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

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 genera...

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Main Authors:	Rouse, James, Hyde, Christopher J.
Format:	Article
Language:	English
Published:	MDPI 2016
Online Access:	http://eprints.nottingham.ac.uk/35543/ http://eprints.nottingham.ac.uk/35543/ http://eprints.nottingham.ac.uk/35543/ http://eprints.nottingham.ac.uk/35543/1/J21%20%20Rouse%20-%20Materials%202015%20-%20eprints.pdf

id	nottingham-35543
recordtype	eprints
spelling	nottingham-355432017-10-13T21:47:12Z http://eprints.nottingham.ac.uk/35543/ 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. 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. MDPI 2016-01-06 Article PeerReviewed application/pdf en cc_by http://eprints.nottingham.ac.uk/35543/1/J21%20%20Rouse%20-%20Materials%202015%20-%20eprints.pdf Rouse, James and Hyde, Christopher J. (2016) 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). p. 26. ISSN 1996-1944 https://www.researchgate.net/publication/289569663 doi:10.3390/ma9010026 doi:10.3390/ma9010026
repository_type	Digital Repository
institution_category	Local University
institution	University of Nottingham Malaysia Campus
building	Nottingham Research Data Repository
collection	Online Access
language	English
description	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.
format	Article
author	Rouse, James Hyde, Christopher J.
spellingShingle	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
author_facet	Rouse, James Hyde, Christopher J.
author_sort	Rouse, James
title	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
title_short	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
title_full	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
title_fullStr	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
title_full_unstemmed	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
title_sort	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
publisher	MDPI
publishDate	2016
url	http://eprints.nottingham.ac.uk/35543/ http://eprints.nottingham.ac.uk/35543/ http://eprints.nottingham.ac.uk/35543/ http://eprints.nottingham.ac.uk/35543/1/J21%20%20Rouse%20-%20Materials%202015%20-%20eprints.pdf
first_indexed	2018-09-06T12:36:14Z
last_indexed	2018-09-06T12:36:14Z
_version_	1610861641646211072

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

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