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Fracture behaviour of uPVC thin tubes at high loading rates

Part 2 Validity of fracture toughness tests and the effects of rate

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Abstract

Impact tests and fracture toughness tests were carried out using thin cylindrical specimens of unplasticized poly (vinyl chloride). The specimens, both pre-notched and unnotched, were internally pressurized to fracture at high loading rates, using a conventional shock tube. Over the wide range of the applied loading rates, failure of the pre-notched specimens occurred in a completely brittle mode, while in the case of unnotched specimens, a transition from “semi-brittle” to brittle fracture occurred over the same range of loading rate. Adopting standard linear elastic fracture mechanics (LEFM) analysis, a validity criterion is suggested based on the variation of the extent of crack tip plasticity with the loading rate, as calculated by Dugdale and Irwin models. It is suggested that the decrease in the plastic zone size with increasing rate, affects the size requirement for a valid (plane strain) fracture toughness value.

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Authors and Affiliations

  1. Mechanical Engineering Department, Imperial College, Exhibition Road, SW7, London, UK

    M. B. Jamarani

  2. Department of Materials, Queen Mary College, Mile End Road, E1 4NS, London, UK

    P. E. Reed

  3. Department of Mechanical Engineering, Queen Mary College, Mile End Road, E1 4NS, London, UK

    W. R. Davies

Authors
  1. M. B. Jamarani
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  2. P. E. Reed
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  3. W. R. Davies
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Jamarani, M.B., Reed, P.E. & Davies, W.R. Fracture behaviour of uPVC thin tubes at high loading rates. J Mater Sci 24, 2917–2922 (1989). https://doi.org/10.1007/BF02385647

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  • DOI: https://doi.org/10.1007/BF02385647

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