publication statusPublished - 2018

Keywords

  • Thermoplastic composites
  • Ultrasonic spot welding
  • Mechanical behaviour
  • Fractographic analysis

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