Metamodeling Time-Temperature Creep Parameters
- DLH Department of Engineering, Angelo State University, 2601 West Avenue N, San Angelo, TX 76909
- Department of Mechanical Engineering, The University of Texas at El Paso, 500 West University Avenue, El Paso, TX 79902
Abstract There exist many time-temperature parameter (TTP) models for creep rupture prediction of components including the Larson–Miller (LM), Manson–Haferd (MH), Manson–Brown (MB), Orr–Sherby–Dorn (OSD), Manson–Succop (MS), Graham–Walles (GW), Chitty–Duval (CD), Goldhoff–Sherby (GS) models. It remains a challenge to determine which model is “best”, capable of accurate interpolation and physically realistic extrapolation of creep rupture data for a given material. In this study, metamodeling is applied to create a unified TTP metamodel that combines and regresses into twelve TTP models (eight existing and four newly derived). An analysis of the mathematical problems that exist in TTP models is provided. A matlab code is written that can: (1) calibrate the material constants of any of the twelve TTP models (using the metamodel); (2) determine the most suitable stress-parameter function; (3) and report the normalized mean square error (NMSE) of rupture predictions for a given material database. Using the metamodel, and code, a design engineer can make an intelligent selection of the “best” TTP model for creep resistant design. This process is demonstrated using four isotherms of alloy P91 creep rupture data. To assess the influence of material, further validation is performed on alloys Hastelloy X, 304SS, and 316SS. It is determined that the “best” model is dependent on material type and the quality and quantity of available data.
- Research Organization:
- Univ. of Texas at El Paso, TX (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- DOE Contract Number:
- FE0027581
- OSTI ID:
- 1799872
- Journal Information:
- Journal of Pressure Vessel Technology, Vol. 142, Issue 3; ISSN 0094-9930
- Publisher:
- ASME
- Country of Publication:
- United States
- Language:
- English
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