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Research Papers: Design and Analysis

Investigation of Reduction in Buckling Capacity of Cylindrical Shells Under External Pressure Due to Partially Cut Ring Stiffeners

[+] Author and Article Information
Snehankush Chikode

Department of Mechanical Engineering,
Sardar Patel College of Engineering,
University of Mumbai,
Mumbai 400058, India
e-mail: snehankush.s.chikode@gmail.com

Nilesh Raykar

Department of Mechanical Engineering,
Sardar Patel College of Engineering,
University of Mumbai,
Mumbai 400058, India
e-mail: nilesh_raykar@spce.ac.in

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 31, 2015; final manuscript received May 9, 2016; published online August 5, 2016. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 139(1), 011202 (Aug 05, 2016) (7 pages) Paper No: PVT-15-1207; doi: 10.1115/1.4033653 History: Received August 31, 2015; Revised May 09, 2016

Circumferential ring stiffeners are commonly used to improve the buckling strength of cylindrical shells. Under special circumstances, stiffener ring needs to be partially cut in order to avoid interference with vessel attachments or surrounding structures. No clear guideline is available in rule-based method to deal with such case. This paper investigates the extent of reduction in buckling capacity for a range of cylindrical shell geometries with stiffener rings having different cross sections and different extents of circumferential cut. Finite-element (FE)-based analysis as per ASME Section VIII, Division 2, Part 5 has been employed to determine the permissible external pressure in each of the cases. Effects of ring cross section and extent of circumferential cut of stiffening ring on the maximum permissible external pressure have been presented. A total of 63 combinations of shell-stiffening ring configurations of different L/D, D/t ratios, cross section shape, and extent of cut have been investigated. Geometrical parameters for these combinations under study are so chosen that normal working range in industries is covered. The results obtained provide guidelines to design shells with partially cut stiffening rings.

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References

Figures

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Fig. 7

Correlation of D/t ratios and weakening effect of cutting of stiffeners for L/D = 0.5 (combinations C1, C2, C3, C22, C23, C24, C43, C44, and C45)

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Fig. 8

Correlation of D/t ratios and weakening effect of cutting of stiffeners for L/D = 1 (combinations C8, C9, C10, C29, C30, C31, C50, C51, and C52)

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Fig. 9

Correlation of D/t ratios and weakening effect of cutting of stiffeners for L/D = 2 (combinations C15, C16, C17, C36, C37, C38, C57, C58, and C59)

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Fig. 3

Boundary conditions applied on nodes

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Fig. 2

Circumferential cut in stiffener ring

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Fig. 1

Different cross sections for stiffener ring

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Fig. 4

Effect of stiffener height variation on allowable external pressure

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Fig. 5

Comparison of maximum allowable external pressure obtained from FE analysis and rule-based method

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Fig. 6

Buckling mode shapes

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Fig. 10

Correlation of L/D ratios and weakening effect of cutting of stiffeners for D/t = 100 (combinations C1, C2, C3, C8, C9, C10, C15, C16, and C17)

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Fig. 11

Correlation of L/D ratios and weakening effect of cutting of stiffeners for D/t = 200 (combinations C22, C23, C24, C29, C30, C31, C36, C37, and C38)

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Fig. 12

Correlation of L/D ratios and weakening effect of cutting of stiffeners for D/t = 300 (combinations C43, C44, C45, C50, C51, C52, C57, C58, and C59)

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Fig. 13

Effect of cross section shape of stiffener rings for D/t = 100 (combinations C1, C4, C5, C6, C7, C8, C11, C12, C13, C14, C15, C18, C19, C20, and C21)

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Fig. 14

Effect of cross section shape of stiffener rings for D/t = 100 (combinations C22, C25,C26, C27, C28, C29, C32, C33, C34, C35, C36, C39, C40, C41, and C42)

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Fig. 15

Effect of cross section shape of stiffener rings for D/t = 300 (combinations C43, C46, C47, C48, C49, C50, C53, C54, C55, C56, C57, C60, C61, C62, and C63)

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