The effect of nanospike structures on direct bonding strength properties between aluminum and carbon fiber reinforced thermoplastics

Hikaru Abe, Joon Cheol Chung, Takaaki Mori, Atsushi Hosoi, Kristine Munk Jespersen, Hiroyuki Kawada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

With recent design developments in the automotive industry, it has become necessary to join dissimilar materials such as aluminum and carbon fiber reinforced thermoplastics (CFRTPs). In this study, a nanospike structure is fabricated on the surfaces of aluminum plates and directly bonded to CFRTP laminates. The effect of the nanospike structure on the adhesion strength is evaluated by single-lap joint tests. It is found that the nanospike structure improves the adhesion strength. Furthermore, combining the nanospike structure with a silane coupling treatment results in failure in the aluminum part of the single-lap specimens with an overlap length of 12.5 mm, rather than in the joined region. The average adhesion strength of the single lap joint specimens with an overlap length of 5.0 mm is found to be 24.9 MPa. Scanning electron microscopy observations of the fracture surfaces of the joined region only showed cohesive failure. On the fracture surface of the CFRTP laminate, the matrix exhibits a hairy structure due to the presence of the nanospike structure in some regions and in other regions carbon fibers are exposed due to adherend failure. Thus, in addition to an improved joint strength, the results suggest that the nanostructure will also improve the fracture toughness by causing ductile failure of the matrix.

Original languageEnglish
Pages (from-to)26-32
Number of pages7
JournalComposites Part B: Engineering
Volume172
DOIs
Publication statusPublished - 2019 Sep 1

Keywords

  • A. Hybrid
  • A. Nano-structures
  • A. polymer-matrix composites (PMCs)
  • E. joints/joining
  • Silane coupling treatment

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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