Designing of stress relieve groove parameters for flat endplates of pressure boilers

• Autorzy: Szybiński B. , Barski M. , Wygoda M.

Identyfikatory

DOI

10.5604/12314005.1217296

• Języki publikacji: EN

Abstrakty

EN

The application of flat ends as closures in pressure boilers is a certain alternative for commonly used dished ends. However, it is inevitably joined with the stress concentration presence in the vicinity of the junction between the cylindrical pipe and the ending flat plate. The notch effect, which is observed in the connection area, is usually caused by the abrupt change of the inner wall shape and the lack of the curvature continuity in this region. The problem of the stress reduction in the transition zone between the cylindrical pipe and the endplate has been studied by researchers from many years and several proposals how to modify the shape of the respective elements have been established. On the base of these results, several designs for flat end closures are proposed in the codes applied in pressure boilers calculations. This paper shows the effectiveness of one of the design proposals, admitted by code EN 13445-3. In the proposed analysis the special attention are paid to flat ending plates with the circular stress relieve grooves. The parameters of the groove radii and location of its centre are set by a system of inequalities, which usually defines the region of admissible values for radii and position of the circular groove centre. The choice of these values strongly influences the stress concentration and in the considered code, no clear suggestions or justification is given how to choose the best groove parameters, providing the minimum stress concentration. In this report, the Authors show how to choose the best combination of the design parameters providing the minimum stress concentration.

Słowa kluczowe

EN

pressure boiler; flat ends; stress concentration; FEM analysis

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2016
• Tom: Vol. 23, No. 4
• Strony: 513--520
• Opis fizyczny: Bibliogr. 14 poz., rys.

Twórcy

autor

Szybiński B.

• Cracow University of Technology Department of Mechanical Engineering Jana Pawła II Avenue 37, 31-864 Krakow, Poland tel.: + 48 12 3743388, + 48 12 3743389, fax: + 48 12 3743360

autor

Barski M.

• Cracow University of Technology Department of Mechanical Engineering Jana Pawła II Avenue 37, 31-864 Krakow, Poland tel.: + 48 12 3743388, + 48 12 3743389, fax: + 48 12 3743360

autor

Wygoda M.

• Cracow University of Technology Department of Mechanical Engineering Jana Pawła II Avenue 37, 31-864 Krakow, Poland tel.: + 48 12 3743388, + 48 12 3743389, fax: + 48 12 3743360

Bibliografia

• [1] ANSYS, ver.12.1, Swanson Analysis Systems, 2009.
• [2] Błachut, J., Magnucki, K., Strength, stability, and optimization of pressure vessels: Review of selected problems, Applied Mechanics Review, 61, Nov. 2008.
• [3] Burchill, M., Heller M., Optimal notch shapes for loaded plate, Journal of Strain Analysis for Engineering Design, Vol. 39(1), pp. 99-116, 2003.
• [4] European Standard, EN 12952-3:2001, Water-tube boilers and auxiliary installations. Design and calculation of pressure parts, 2001.
• [5] European Standard, EN 13445-3, Unfired pressure vessels – Part 3: Design, CEN, 2002.
• [6] Kiesewetter, N., Traglastberechnungen fuer ebene Boeden im Behaelter- und Apparatebau, Technische Mechanik, 10, 1989.
• [7] Luedenbach, G., Failure incidents on flat header end caps with stress relief groove and test measures derived from these, VGB PowerTech, 7, 2004.
• [8] Lewiński, J., Magnucki, K., Shaping of a middle surface of a dished head of a circular pressure vessel, Journal of Theoretical and Applied Mechanics, Vol. 48(2), pp. 297-307, 2010.
• [9] Pedersen, N.L., Pedersen, P., Design of notches and grooves by means of elliptic shapes, Journal of Strain Analysis for Engineering Design, Vol. 43(1), pp. 1-14, 2008.
• [10] Preiss, R., Stress concentration factors of flat end to cylindrical shell connection with a fillet or stress relief groove subject to internal pressure. Intern. Journal for Pressure Vessels and Piping, Vol. 73(3), pp. 183-190, 1997.
• [11] Schwaigerer, S., Festigkeitsberechnung im Dampfkessel-, Behaelter- und Rohrleitungsbau, (3rd Ed.), Springer, 1978.
• [12] Szybiński, B., Wróblewski, A., Parametric optimization of stress relief groove shape in flat ends of boilers, Journal of Strain Analysis for Engineering Design, Vol. 47(1), pp. 55-63, 2012.
• [13] Szybiński, B., Romanowicz, P., Zieliński, A.P., Numerical and experimental analysis of stress and strains in flat ends of high-pressure vessels, Key Engineering Materials, Vol. 490, pp. 226-236, 2012
• [14] Szybiński, B., Design of flat ends in pressure boilers with circular and elliptical stress relieve grooves, Applied Mechanics and Materials, Vol. 477-478, pp. 49-53, 2014.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.