Plastic General Instability of Ring—Reinforced Conical Shells Under Uniform External Pressure

Authors: Ross, Carl T.F.; Little, Andrew P.F.; Allsop, Robert; Smith, Charles; Engelhardt, Marcus

Source: Marine Technology, Volume 44, Number 4, October 2007 , pp. 268-277(10)

Publisher: Society of Naval Architects and Marine Engineers (SNAME)

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Abstract:

The paper describes experimental tests carried out on three ring-reinforced circular conical shells that suffered plastic general instability under uniform external pressure. In this mode, the entire ring-shell combination buckles bodily in its flank. The cones were carefully machined from EN1A mild steel to a very high degree of precision. The paper also provides a design chart using the results obtained from these three vessels, together with the results of nine other vessels obtained from other tests. All 12 vessels failed by general instability. The design chart allows the possibility of obtaining a plastic knockdown factor, so that the theoretical elastic buckling pressures for perfect vessels can be divided by the plastic knockdown factor, to give the predicted buckling pressure. This method can also be used for the design of full-scale vessels.

Document Type: Research article

Publication date: 2007-10-01

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Marine Technology is dedicated to James Kennedy, 1867-1936, marine engineer, and longtime member of the Society, in recognition and appreciation of his sincere and generous interest in furthering the art of ship design, shipbuilding, ship operation, and related activities.

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Plastic General Instability of Ring—Reinforced Conical Shells Under Uniform External Pressure

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