Materials Properties for Engineering Critical Assessment - Background To Advi...

asnt2012

Materials Properties for Engineering Critical Assessment - Background To Advice Given in BS 7910 2013

Isabel Hadley* and Henryk Pisarski**
* Technology Fellow, TWI Ltd, Great Abington, Cambridge, UK, CB21 6AL (Isabel.hadley@twi.co.uk)
** Independent consultant

ABSTRACT
The UK procedure for fracture mechanics-based assessment of flaws (BS 7910) was extensively
updated in late 2013. This paper outlines how and why the clauses relating to materials properties (in
particular those relating to brittle and ductile fracture) have been expanded, and explains the origin
and extent of validation of the information. Some worked examples of the treatment of fracture
toughness are given, based on results from weld metal tests.

INTRODUCTION
BS 7910 ‘Guide to methods for assessing the acceptability of flaws in metallic structures’ (1) is a
procedure for the assessment of flaws in metallic structures, covering failure by fracture, fatigue,
corrosion and creep. It is used to make decisions on serviceability of safety-critical plant and
structures, but also in failure investigation, life extension and design. It has been in continuous use
since 1999, when it superseded the earlier UK flaw assessment procedure PD 6493. The most recent
edition of the procedure was published in 2013 and amended in 2015. It evolved (see Figure 1) from a
mixture of sources, including previous editions of BS 7910/PD 6493, the UK nuclear safety
assessment procedure R6 (2) and the European SINTAP and FITNET documents (note that the two
European procedures (3) are no longer maintained).

One of the features of BS 7910:2013 is a significant expansion of the clauses on materials properties,
particularly those relating to brittle and ductile fracture of ferritic steels. Whilst several publications
have already addressed the background to various aspects of the procedure ((4)-(6)), the information
currently in the public domain relating to materials properties is rather limited. The purpose of this
paper is therefore to document the origin and extent of validation of the current clauses relating to
materials properties used for fracture assessment, and to identify gaps where future work may be
required.

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Materials Properties for Engineering Critical Assessment - Background To Advice Given in BS 7910 2013

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Materials Properties for Engineering Critical Assessment - Background To Advi.

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