Tests of Ring-Stiffened and Sandwich Composite Cylinders Under External Hydrostatic Pressure

Krenzke, Martin A.; Kiernan, Thomas J.

doi:10.21236/ad0423524

Cited by 13 publications

(13 citation statements)

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“…Many of the models ruptured during collapse. Models labelled SS-43 through SS-56 [12] did not collapse and did not rupture, though buckling was observed. The test on each model did not end until the centre deflection was greater than the initial rise of the dome.…”

Section: Krenzke and Kiernan [12] And [13]mentioning

confidence: 94%

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04.21: Buckling of externally pressurised spherical shells: Experimental results compared with recent design recommendations

2017

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The buckling resistance of a steel spherical dome shell under external pressure is controlled by the geometry, material properties and fabrication quality class [1,2]. A simple algorithm to determine the buckling resistance of such shells with a clamped boundary, in terms of the description used in [1], was recently developed by the authors [3,4]. The assessment is based on the elastic critical pressure p Rcr and the plastic resistance pressure p Rpl , followed by evaluation of the imperfection sensitivity for the assumed fabrication quality class, assessment of the other buckling parameters that define the capacity curve, deduction of the characteristic value of the buckling resistance p Rk , and determination of the design buckling resistance p Rd . The new procedure was previously [3,4] compared with the current design recommendations [2] and was found to give 30-45% higher buckling resistances in some cases, making the new proposals less conservative. The safety of the new proposals is here compared with many previous experimental results that have been presented in the literature. It is found that the new proposals are safe and more economic than the current rules.

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Section: Krenzke and Kiernan [12] And [13]mentioning

confidence: 94%

“…The largest set of tests appears to have been those of Krenzke & Kiernan [12,13], published in 1963. A total of 73 clamped spherical aluminium dome models were tested with included angles ranging from 5 to 120 degrees.…”

Section: Krenzke and Kiernan [12] And [13]mentioning

confidence: 99%

04.21: Buckling of externally pressurised spherical shells: Experimental results compared with recent design recommendations

2017

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“…Krenzke and Kiernan (1963) proposed γ = 0.7 as an empirical lower-bound knockdown factor for designing spherical shells. However, it was later argued that early experimental results were too scattered, mainly due to the lack of precise control of imperfections during fabrication (Kaplan and Fung, 1954;Homewood et.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…However, it has been found that the buckling pressure of stiffened spherical shells is actually smaller than for unstiffened shells with the same weight (Krenzke and Kiernan, 1963). Other configurations of the stiffeners may perform better, but the number of studies of externally pressurized, stiffened spherical shells is currently quite limited (Singer et al, 2002;Ventsel and Krauthammer, 2001).…”

Section: A C C E P T E D Mmentioning

confidence: 99%

Searching for imperfection insensitive externally pressurized near-spherical thin shells

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Pellegrino

2018

Journal of the Mechanics and Physics of Solids

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This paper studies the buckling behavior and imperfection sensitivity of geodesic and stellated shells subject to external pressure. It is shown that these structures can completely eliminate the severe imperfection sensitivity of spherical shells and can achieve buckling pressure and mass efficiency higher than the perfect sphere. Key results of this paper are as follows. First, a shell with the shape of an icosahedron can carry external pressure significantly higher than a spherical shell, when the effects of geometric imperfections are considered.Second, stellated shells are generally insensitive to imperfections. For pyramids with height-to-radius ratios greater than 35% the buckling pressure is greater than for a perfect sphere. The specific ratio 45% gives the highest buckling pressure, 28% higher than the perfect sphere. Third, stellated icosahedra with concave pyramids have higher mass efficiency than the perfect sphere. Fourth, in terms of volume efficiency, geodesic shells are comparable to spherical shells with a knockdown factor of 0.2 and convex stellated shells are comparable to spherical shells with a knockdown factor of 0.65.

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“…However, sufficient experimental work has been conducted to indicate that potential weight savings can be achieved if stiffeners are spaced at relatively close intervals and distributed in a particular array or grid-like pattern. 2 , 3 On the other hand, when the unsupported arc length between * stiffeners is large, stiffening systems may be ineffective and may even weaken the shell.…”

Section: Introductionmentioning

confidence: 99%

Hydrostatic Tests of a High Strength Steel Internally Stiffened Hemisphere

Schwartz¹

1967

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A stiffened steel hemisphere with a nominal yield strength of 150,000 psi was designed, fabricated, and tested to explore the structural efficiency of stiffened spherical shells. Test results show that the collapse pressure was approximately 30 percent greater than that predicted for an unstress-relieved, monocoque shell of equivalent weight with the same out of roundness. The collapse pressure approached that of a near-perfect, machined spherical shell.

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Tests of Ring-Stiffened and Sandwich Composite Cylinders Under External Hydrostatic Pressure

Cited by 13 publications

References 0 publications

04.21: Buckling of externally pressurised spherical shells: Experimental results compared with recent design recommendations

04.21: Buckling of externally pressurised spherical shells: Experimental results compared with recent design recommendations

Searching for imperfection insensitive externally pressurized near-spherical thin shells

Hydrostatic Tests of a High Strength Steel Internally Stiffened Hemisphere

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