Morphology of ply drops in thermoplastic composite materials manufactured using laser-assisted tape placement

Daniël Peeters, Michael Deane, Ronan O'Higgins, Paul M. Weaver

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Mechanical properties of composite laminates can be tuned by either tailoring ply orientations or by using ply drops to change thickness profiles. The latter cause resin-rich pockets to form in thermoset composites that are autoclave cured after lay-down. This paper focuses on the morphology of ply drop regions with carbon fibre thermoplastic composites manufactured using in-situ consolidation with laser-assisted tape placement. Our work shows that when laying a 0° ply (parallel to the ply drop) over a ply drop then the ply readily conforms to the shape of the ply drop, eliminating voids. However, when a 90° ply covers a ply drop, the processing direction affects behaviour. When the ply ascends a ply drop, a void is created. On the other hand, when the ply descends a ply drop, the substrate changes its shape due to combined laser heat and roller pressure, leading to significantly smaller voids.

Original languageEnglish
Article number112638
Number of pages18
JournalComposite Structures
Volume251
DOIs
Publication statusPublished - 1 Nov 2020

Keywords

  • Automated fiber placement
  • Defects
  • Tape placement
  • thermoplastic resin

Fingerprint Dive into the research topics of 'Morphology of ply drops in thermoplastic composite materials manufactured using laser-assisted tape placement'. Together they form a unique fingerprint.

  • Cite this