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Development of a simple mixed-mode fracture test and the resulting fracture energy envelope for an adhesive bond

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Abstract

Characterizing the fracture energy of bonded adhesive joints over a range of mode mixities often requires special fixtures or a variety of test configurations. By pairing a tapered and a constant thickness adherend, a hybrid double cantilever beam (DCB) specimen is proposed. This asymmetric tapered DCB configuration can be used to determine the fracture energy as a function of mode mixity. As the debond propagates, the relative stiffness of the adherends varies in a systematic manner, resulting in a range of mode mixities from 0° to approximately 20°. Strain energy release rates were obtained using corrected beam theory and a finite element fracture analysis. Single-leg bending tests were used to determine the fracture energy at mode mixity up to 56°. Constant thickness and tapered DCB tests were used to determine the mode I fracture energy. The resulting fracture envelope was constructed in order to show the dependence of the fracture energy on mode mixity for a two part acrylic adhesive.

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Author notes

  1. Soojae Park

    Present address: IBM T.J. Watson Research Center, Yorktown Heights, NY, 10598, USA

Authors and Affiliations

  1. Department of Engineering Science and Mechanics, Virginia Tech, Blacksburg, VA, 24061, USA

    Soojae Park & David A. Dillard

Authors
  1. Soojae Park
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  2. David A. Dillard
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Correspondence to David A. Dillard.

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Park, S., Dillard, D.A. Development of a simple mixed-mode fracture test and the resulting fracture energy envelope for an adhesive bond. Int J Fract 148, 261–271 (2007). https://doi.org/10.1007/s10704-008-9200-z

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  • DOI: https://doi.org/10.1007/s10704-008-9200-z

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