Experimental investigation of the strength and stability of submarine pressure hulls with and without artificial corrosion damage

MacKay, John R.; Smith, Malcolm J.; Keulen, Fred van; Bosman, T.N.; Pegg, Neil

doi:10.1016/j.marstruc.2010.06.001

Cited by 45 publications

(23 citation statements)

References 7 publications

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“…Detailed descriptions of the measured specimen geometry and material are presented in [6][7][8][9]. Twelve of the specimens were fabricated from AA-6082-T6 aluminum.…”

Section: Test Specimens and Experimental Methodsmentioning

confidence: 99%

“…Twelve of the specimens were fabricated from AA-6082-T6 aluminum. Collapse testing results for those specimens were presented in [4], and serve as a benchmark against which to compare test results for eight new specimens fabricated from the lower grade AA-6082-F28 aluminum. The T6 and F28 materials are compared in Sec.…”

Section: Test Specimens and Experimental Methodsmentioning

confidence: 99%

“…Hull collapse strength was found to be reduced through high local stresses in the corroded region, as well as by the effective increase in out-of-circularity (OOC) imperfections associated with one-sided thinning. However, because experimental results for corroded hulls were not available until recently [4], numerical models could not be properly validated and modeling procedures were uncertain.…”

Section: Introductionmentioning

confidence: 99%

“…In [4], general corrosion damage was artificially introduced into ring-stiffened cylinders that were machined from aluminum tubing and tested to collapse in a pressure chamber. Aluminum was chosen since it is easy to machine, and since it is a strain hardening material that behaves like high-strength steels used in real pressure hulls.…”

Section: Introductionmentioning

confidence: 99%

“…The tests in [4] showed that overall collapse, which is characterized by a general elasto-plastic buckling of the ring-stiffeners and shell plating, is more sensitive to corrosion thinning than interframe collapse, whereby the shell plating buckles inelastically while the ring-stiffeners initially remain intact. The percentage reduction in overall collapse pressures was approximately equal to the percentage of shell thinning for a variety of corrosion patch sizes.…”

Section: Introductionmentioning

confidence: 99%

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The Sensitivity of Overall Collapse of Damaged Submarine Pressure Hulls to Material Strength

MacKay

Keulen

2013

Journal of Offshore Mechanics and Arctic Engineering

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Budget and schedule restrictions sometimes require naval submarines to be operated with unrepaired corrosion damage to the pressure hull. It is important to understand the effects of corrosion wastage on the structural capacity of the hull, so that appropriate diving depth restrictions can be imposed if necessary. The current paper presents an experimental study of the interaction of material behavior with corrosion defects, especially with respect to their effect on overall elasto-plastic collapse of pressure hulls. Twenty ring-stiffened cylinders, representative of submarine pressure hulls failing by overall collapse, were machined ffom high-and low-grade aluminum alloy tubes. Artificial general corrosion damage was introduced in selected specimens by machining away material from the outside of the cylinder shell in rectangular patches of uniform depth. The cylinders were monotonically loaded to collapse under external hydrostatic pressure. One corroded cylinder was repeatedly loaded past the yield limit before the collapse test in order to study the effect of cyclic plastic loading on its ultimate collapse strength. Overall collapse pressures for corroded cylinders with a variety of patch sizes and depths and material strengths were reduced by, on average, 0.85 times the depth of thinning divided by the original shell thickness. The collapse strength of corroded cylinders was found to be more sensitive to the shape of the stress-strain curve than for intact specimens. Higher levels of strain hardening and ductility were found to improve the performance of damaged cylinders. Permanent deformations in the cyclically loaded cylinder, as measured with strain gauges, grew with each constant-amplitude load cycle; however, the additional deformations tended towards zero with increasing number of cycles, and a subsequent collapse test indicated that the cyclic loading did not affect the collapse pressure. The sensitivity of overall collapse to material strength is related to not only the yield stress, but also the plastic reserve of the material; higher levels of strain hardening and ductility increase overall collapse strength of hulls, especially those with general corrosion damage. The effect of a given level of corrosion thinning is less severe for cylinders with relatively greater levels of strain hardening. It is unlikely that cyclic plastic loading of corroded hulls will lead to premature collapse at a load level below the monotonie collapse pressure.

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“…Detailed descriptions of the measured specimen geometry and material are presented in [6][7][8][9]. Twelve of the specimens were fabricated from AA-6082-T6 aluminum.…”

Section: Test Specimens and Experimental Methodsmentioning

confidence: 99%

Section: Test Specimens and Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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