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Analysis of stitched laminated ENF specimens for interlaminar mode II fracture toughness

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Abstract

Two simple micromechanics based models are proposed to predict the effect of through-thickness reinforcement (stitching) on the improvement of delamination crack growth resistance in end-notched flexure (ENF) specimens. In the first model, it is assumed that stitches stretch elastically and then rupture when the load carried approaches the failure load. In the second model, it is assumed that stitches are discontinuous and that the stitch thread-matrix interface is completely frictional. Approximate closed form solutions for energy release rates are obtained, and the effects of stitch density, matrix-stitch thread interfacial shear stress, stitch thread diameter, volume fraction of stitches, critical energy release rate and Young's modulus are then examined. A simple design study for sizing the ENF specimen to minimise geometric nonlinear response is presented. The influences of interlaminar shear deformation and friction between the crack surfaces on the strain energy release rate are examined.

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Author notes

  1. Yiu-Wing Mai

    Present address: On leave at the Department of Mechanical Engineering, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong

Authors and Affiliations

  1. Cooperative Research Centre for Aerospace Structures, c/o Hawker De Havilland, P.O. Box 30, 2200, Bankstown, NSW, Australia

    Lalit K. Jain

  2. Centre for Advanced Materials Technology, Department of Mechanical and Mechatronic Engineering, University of Sydney, 2006, Sydney, NSW, Australia

    Yiu-Wing Mai

Authors
  1. Lalit K. Jain
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  2. Yiu-Wing Mai
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Jain, L.K., Mai, YW. Analysis of stitched laminated ENF specimens for interlaminar mode II fracture toughness. Int J Fract 68, 219–244 (1994). https://doi.org/10.1007/BF00013069

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  • DOI: https://doi.org/10.1007/BF00013069

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