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The detailed structure of delamination fracture surfaces in graphite/epoxy laminates

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Abstract

Delamination fracture surfaces of angle-ply graphite/epoxy specimens failed in tension were studied in the SEM. The fracture surfaces contain resin-rich and resin-poor areas, with the former showing imprints from fibres while the latter show debonded fibres. A delamination crack propagates in the outer parts of the plies adjacent to the resin-rich interlaminar region and alternates from one ply to the adjacent ply and back as it propagates. The serrations formed in between fibres in the outermost parts of plies are tilted. The sense of the tilt is in agreement with the direction of the major tensile principal stress. The delamination is suggested to proceed in steps including debonding of fibres, crack opening by the major principal tensile stress and linking together of these fractures.

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Author notes

  1. R. Seldén

    Present address: Swedish plastics and rubber institute, Bultgatan 5, S-852 47, Sundsvall, Sweden

Authors and Affiliations

  1. Division of Engineering Materials, Department of Mechanical Engineering, Linköping Institute of Technology, S-581 83, Linköping, Sweden

    T. Johannesson, P. Sjöblom & R. Seldén

Authors
  1. T. Johannesson
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  2. P. Sjöblom
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  3. R. Seldén
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Johannesson, T., Sjöblom, P. & Seldén, R. The detailed structure of delamination fracture surfaces in graphite/epoxy laminates. J Mater Sci 19, 1171–1177 (1984). https://doi.org/10.1007/BF01120026

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  • DOI: https://doi.org/10.1007/BF01120026

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