Rupture modelling and extrapolation of a sparse dataset for Inconel 740H

Highlights: Highlights: of draft paper Rupture modelling and extrapolation for a sparse dataset for Inconel 740H.• Demonstrates extension of the P-NID procedure for rupture modelling to a sparse dataset. • Presents alternative models for Inconel 740H and metrics of their accuracy. • Identifies most reliable model for extrapolation to over 100,000 h. • Demonstrates somewhat better long-term properties for Inconel 740H than published previously. Application of the P-NID procedure for modelling and extrapolation is demonstrated for a sparse set of rupture test results for Inconel 740H. Models based on data restricted to 8000 h are extrapolated and compared to longer-term data at up to 70,000 h. Further extrapolations are presented for lifetimes in the range 100,000 h to 200,000 h, and the reliability of these extrapolations is discussed. Comparisons are made to published extrapolations based on conventional models.