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Purpose: The aim of this paper is to present the results of the comparative test between the PN-EN 12952-3:204/Ap1:2005 standard and FEM analysis as procedural tools for determining the stress concentration factor for the drum-pipe joint of a steam boiler. Design/methodology/approach: Geometrical properties of the drum and the pipe are defined. In the first step the stress concentration factor is calculated using the formulas presented in the PN-EN 12952-3:204/Ap1:2005 standard. Then two grid models are defined for unweakened (the drum alone) and weakened (the drum with the pipe) elements. Next, the maximum stresses are computed by FEM analysis conducted in the ANSYS system. A quotient of the maximum stresses gives the FEM-based stress concentration factor. A whole family of factors is created with a stable quotient between element wall thicknesses. Comparative plots of the families are created for both cases: standard-based and FEM-based approaches. Findings: There is rather a good conformity between plots derived from the PN-EN standard and from FEM analysis, with some slight differences due to the approximating character of the semi-empirical formulas presented in the PN-EN standard. Research limitations/implications: The plot presented for the PN-EN standard has limited precision for the geometry of the individual element. The standard presents as an alternative some semi-empirical formulas which are described as ‘approximating’. Ultimately, the numerical methods are more precise tools for determining the stress concentration factor. Practical implications: The results obtained allow the maximum stresses in the cycle to be determined precisely, due to the dependency of the final value on the preceding values in the computation procedure of the stress concentration factor. Originality/value: The calculated formulas may be significantly useful for determining the allowable cooling/heating rates of power plant devices.
Wydawca
Rocznik
Tom
Strony
48--51
Opis fizyczny
Bibliogr. 16 poz., rys., tabl.
Twórcy
autor
- Department of Mechanical Engineering, Cracow University of Technology, Al. Jana Pawła II 37, 31-864 Kraków, Poland, dwornick@mech.pk.edu.pl
Bibliografia
- [1] A. L. Kohan, Boiler Operator’s Guide, McGraw-Hill, New York, 1998.
- [2] B. Węglowski, J. Taler, P. Duda, Monitoring of Thermal Stresses in Steam Generators, Proceedings of the 17th International Conference “Structural Mechanics in Reactor Technology” SMiRT 17, Prague, Czech Republic, 2003.
- [3] R. Dwornicka, The Calculation of Allowable Cooling and Heating Rates for a Gate Valve SKS1 Made from Steel 13 HMF WDG TRD, in: Modern Achievements in Science and Education, Khmelnitsky National University Publishing House, Khmelnitsky, 2008, 39-43.
- [4] R. Dwornicka, The Calculation of Allowable Cooling and Heating Rates for a Gate Valve SKS1 Made from Steel 13 HMF WDG UE, in: Modern Achievements in Science and Education, Khmelnitsky National University Publishing House, Khmelnitsky, 2008, 35-39.
- [5] R. Dwornicka, The Comparison of TRD 301 Regulations and PN-EN 12952-3:204/AP1:2005 Standard with the Example of SKS1 Main Steam Valve, in: The Improvement of The Quality, Reliability and Long Usage of Technical Systems and Technological Processes, Khmelnitsky National University Publishing House, Khmelnitsky, 2008, 108-114.
- [6] J. Taler, P. Duda, E. Roos, Inverse Method for Temperature and Stress Monitoring in Complex-Shape Bodies, Nuclear Engineering and Design 3960 (2003) 1-17.
- [7] PN-EN 12952-3:204/Ap1:2005.
- [8] ANSYS User's Manual for Revision 5.0, ANSYS, Inc., Canonsburg, 2005.
- [9] P. Duda, Monitoring of the thermal resistance working conditions for the pressurized elements of the power plant devices, Cracow University of Technology Press, Cracow, 2004 (in Polish).
- [10] E. Zbroińska-Szczechura, J. Dobosiewicz, Steam boilers’ drums complete damage, Power Engineering 4 (1991) 118 (in Polish).
- [11] J. Dobosiewicz, J. Trzeszczyński, The durability of steam boilers’ drums, Power Engineering 8 (1991) 287 (in Polish).
- [12] S. Timoshenko, J. N. Goodier, Theory of elasticity, McGraw Hill Book Company, New York 1951.
- [13] W. Nowacki, Theory of elasticity, PWN, Warsaw, 1970 (in Polish).
- [14] J. Szargut (ed.), Numerical modelling of the temperature fields, WNT, Warsaw, 1992 (in Polish).
- [15] P. Duda, A. Cebula, R. Dwornicka, Optimization of heating and cooling operations of power block pressure elements, Proceedings of the European Conference “Computational Fluid Dynamics” ECCOMAS CFD 2006, Netherlands, 2006.
- [16] I. S. Raju, J. C. Newman, Stress Intensity Factors for a Wide Range of Semielliptical Surface Cracks in Finit-thickness Plates, Engineering Fracture Mechanics 11/4 (1979) 817-829.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BOS2-0021-0006