Design modifications of pressure boilers with flat endplates with stress relief groove
Authors:
- Bogdan Szybiński,
- Mateusz Wygoda
Abstract
Stress concentration is still present in the vicinities of structural notches in engineering structures. Zones with higher level of stress are particularly dangerous for structures subjected to fatigue or dynamic loads. The vessels with flat endplates with stress relief grooves are the common examples of such structures. Unfortunately no clear evidence is given in existing codes how to optimally choose the circular groove radius and the optimal value of that radius depends on the dimensions of the boiler, operating conditions and the material used in manufacturing. Additionally, commonly used grooves with circular shapes are not optimal. Series of experimental tests, numerical or analytical studies presented in numerous papers confirmed these facts. In the presented paper the Authors proposed two stage modification of the investigated vessel. The first step relies on change of the shape of the groove in the endplate, which provides certain reduction of stress concentration but still plastic deformations in the groove vicinity are not eliminated. The second step of the design modification is proposed for the boiler with the optimal elliptic groove configuration. In this step some material is added around the top of the outer edge of the endplate. Two simple shapes are proposed for these parts - the short cylindrical ring or alternatively the circular ring welded on the top the endplate are used. For both concepts, the search of optimal dimension/parameters is performed. The numerical results of that study clearly show that the full elimination of plastic deformations in the vicinity of the groove is possible. The numerical analysis and optimizations were made with the well- established finite element software ANSYS, which is accepted by commonly used codes for designing of pressure vessels.
- Record ID
- CUTe2483d98f8104f65aed1c4a45e099346
- Publication categories
- ;
- Author
- Journal series
- Journal of KONES, ISSN 1231-4005, e-ISSN 2354-0133, Quarterly
- Issue year
- 2017
- Vol
- 24
- No
- 3
- Pages
- 309-316
- Other elements of collation
- rys.; wykr.; Bibliografia (na s.) - 315-316; Bibliografia (liczba pozycji) - 14; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 24, No. 3
- Keywords in English
- pressure boilers, flat ends, stress concentration, FEM analysis
- DOI
- DOI:10.5604/01.3001.0010.3090 Opening in a new tab
- Language
- eng (en) English
- Score (nominal)
- 14
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTe2483d98f8104f65aed1c4a45e099346/
- URN
urn:pkr-prod:CUTe2483d98f8104f65aed1c4a45e099346
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.