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Introducing CrackWISE® Version 5

A new version of BS7910, the UK flaw assessment procedure [1], has been published. This is a major revision with respect to the current edition (published in 2005 and amended in 2007), particularly in the clauses and annexes relating to fracture [2], and supersedes the 2005 edition. Amongst the new content are methods for assessing the effects of overmatching and undermatching welds, for assessing crack tip constraint and for incorporating the effects of residual stress.

Even a straightforward analysis to BS7910 typically requires the use of multiple parametric equations, to calculate (as a minimum) stress intensity factor (SIF) and reference stress (σref). Whilst simple analyses of known flaws can in principle be carried out using standard software tools such as spreadsheets, there is often a need to carry out complex and iterative calculations. This is particularly pertinent to propagating flaws (for example, assessment of fatigue crack growth or ductile tearing) and to the calculation of limiting conditions (for example, the maximum tolerable flaw size in a structure under given conditions). Specialist software is invaluable in performing, reporting, editing and archiving such complex calculations, and it is for such situations that CrackWISE® was developed.

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