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Shear strength of polymers under hydrostatic pressure: Surface coatings prevent premature fracture

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Abstract

The effect of surface rubber coatings on the stress-strain behaviour in shear of polymethylmethacrylate (PMMA), polyethylene terephthalate (PET) and polyethylene has been examined. Uncoated PMMA fractures without yielding at high pressure, while it is ductile at lower pressures. The high pressure fracture is thought to be due to pressure fluid penetrating into surface cracks allowing them to grow in spite of the applied hydrostatic pressure. Coating in rubber prevents such penetration and PMMA remains ductile up to 7 kbar. PET and polyethylene are normally ductile at all pressures, and coating in rubber has no effect on their behaviour. Failure here is due to internal flaws.

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Authors and Affiliations

  1. Physics Department, University of Leeds, Leeds, UK

    J. S. Harris & I. M. Ward

  2. Department of Mechanical Engineering, University of Bristol, Bristol

    J. S. C. Parry

Authors
  1. J. S. Harris
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  2. I. M. Ward
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  3. J. S. C. Parry
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Harris, J.S., Ward, I.M. & Parry, J.S.C. Shear strength of polymers under hydrostatic pressure: Surface coatings prevent premature fracture. J Mater Sci 6, 110–114 (1971). https://doi.org/10.1007/BF00550339

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  • DOI: https://doi.org/10.1007/BF00550339

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