Characterising gross plastic deformation in design by analysis

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An investigation of three simple structures is conducted to identify and characterise the condition of gross plastic deformation in pressure vessel design by analysis. Limit analysis and bilinear hardening plastic analysis is performed for three simple example problems. It is found that previously proposed plastic criteria do not fully represent the effect of the hardening material model on the development of the plastic failure mechanism. A new criterion of plastic collapse based on the curvature of the load–plastic work history is therefore proposed. This is referred to as the Plastic Work Curvature or PWC criterion. It is shown that salient points of curvature correspond to critical stages in the physical evolution of the gross plastic deformation mechanism. The PWC criterion accounts for the effect of the bilinear hardening model on the development of the plastic mechanism and gives an enhanced plastic load when compared to the limit load.

Original languageEnglish
Pages (from-to)777-786
Number of pages9
JournalInternational Journal of Pressure Vessels and Piping
Issue number10
Publication statusPublished - Oct 2005


  • plastic
  • plastic deformation
  • design
  • analysis
  • plastic work curvature

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