Mechanism-Based Evaluation of Thermal Ratcheting due to Traveling Temperature Distribution

[+] Author and Article Information
Toshihide Igari

Nagasaki R&D Center, Mitsubishi Heavy Ind. Ltd., Fukahori-machi 5-717-1, Nagasaki 851-0392, Japane-mail: igari@ngsrdc.mhi.co.jp

Hiroshi Wada

Kobe Shipyard and Engine Works, Mitsubishi Heavy Ind. Ltd., Kobe 652, Japan

Masahiro Ueta

Fast Breeder Reactor Development Department, The Japan Atomic Power Company, Tokyo 100, Japan

J. Pressure Vessel Technol 122(2), 130-138 (Jan 27, 2000) (9 pages) doi:10.1115/1.556162 History: Received October 13, 1998; Revised January 27, 2000
Copyright © 2000 by ASME
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Temperature and stress distribution in the reactor vessel of FBR
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Temperature distribution; (a) step change, (b) linear change, (c) intermediate shape, (d) nonlinear shape
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General view of testing apparatus
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Elastic stress distribution; (a) temperature, (b) meridional bending stress, (c) hoop stress
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Radial displacement versus number of cycles
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Schematic deformation in the cold front cycling; (a) 1st cycle (no. 1), (b) 1st cycle (no. 2), (c) 1st cycle (residual deformation), (d) 2nd cycle (residual deformation)
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Deformation and hysteresis loop in the step change; (a) temperature and deformation, (b) hoop-membrane stress versus hoop membrane strain
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Yield stress reduction by axial bending stress
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Modified nonratcheting region
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Influence of traveling distance; (a) long travel, (b) short travel
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Hoop-membrane stress-strain behavior in the case of traveling hot-spot-shaped temperature; (a) temperature and deformation, (b) hoop-membrane stress-strain behavior
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Relationship between γ0 and βl
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Ratcheting region predicted by proposed equation
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Comparison of conventional with proposed equation
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Comparison of predicted ratcheting strains with those by FEM
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Comparison of predicted and experimental ratcheting strains




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