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Research Papers: Materials Technology

Ultimate Compressive Capacity of Rectangular Plates With Partial Depth Pits

[+] Author and Article Information
Xiaoli Jiang

School of Transportation,
Wuhan University of Technology,
Wuhan, Hubei, PRC 1111
e-mail: Xiaoli.jiang@whut.edu.cn

C. Guedes Soares

Centre for Marine Technology and Engineering,
Technical University of Lisbon,
Instituto Superior Técnico,
Lisboa, Portugal 1049-001
e-mail: guedess@mar.ist.utl.pt

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the Journal of Offshore Mechanics and Arctic Engineering. Manuscript received April 22, 2012; final manuscript received July 16, 2012; published online February 25, 2013. Assoc. Editor: Xin Sun.

J. Offshore Mech. Arct. Eng 135(2), 021401 (Feb 25, 2013) (6 pages) Paper No: OMAE-11-1033; doi: 10.1115/1.4007594 History: Received April 22, 2012; Revised July 16, 2012

Pitting corrosion has been one of the main corrosion types of immersed ship hulls, which can bring heavy damage and even accidents to in-service ships, particularly to aged ships. The aim of the present paper was to investigate the effects of pits on the ultimate compressive strength of mild steel plates under uniaxial compression. A series of nonlinear FEM analyses on plates with partial depth corrosion pits were carried out, changing the size, intensity and location of pits and the slenderness of plates. It was shown that the eccentricity induced by single side distributed pits had considerable degrading effects on the ultimate compressive capacity of plates. Although the degree of pit corrosion (DOP) did reflect the effect of pits to a large extent, it was not enough to rely on DOP exclusively to represent the extent of damage caused by pits, as “volume effect” should be considered.

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References

Harada, S., Yamamoto, N., Magaino, A., and Sone, H., 2001, “Corrosion Analysis and Determination of Corrosion Margin, Part 1&2,” IACS Discussion Paper.
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Luís, R. M., Guedes Soares, C., and Nikolov, P. I., 2007, “Collapse Strength of Longitudinal Plate Assemblies With Dimple Imperfections,” Advancements in Marine Structures, C.Guedes Soares and P. K.Das, eds., Taylor & Francis, London, UK, pp. 207–215.
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Paik, J. K., Lee, J. M., and Ko, M. J., 2003, “Ultimate Compressive Strength of Plate Elements With Pit Corrosion Wastage,” Proc. Instn. Mech. Engrs., Part M: J. Eng. Marit. Environ., 217(4), pp. 185–200. [CrossRef]
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Nakai, T., Matsushita, H., and Yamamoto, N., 2004, “Effect of Pitting Corrosion on Local Strength of Hold Frames of Bulk Carriers (2nd Report)—Lateral-Distortional Buckling and Local Face Buckling,” Mar. Struct., 17, pp. 612–641. [CrossRef]
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Jiang, X., and Guedes Soares, C., 2008, “Nonlinear FEM Analysis of Pitted Mild Steel Plate Subjected to In-Plane Compression,” Proceedings of TEAM 2008, Istanbul, Turkey, Oct. 6–9.
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Figures

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Fig. 1

Average stress and strain curves under uniaxial compression of pitted plate with DOP 15.9% (top from Ref. [12], bottom is result of present work); (a) plate with double side distributed pits, (b) plate with single side distributed pits

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Fig. 2

1/4 Model of pitted rectangular plate

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Fig. 3

Stress-strain (normalized by yield values) curves under uniaxial compression of plate with β = 1.34

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Fig. 4

Stress-strain (normalized by yield values) curves under uniaxial compression of plate with β = 2.34

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Fig. 5

Stress-strain (normalized by yield values) curves under uniaxial compression of plate with β = 3

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Fig. 6

Stress-strain (normalized by yield values) curves under uniaxial compression of plate with DOP 8.25%

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Fig. 7

Stress-strain (normalized by yield values) curves under uniaxial compression of plate with DOP 23.7%

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Fig. 8

Stress-strain (normalized by yield values) curves under uniaxial compression of plate with DOP 44.18%

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Fig. 9

Stress contour of plate (β = 3,DOP 3.66%, double)

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Fig. 10

Strain contour of plate (β = 3,DOP 3.66%, double)

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Fig. 11

Lateral deflection of plate (β = 3, DOP 3.66%, double)

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Fig. 12

Stress contour of plate (β = 3,DOP 3.66%, single)

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Fig. 13

Strain contour of plate (β = 3,DOP 3.66%, single)

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Fig. 14

Lateral deflection of plate (β = 3,DOP 3.66%, single)

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