Pressure Vessels under External Pressure

Ross, Carl T.F.

doi:10.4203/csets.5.14

Cited by 28 publications

(77 citation statements)

References 8 publications

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“…The work in this paper was based mostly on past experiments carried out by Ross et al [1,11,12]; most of the models were made from EN1A mild steel and were machined to specification and checked for dimensional tolerance. The models were tested to destruction in tanks similar to that shown in Fig.…”

Section: Previous Experimental Investigationsmentioning

confidence: 99%

“…KENDRIC1 and KENDPT3 employ Kendrick's Part I and Part III theories, respectively. Windenburg and Trilling [9] introduced a thinness ratio "λ" to consider the effects of out-of-roundness on un-stiffened cylinders and Ross [10] modified this to cater for the plastic general instability of ring-stiffened cylinders; he called this his thinness ratio "λ 1 ".…”

Section: Introductionmentioning

confidence: 99%

“…Nearly half of these waters are over 3,000 meters (9,800 ft) deep [1,2], but only about one percent of the Earth's Oceans have been explored. Considerable research has been carried out in the oceans over the last 40 years, to understand processes responsible for plate tectonics and ocean chemistry, as well as the origins of life and mechanisms for speciation.…”

Section: Introductionmentioning

confidence: 99%

“…Ross [1] developed two computer programs namely; KENDRIC1 and KENDPT3 to calculate the critical buckling pressure due to general instability automatically. KENDRIC1 and KENDPT3 employ Kendrick's Part I and Part III theories, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Buckling by General Instability of Cylindrical Components of Deep Sea Submersibles

Ross

Okoto

Little

2008

AMM

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Abstract.This paper reports on theoretical and experimental investigations into the buckling characteristics of a series of six ring-stiffened circular cylinders that experienced general instability when subjected to external hydrostatic pressure. Each study used between 3-5 designs with the same internal and external diameters, but with different numbers and sizes of ring-stiffeners. Four used designs that were machined to a high degree of precision from steel, while the other two were machined from aluminium alloy. The theoretical investigations focused on obtaining critical buckling pressure values, namely P cr , for each design from the well-known Kendrick's Part I and Part III theories, together with an ANSYS finite element prediction. The thinness ratio λ 1 , which was originally derived by the senior author, was calculated together with a dimensionless quantity called the plastic knockdown factor (PKD), for each model. The plastic knockdown factor was calculated by dividing the theoretical critical buckling pressures P cr, by the experimental buckling pressures P exp . The thinness ratio was used because vessels such as these, which have small but significant random out-of-circularity, defy "exact" theoretical analysis and it is because of this that the design charts were produced. Three design charts were constructed by plotting the reciprocal of the thinness ratio (1/ λ 1 ) against the plastic knockdown factor (P cr / P exp ), using results from Kendrick Part I, Kendrick Part III, and ANSYS. Comparison of the results obtained using Kendrick's theories and experimentally obtained results was good.

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Section: Previous Experimental Investigationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Buckling by General Instability of Cylindrical Components of Deep Sea Submersibles

Ross

Okoto

Little

2008

AMM

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“…Its shape functions are quadratic in both in-plane directions. This finite element has capabilities for analyzes considering plasticity, stress stiffening, large deflection, and large strain (ANSYS, 2005;Ross, 2011). In Figure 5 an example of a computational domain discretized with the quadrilateral SHELL93 finite element, showing the generated mesh in the perforated plate.…”

Section: Computational Modelingmentioning

confidence: 99%

Study About Buckling Phenomenon in Perforated Thin Steel Plates Employing Computational Modeling and Constructal Design Method

Helbig

Silva

Real

et al. 2016

Lat. Am. j. solids struct.

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Perforated steel thin plates are commonly used in structural engineering. Due to their geometric characteristics, these panels can suffer the undesired buckling phenomenon. In this context, the present work associates the computational modeling and the constructal design method to evaluate the influence of the geometric configuration in the plate buckling behavior, using the exhaustive search method to determine which geometries conduct to superior mechanical behavior. To do so, numerical models are employed to solve elastic and elasto-plastic buckling of plates having a centered perforation. Different hole types (longitudinal oblong, transversal oblong, elliptical, rectangular, diamond, longitudinal hexagonal, or transversal hexagonal) with different shapes (variation of characteristics dimensions of each hole type) are analyzed. Limit curves to avoid buckling were obtained, as well as the definition of the geometries that can improve up to 107% the plate performance.

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Buckling of Stiffened Thin-Walled Truncated Cones Subjected to External Pressure

2007

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The results of external air pressure buckling tests of thin-walled, truncated conical steel shells are presented, along with a description of the equipment developed for the testing program. The testing was conducted in support of Sandia National Laboratories Z-Pinch Inertial Fusion Energy Proof-of-Principle power plant design. Optimized stiffening ring locations were determined by using the finite element method, and were then tested, indicating an experimental improvement in initial buckling pressure of more than 300% over the unstiffened cone. An analytical method of determining buckling pressures of stiffened conical shells is also presented, based on the method of the equivalent cylindrical shell. The results of the analytical method agreed very closely to the finite element method for the stiffened cones, but are 20-40% higher than the experimental results.

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Pressure Vessels under External Pressure

Cited by 28 publications

References 8 publications

Buckling by General Instability of Cylindrical Components of Deep Sea Submersibles

Buckling by General Instability of Cylindrical Components of Deep Sea Submersibles

Study About Buckling Phenomenon in Perforated Thin Steel Plates Employing Computational Modeling and Constructal Design Method

Buckling of Stiffened Thin-Walled Truncated Cones Subjected to External Pressure

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