Abstract
Details are given of a new technique for the mapping of creep damage zone development ahead of stress concentrations in laboratory testpieces and structures which have been loaded for long times at high temperatures. The technique has been developed as part of a project concerned with the characterisation of creep damage generated under multi-axial loading conditions in advanced martensitic 9%Cr steel weldments, but is applicable to other engineering materials. The approach may be effectively used to demonstrate how the creep damage tolerances of individual microstructural constituents determine the fracture path in welded structures operating at high temperatures. Damage zone sizes determined by this technique compare favourably with the results of analytical predictions when a consistent boundary criterion is adopted.
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