New brittle fracture model for the European pressure vessel standard

  • Sandström R
  • Langenberg P
  • Sieurin H
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Abstract

A model for design against brittle failure based on recent fracture mechanics findings is proposed. The procedure is an update of that in the recent European pressure vessel standard EN 13445. The thickness dependence of the maximum permissible crack has been analysed with the help of research on non-destructive testing. Cracks with a quarter thickness depth are assumed to be readily detectable for larger gauges. For thinner gauges the cracks have to cover a larger fraction of the thickness to be safely observed. The model is verified by comparison to fracture mechanics test data for high strength steels. Results from individual wide plate tests are successfully reproduced by the model. Furthermore, T100values (the temperature where KJC=MPa m1/2) for test series are conservatively predicted by the model. The model adequately describes the influence of thickness and heat treatment on the T100values. © 2004 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Brittle failure
  • Crack size
  • Design
  • Pressure vessel
  • Standard
  • Steel

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