Measurement of damage growth in ultrasonic spot welded joint

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Ultrasonic spot welding is a joining technique for thermoplastic composites with great potential regarding processing speed and cost. To investigate the damage tolerance and possible inherent damage arresting behavior of multi-spot welded joints, a technique is necessary to measure damage growth in the joints under cyclic loading. Visual inspection is not possible because the damage is not located on the outside surface and conventional techniques such as C-scan are not practical during a fatigue test because the specimen would have to be removed from the setup. This paper details a methodology for quantifying damage growth rates in singlespot welded joints using surface strain measurements made by Digital Image Correlation. This represents the first step towards developing a methodology for quantifying damage progression behavior in complex multi-spot welded joints.
Original languageEnglish
Title of host publicationProceedings of the 20th European Conference on Composite Materials: Composites Meet Sustainability
Subtitle of host publicationVol 3 – Characterization
EditorsAnastasios P. Vassilopoulos , Véronique Michaud
Place of PublicationLausanne
PublisherEPFL Lausanne, Composite Construction Laboratory
Number of pages9
ISBN (Electronic)978-2-9701614-0-0
Publication statusPublished - 2022
Event20th European Conference on Composite Materials: Composites Meet Sustainability - Lausanne, Switzerland
Duration: 26 Jun 202230 Jun 2022
Conference number: 20


Conference20th European Conference on Composite Materials
Abbreviated titleECCM20


  • Ultrasonic spot welding
  • thermoplastic composites
  • Digital image correlation
  • Fatigue
  • damage growth

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