Abstract
Direct and indirect methods of quantifying structural damage or residual mechanical properties have been investigated and compared for virgin Nimonic 115 and ex-service material from gas turbine blading. Whilst the indirect technique of X-ray diffraction line profile analysis exhibits a significant increase in line width with increasing creep strain, the current level of experimental scatter would need to be reduced for it to be a useful life assessment tool. The direct technique of temperature accelerated stress rupture (isostress) testing is shown to produce data which can be extrapolated to service conditions with confidence and which can be used in an assessment procedure. Stress accelerated rupture testing is demonstrated to give an unduly conservative indication of residual rupture properties at service conditions.
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