Creep-fatigue damage is one of the dominant failure modes for pressure vessels and piping used at elevated temperatures. In the design of these components the inelastic behavior should be estimated accurately. An inelastic finite element analysis is sometimes employed to predict the creep behavior. However, this analysis needs complicated procedures and many data that depend on the material. Therefore the design is often based on a simplified inelastic analysis based on the elastic analysis result, as described in current design codes. A new, simplified method, named, Stress Redistribution Locus (SRL) method, was proposed in order to simplify the analysis procedure and obtain reasonable results. This method utilizes a unique estimation curve in a normalized stress-strain diagram which can be drawn regardless of the magnitude of thermal loading and constitutive equations of the materials. However, the mechanism of SRL has not been fully investigated. This paper presents results of the parametric inelastic finite element analyses performed in order to investigate the mechanism of SRL around a structural discontinuity, like a shell-skirt intersection, subjected to combined secondary bending stress and peak stress. This investigation showed that SRL comprises a redistribution of the peak and secondary stress components and that although these two components exhibit independent redistribution behavior, they are related to each other.
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ASME 2008 Pressure Vessels and Piping Conference
July 27–31, 2008
Chicago, Illinois, USA
Conference Sponsors:
- Pressure Vessels and Piping
ISBN:
978-0-7918-4826-5
PROCEEDINGS PAPER
Finite Element Analysis of Local Inelastic Strain Based on Stress Redistribution Locus
Shunji Kataoka,
Shunji Kataoka
JGC Corporation, Yokohama, Japan
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Takuya Sato
Takuya Sato
JGC Corporation, Yokohama, Japan
Search for other works by this author on:
Shunji Kataoka
JGC Corporation, Yokohama, Japan
Takuya Sato
JGC Corporation, Yokohama, Japan
Paper No:
PVP2008-61329, pp. 463-469; 7 pages
Published Online:
July 24, 2009
Citation
Kataoka, S, & Sato, T. "Finite Element Analysis of Local Inelastic Strain Based on Stress Redistribution Locus." Proceedings of the ASME 2008 Pressure Vessels and Piping Conference. Volume 3: Design and Analysis. Chicago, Illinois, USA. July 27–31, 2008. pp. 463-469. ASME. https://doi.org/10.1115/PVP2008-61329
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