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Research Papers: Design and Analysis

Burst Pressures for Toriconical Shells: Experimental and Numerical Approach

[+] Author and Article Information
J. Błachut

Faculty of Management,
AGH University of Science and Technology,
Kraków 30-067, Poland
e-mail: em20@liverpool.ac.uk

O. Ifayefunmi

Faculty of Engineering Technology,
Universiti Teknikal Malaysia Melaka,
Melaka 76100, Malaysia

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 25, 2016; final manuscript received June 4, 2017; published online August 1, 2017. Assoc. Editor: David L. Rudland.

J. Pressure Vessel Technol 139(5), 051203 (Aug 01, 2017) (8 pages) Paper No: PVT-16-1098; doi: 10.1115/1.4037043 History: Received June 25, 2016; Revised June 04, 2017

The paper describes burst pressures of eight mild steel toriconical shells and proposes a criterion for their ultimate loss of structural integrity based on true stress–strain material relationship. All test models were initially loaded by quasi-static external pressure until they buckled/collapsed. They were subsequently internally pressurized until burst. The details about the numerical process, which simulates the two-stage loading process, i.e., starting with buckling by external pressure being followed by reloading using internal pressure for up to the burst, are given. The paper concentrates on numerical procedure, which allows computation of the burst pressure using extensive plastic straining. It is shown that burst pressures based on the excessive plastic straining are closer to reality (and experiments) than those based on plastic instability.

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Figures

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Fig. 1

Geometry of a toriconical shell (a) and view of T2a test model embedded into the base plate and before being bolted (b)

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Fig. 2

Buckled toricones T1 and T1a

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Fig. 3

Plastic strain criteria, εpu and εpf, adopted for burst pressures

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Fig. 4

Arrangements for measuring internal volume of buckled test model, T1

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Fig. 5

View of arrangements for burst tests (a), model T2a bolted to the base plate (b), and the external tank attached to the base (c)

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Fig. 6

Photographs of toricone T3a: as-manufactured (a), after buckling (b), and after burst (c)

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Fig. 7

Test model T2a after burst/leak—side view (a). Two leak areas encircled and enlarged ((b) and (c)).

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Fig. 8

External pressure versus the amount of expelled oil for toricone T2a

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Fig. 9

View of collapsed toricone T2a (a) and the FE-simulated postcollapse shape with approximately the same deformed pattern and its volume (b)

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Fig. 10

Distribution of equivalent plastic strains through the wall thickness at a number of internal pressure steps

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Fig. 11

Side view of model T2a at: prestart (a) and at burst pressures ((b) and (c)). Locations of midsurface PEEQ corresponding to pprestart, ppb1, and pb2 are marked.

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Fig. 12

Comparison of computed change of internal volume with experimental data

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