The Application of Physically Based CDM Modeling in Prediction of Materials Properties and Component Lifetime

[+] Author and Article Information
J. Yang, J. S. Hsiao, M. Fong, T. B. Gibbons

Power Plant Laboratories, ALSTOM Power Inc., Windsor, CT 06095

J. Pressure Vessel Technol 126(3), 369-375 (Aug 18, 2004) (7 pages) doi:10.1115/1.1767178 History: Received April 26, 2002; Revised December 18, 2003; Online August 18, 2004
Copyright © 2004 by ASME
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Creep strain (a), von Mises stress (b) and macrosection (c), showing failure profile for externally-notched tube. Dotted lines in (c) show initial (inner lines) and final (outer lines) profiles predicted by the model.
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Creep strain (a), von Mises stress (b), and macrosection (c) showing failure profile for internally-notched tube. Dotted lines in (c) show initial and final profiles predicted by the model.
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Examples of creep curves predicted using CDM with experimental data for comparison: (a) HCM12A at 600°C and 185 MPa; and (b) NF616 simulated HAZ at 612°C and 120 MPa.
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Predicted scatterband for T22 at 600°C with experimental data; symbols represent different casts.
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Strain time trajectory for creep test with stress change showing good correlation between predicted (dashed line) and experimental values; HCM12A at 600°C.
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Predicted stress-rupture life at 600°C for welded testpieces of HCM12A (solid line) along with test data for comparison
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Mesh configurations used in FE analysis of model components: (a) internally notched tube; (b) externally notched tube; (c) and (d) blunt-notch testpieces.
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Life to rupture as a function of stress for two designs of blunt-notch testpieces of HCM12A tested at 600°C
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Output showing strain (i.e. damage) accumulation for plain tube with 10 percent eccentricity immediately prior to failure. Darkest shading represents failed elements and predicted failure profile is similar to that of the failed component.



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