Comparative study between analytical and FE analysis for the ultimate strength assessment of pitted platings

Abstract

The ultimate strength assessment of platings affected by pitting corrosion wastage is a basic issue for the scantling and design of ship structures. In the past, several nonlinear FE analyses were performed to investigate the incidence of pitting degree and corrosion depth on the ultimate strength of plate panels, with the main aim of providing some approximate formulations, useful at least in the preliminary project phase. Based on actual state of art, the main aim of current research is to provide an analytical formulation for the ultimate strength assessment of platings with random pitting corrosion wastage, by solving the Marguerre non-linear governing differential equations for large deflection analysis of platings in the post-buckling regime. In this respect, a comparative analysis between the analytical solution and a series of FE results is preliminarily performed for uncorroded platings, combining different levels of initial geometrical imperfections and welding residual stresses. Subsequently, the comparative analysis is extended to platings affected by pitting corrosion wastage. Hence, different levels of pitting and corrosion intensity degrees are properly combined in order to investigate the goodness of the proposed analytical formulation.

Keywords

Plating ultimate strength Marguerre equations pitting corrosion wastage FE analysis

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References

Campanile,

Piscopo and

Scamardella, Statistical properties of bulk carrier longitudinal strength, Marine Structures39 (2014), 438–462. doi:10.1016/j.marstruc.2014.10.007.

Campanile,

Piscopo and

Scamardella, Incidence of residual stresses and steel property variability on corroded bulk carrier reliability, Ocean Engineering128 (2016), 58–80. doi:10.1016/j.oceaneng.2016.10.026.

Campanile,

Piscopo and

Scamardella, Time-variant bulk carrier reliability analysis in pure bending intact and damage conditions, Marine Structures46 (2016), 193–228. doi:10.1016/j.marstruc.2016.02.003.

Cui,

Wang and

P.T.

Pedersen, Strength of ship plates under combined loading, Marine Structures15 (2002), 75–97. doi:10.1016/S0951-8339(01)00009-0.

Jiang and

Guedes Soares, Ultimate capacity of rectangular plates with partial depth pits under uniaxial loads, Marine Structures26 (2012), 27–41. doi:10.1016/j.marstruc.2011.12.005.

M.R.

Khedmati,

Z.H.M.

Nouri and

M.M.

Roshanal, A comparative computational investigation on the effects of randomly distributed general corrosion on the post-buckling behaviour of uniaxially loaded plates, Journal of Mechanical Science and Technology26(3) (2012), 767–783. doi:10.1007/s12206-011-1222-1.

J.K.

Paik and

A.K.

Thayamballi, Ultimate Limit State Design of Steel-Plated Structures, Wiley, Chichester, UK, 2006.

J.K.

Paik,

A.K.

Thayamballi and

J.M.

Lee, An empirical formulation for predicting the ultimate compressive strength of stiffened panels, in: Proceedings of the 7th International Offshore and Polar Engineering Conference, Honolulu, USA, 1997.

J.K.

Paik,

A.K.

Thayamballi and

J.M.

Lee, Effect of initial deflection shape on the ultimate strength behaviour of welded steel plates under biaxial compressive loads, Journal of Ship Research48(1) (2004), 45–60.

10.

J.K.

Paik,

Wang,

A.K.

Thayamballi,

J.M.

Lee and

Park, Time-dependent risk assessment of ageing ships accounting for general/pit corrosion, fatigue cracking and local dent damage, in: Proceedings of the Annual SNAME Meeting, San Francisco, USA, 2003.

11.

Piscopo, Buckling analysis of rectangular plates under the combined action of shear and uniaxial stresses, World Academy of Science, Engineering and Technology46 (2010), 546–553.

12.

Piscopo, Refined buckling analysis of rectangular plates under uniaxial and biaxial compression, World Academy of Science, Engineering and Technology46 (2010), 554–561.

13.

Piscopo and

Scamardella, Towards a unified formulation for the ultimate strength assessment of uncorroded and pitted platings under uniaxial compression, Ocean Engineering169 (2018), 70–86. doi:10.1016/j.oceaneng.2018.08.042.

14.

C.S.

Smith,

P.C.

Davidson,

J.C.

Chapman and

P.J.

Dowling, Strength and stiffness of ships’ plating under in-plane compression and tension, RINA Transactions130 (1988), 277–296.

15.

Zhang,

Huang and

Meng, Ultimate strength of hull structural stiffened plate with pitting corrosion damage under uniaxial compression, Marine Structures56 (2017), 117–136. doi:10.1016/j.marstruc.2017.07.006.