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Optimization of Flat Ends in Pressure Vessels

The application of flat ends in pressure boilers is inevitably associated with the presence of stress concentration, which is observed in the vicinity of the junction of the cylinder and the closing flat plate. The analyzed flat end plates with stress relief grooves fall into the group of solutions...

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Autores principales: Szybiński, Bogdan, Romanowicz, Paweł J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947306/
https://www.ncbi.nlm.nih.gov/pubmed/31847185
http://dx.doi.org/10.3390/ma12244194
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author Szybiński, Bogdan
Romanowicz, Paweł J.
author_facet Szybiński, Bogdan
Romanowicz, Paweł J.
author_sort Szybiński, Bogdan
collection PubMed
description The application of flat ends in pressure boilers is inevitably associated with the presence of stress concentration, which is observed in the vicinity of the junction of the cylinder and the closing flat plate. The analyzed flat end plates with stress relief grooves fall into the group of solutions recognized by the respective Standards of Calculations of Pressure Vessels. Unfortunately, no clear evidence is given in the Standards on how to choose the best groove parameters. This opens up the problem of the optimal choice of the groove parameters providing a minimum stress level. Even for the optimal values defining the stress relief groove geometry, certain plastic deformations are observed in the groove area for materials which exhibit elastic-plastic properties. Such a situation is completely unacceptable during exploitation, and a suitable reduction of the operating pressure is necessary. This paper discusses the effectiveness of other designs for flat ends used in pressure vessels. The proposed modifications took the form of external ribs applied around the top of the endplate circumference. The dimensions of these ribs were set using parametric optimization. The results of the study encouraged the authors to perform a more general analysis with the use of topology optimization. The results of all performed studies proved that the reduction of stress concentration and the full elimination of plastic deformation are possible. All numerical calculations were made using the finite element code (FEM), Ansys.
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spelling pubmed-69473062020-01-13 Optimization of Flat Ends in Pressure Vessels Szybiński, Bogdan Romanowicz, Paweł J. Materials (Basel) Article The application of flat ends in pressure boilers is inevitably associated with the presence of stress concentration, which is observed in the vicinity of the junction of the cylinder and the closing flat plate. The analyzed flat end plates with stress relief grooves fall into the group of solutions recognized by the respective Standards of Calculations of Pressure Vessels. Unfortunately, no clear evidence is given in the Standards on how to choose the best groove parameters. This opens up the problem of the optimal choice of the groove parameters providing a minimum stress level. Even for the optimal values defining the stress relief groove geometry, certain plastic deformations are observed in the groove area for materials which exhibit elastic-plastic properties. Such a situation is completely unacceptable during exploitation, and a suitable reduction of the operating pressure is necessary. This paper discusses the effectiveness of other designs for flat ends used in pressure vessels. The proposed modifications took the form of external ribs applied around the top of the endplate circumference. The dimensions of these ribs were set using parametric optimization. The results of the study encouraged the authors to perform a more general analysis with the use of topology optimization. The results of all performed studies proved that the reduction of stress concentration and the full elimination of plastic deformation are possible. All numerical calculations were made using the finite element code (FEM), Ansys. MDPI 2019-12-13 /pmc/articles/PMC6947306/ /pubmed/31847185 http://dx.doi.org/10.3390/ma12244194 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Szybiński, Bogdan
Romanowicz, Paweł J.
Optimization of Flat Ends in Pressure Vessels
title Optimization of Flat Ends in Pressure Vessels
title_full Optimization of Flat Ends in Pressure Vessels
title_fullStr Optimization of Flat Ends in Pressure Vessels
title_full_unstemmed Optimization of Flat Ends in Pressure Vessels
title_short Optimization of Flat Ends in Pressure Vessels
title_sort optimization of flat ends in pressure vessels
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947306/
https://www.ncbi.nlm.nih.gov/pubmed/31847185
http://dx.doi.org/10.3390/ma12244194
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