Experimental evaluation of mode I fracture toughness of dissimilar-material joints with thermal residual stresses

Kazuki Harada, Kristine Munk Jespersen, Momoka Shima, Atsushi Hosoi*, Hiroyuki Kawada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The mode I interlaminar fracture toughness of dissimilar-material joints with thermal residual stresses is experimentally evaluated. The double cantilever beam (DCB) test is commonly used to assess the interlaminar fracture toughness of composites but is inadequate when dissimilar materials are joined owing to the mixed mode, which arises from differences in the bending stiffness and the thermal residual stresses formed during manufacturing because of differences in the linear expansion coefficient of the adherends. To address these difficulties, a new test, named the constant-load DCB test, was developed to evaluate the mode I interlaminar fracture toughness. In this study, a testing machine, based on the theoretical method previously established to derive the mode I interlaminar fracture toughness of dissimilar-material joints, is manufactured, and the fracture toughness is experimentally determined. As a result, good agreement between the theoretical value and experimental results is obtained, and the mode mixity ratio is significantly decreased compared with that of the general DCB test.

Original languageEnglish
Article number109459
JournalComposites Science and Technology
Volume224
DOIs
Publication statusPublished - 2022 Jun 16

Keywords

  • A. Carbon fibers
  • B. Fracture toughness
  • C. Residual stress
  • Mode I

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)

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