open access publication

Article, 2022

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

Composites Science and Technology, ISSN 1879-1050, 0266-3538, Volume 224, Page 109459, 10.1016/j.compscitech.2022.109459

Contributors

Harada, Kazuki [1] Jespersen, Kristine Munk 0000-0002-6796-6200 [2] Shima, Momoka 0000-0001-9415-1456 [1] Hosoi, Atsushi 0000-0002-5245-0965 (Corresponding author) [1] [3] Kawada, Hiroyuki [1] [3]

Affiliations

  1. [1] Waseda University
    2. [NORA names: Japan; Asia, East; OECD];
  2. [2] Technical University of Denmark
    3. [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD];
  3. [3] Kagami Memorial Research Institute for Materials Science and Technology, 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
    4. [NORA names: Japan; Asia, East; OECD]

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.

Keywords

DCB tests, adherends, beam, bending stiffness, cantilever beam, coefficient, composition, differences, difficulties, dissimilar material joints, double cantilever beam, double cantilever beam test, expansion coefficient, experimental evaluation, experimental results, fracture, fracture toughness, fracture toughness of composites, interlaminar fracture toughness, interlaminar fracture toughness of composites, joints, linear expansion coefficient, machine, manufacturing, materials, method, mixity ratio, mode, mode I fracture toughness, mode I interlaminar fracture toughness, mode mixity ratio, ratio, residual stress, results, stiffness, stress, study, test, testing machine, theoretical methods, theoretical values, thermal residual stresses, toughness, toughness of composites, values

Funders

  • Japan Society for the Promotion of Science

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