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Plastic Collapse in BS 7910:2005 and R6/Fitnet Procedures


Differences in the Assessment of Plastic Collapse in BS 7910: 2005 and R6/Fitnet FFS Procedures

Şefika Elvin Eren, Kamran Nikbin (Imperial College London) and Isabel Hadley, TWI Ltd

Proceedings of the ASME 2011 Pressure Vessels and Piping Division Conference
PVP 2011
July 17-21, 2011, Baltimore, Maryland, USA


At present within the fracture assessment routes of different codes and standards, two different options for the assessment of plastic collapse, Lr, are available, namely reference stress and limit load approaches.

Recent comparative studies have shown significant differences in the assessment of plastic collapse depending on whether the reference stress solutions in BS 7910:2005 or the limit load solutions in R6/FITNET are used for the calculation of Lr.

In this paper, differences with respect to the choice of solutions and boundary conditions will be illustrated and observations regarding the route that the Codes should take with respect to a unified assessment will be discussed.

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