The classic approach to the prediction of stress-rupture involves using time-temperature parameters. Since 1952 with the introduction of the Larson-Miller parameter, many different time-temperature parameters have been introduced. There have been several attempts to generalize the many time-temperature models into a single “metamodel”. A common approach is to use a pre-defined stress-parameter function that is force fit to the submodels leading to biased predictions. In this study, a novel metamodeling approach is applied to derive a single metamodel that incorporates twelve time-temperature parameters (eight existing and four new time-temperature parameter models are exploited). This metamodel allows the instantaneous and efficient evaluation of all twelve submodels simultaneously. The metamodel and twelve submodels are evaluated against four isotherms of alloy P91 stress-rupture data in the form of time-temperature parameterization isostress lines, points of convergence, and master curves for each model. A statistical analysis of the uncertainty of stress-rupture predictions with respect to the experimental uncertainty of the experimental database is performed. A key characteristic of time-temperature parameters is the regression analysis of stress versus the calculated parameter. An analysis of stress-parameter functions is performed to determine the optimal function that produces physically realistic predictions. Finally, a guideline to the selection of the most physically realistic time-temperature parameter and stress-parameter function for a given material is presented.
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ASME 2017 Pressure Vessels and Piping Conference
July 16–20, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5798-4
PROCEEDINGS PAPER
A Novel Metamodeling Approach for Time-Temperature Parameter Models Available to Purchase
Mohammad Shafinul Haque,
Mohammad Shafinul Haque
University of Texas at El Paso, El Paso, TX
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Christopher Ramirez,
Christopher Ramirez
University of Texas at El Paso, El Paso, TX
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Calvin M. Stewart
Calvin M. Stewart
University of Texas at El Paso, El Paso, TX
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Mohammad Shafinul Haque
University of Texas at El Paso, El Paso, TX
Christopher Ramirez
University of Texas at El Paso, El Paso, TX
Calvin M. Stewart
University of Texas at El Paso, El Paso, TX
Paper No:
PVP2017-65297, V005T11A021; 10 pages
Published Online:
October 26, 2017
Citation
Haque, MS, Ramirez, C, & Stewart, CM. "A Novel Metamodeling Approach for Time-Temperature Parameter Models." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 5: High-Pressure Technology; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); SPC Track for Senate. Waikoloa, Hawaii, USA. July 16–20, 2017. V005T11A021. ASME. https://doi.org/10.1115/PVP2017-65297
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