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OMAE2012-83527 Development of BS 7910 Failure Assessment Diagram for Strain Based Design with Application to Pipelines
Simon Smith
TWI Ltd
Cambridge, Cambridgeshire,
United Kingdom
ABSTRACT
Engineering Critical Assessment (ECA) uses J estimation
schemes to derive the crack tip loading of complex structures to
determine their tolerance to crack-like flaws. The methods
currently being used were derived in the 1980s for structures
with primary stresses below the material yield strength. These
are now being extensively used for loads beyond this level for
what has been called Strain Based Design (SBD). Some papers
have shown the standards BS7910:2005 and R6 Revision 4 can
be unconservative when used for SBD. A possible reason has
been identified and a suitable modification proposed. The
proposed modification is briefly reviewed in the present paper
together with a comparison of the method with suitable crack
driving force data.
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