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Shear induced toughening in bonded joints: experiments and analysis

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Abstract

Bonded joint specimens were fabricated from composite adherends and either an epoxy or a urethane adhesive. In mixed-mode fracture experiments, the epoxy bonded specimens generally failed by subinterfacial fracture in the composite, while specimens bonded with urethane failed very close to the adhesive/substrate interface. For the epoxy bonded specimens, fracture toughness did not change significantly with mode-mix, but for urethane bonded joints, fracture toughness increased with increasing shear load. Finite element analysis, which modeled specimens bonded with the two adhesives, showed similar trends. The different toughening behaviors for the two bonded joints can be attributed to dissipation of energy through inelastic deformation, which was insignificant in the epoxy-bonded joints but substantial when the urethane was used as the bonding agent.

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Author notes

  1. J.G. Swadener

    Present address: Oak Ridge National Laboratory, Metals and Ceramics Div., P.O. Box 2008 MS-6116, Oak Ridge, TN, 37831-6116, USA

  2. Y-M. Liang

    Present address: ADT Engineering, Flint, MI, USA

Authors and Affiliations

  1. Research Center for the Mechanics of Solids, Structure & Materials, Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, Austin, TX , 78712, USA

    K.M. Liechti

Authors
  1. J.G. Swadener
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  2. K.M. Liechti
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  3. Y-M. Liang
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Swadener, J., Liechti, K. & Liang, YM. Shear induced toughening in bonded joints: experiments and analysis. International Journal of Fracture 114, 113–132 (2002). https://doi.org/10.1023/A:1015013618976

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