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A comparison of simple methods to incorporate material temperature dependency in the Green’s function method for estimating transient thermal stresses in thick-walled power plant components

Rouse, James; Hyde, Christopher J.

A comparison of simple methods to incorporate material temperature dependency in the Green’s function method for estimating transient thermal stresses in thick-walled power plant components Thumbnail


Authors

JAMES ROUSE JAMES.ROUSE@NOTTINGHAM.AC.UK
Associate Professor

Christopher J. Hyde



Abstract

The threat of thermal fatigue is an increasing concern for thermal power plant operators due to the increasing tendency to adopt “two-shifting” operating procedures. Thermal plants are likely to remain part of the energy portfolio for the foreseeable future and are under societal pressures to generate in a highly flexible and efficient manner. The Green’s function method offers a flexible approach to determine reference elastic solutions for transient thermal stress problems. In order to simplify integration, it is often assumed that Green’s functions (derived from finite element unit temperature step solutions) are temperature independent (this is not the case due to the temperature dependency of material parameters). The present work offers a simple method to approximate a material’s temperature dependency using multiple reference unit solutions and an interpolation procedure. Thermal stress histories are predicted and compared for realistic temperature cycles using distinct techniques. The proposed interpolation method generally performs as well as (if not better) than the optimum single Green’s function or the previously-suggested weighting function technique (particularly for large temperature increments). Coefficients of determination are typically above 0.96, and peak stress differences between true and predicted datasets are always less than 10 MPa.

Citation

Rouse, J., & Hyde, C. J. (in press). A comparison of simple methods to incorporate material temperature dependency in the Green’s function method for estimating transient thermal stresses in thick-walled power plant components. Materials, 9(1), https://doi.org/10.3390/ma9010026

Journal Article Type Article
Acceptance Date Dec 22, 2015
Online Publication Date Jan 6, 2016
Deposit Date Jul 29, 2016
Publicly Available Date Jul 29, 2016
Journal Materials
Electronic ISSN 1996-1944
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 9
Issue 1
DOI https://doi.org/10.3390/ma9010026
Keywords Thermal fatigue; header; Green’s function method; power plant; P91
Public URL https://nottingham-repository.worktribe.com/output/773561
Publisher URL https://www.researchgate.net/publication/289569663
Contract Date Jul 29, 2016

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