Characterization of resistance-welded thermoplastic composite double-lap joints under static and fatigue loading

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1177/0892705713490714
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Name affiliation
  1. National Research Council of Canada. Aerospace
FormatText, Article
Journal titleJournal of Thermoplastic Composite Materials
ISSN0892-7057
Volume28
Issue6
Pages762–776
SubjectCarbon; Carbon fibers; Composite materials; Dynamic light scattering; Fatigue of materials; Joints (structural components); Plastics; Reinforced plastics; Resistance welding; Scanning electron microscopy; Stainless steel; Steel fibers; Stresses; Thermoplastics; Double lap joint; Fatigue loadings; Fusion bonding; Mechanical performance; Single lap shears; Stainless steel mesh; Thermoplastic composite; Welding
Abstract
An experimental investigation of resistance welding of thermoplastic composite double lap shear (DLS) joints is presented. DLS specimens consisting of unidirectional carbon fibre/polyetheretherketone (CF/PEEK), carbon fibre/polyetherketoneketone (CF/PEKK), carbon fibre/polyetherimide (CF/PEI) and 8-harness satin weave fabric glass fibre/polyetherimide (GF/PEI) composites were resistance welded using a stainless steel mesh heating element. The welded specimens were tested under static and fatigue loadings, and the quality of the welds was examined using optical and scanning electron microscopy. Weld strengths of 53, 49, 45 and 34 MPa were obtained for CF/PEEK, CF/PEKK, CF/PEI and GF/PEI DLS joints, respectively. Indefinite fatigue lives were obtained between 20 and 30% of the ultimate static failure loads of the joints. Performances of the resistance-welded DLS and single lap shear (SLS) joints were compared. It was shown that the effect of joint geometry, that is, DLS versus SLS, on the mechanical performance of the resistance-welded joints is minimal, indicating a good resistance of welded joints to peel stresses.
Publication date
PublisherSAGE Publications
LanguageEnglish
Peer reviewedYes
NPARC number21275477
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