An effective thickness proposal for strength evaluation of one-side pitted steel plates under uniaxial compression

Nouri, Zorareh Hadj Mohammad Esmaeil; Khedmati, Mohammad Reza; Sadeghifard, Shokoufeh

doi:10.1590/s1679-78252012000400004

Cited by 12 publications

(5 citation statements)

References 16 publications

(26 reference statements)

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“…With the use of the results of Khedmati et al (2011) andNouri et al (2012), the HULLST computer code is further enabled to consider the effects of various types of corrosion (uniform, random, pitting, and tanker pattern) when investigating the ultimate strength of ship hull girders. The procedure to obtain analytically the average stress-average strain relationships for uncorroded/ corroded steel plates under uniaxial compression is fully demonstrated by Khedmati and Nouri (2015).…”

Section: Article Highlightsmentioning

confidence: 99%

“…A series of validated nonlinear elastic-plastic finite element analyses on the plates in different uncorroded and pitted conditions, subjected to in-plane compression load, was later conducted by Nouri et al (2012). Full-range average stressaverage strain relationships of the plates were derived considering the changes in plate aspect ratio, plate slenderness or thickness, density of cone-type pitting, pit diameter, and ratio of pit diameter to the depth of the pits.…”

Section: Third Condition: Pitting Corrosionmentioning

confidence: 99%

“…The equivalent thickness formulation proposed by Nouri et al (2012) in the case of one-side pitting corrosion has the following form:…”

Section: Third Condition: Pitting Corrosionmentioning

confidence: 99%

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Progressive Collapse Analysis of an FPSO Vessel Hull Girder Under Vertical Bending Considering Different Corrosion Models

Nouri

Khedmati

2020

J. Marine. Sci. Appl.

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Nowadays, with the increasing operational life of ships, the aging effects on their structural behavior need to be investigated precisely. With the corrosive marine environment taken into consideration, one of the important effects of aging that must be studied is thickness degradation. In this paper, with the use of previously proposed equivalent thickness formulations for corroded plates, the progressive collapse analysis software HULLST is enhanced, and then, the effects of different corrosion models of uniform, random, pitting, and tanker pattern types on the ultimate and residual strengths of a floating production, storage, and offloading vessel hull girder are evaluated for the ages of 0 to 25 years. Results reveal that the uniform corrosion and random corrosion models have close outcomes. The value of relative reduction in the ultimate strength of ship hull girder (compared with the intact condition) ranges roughly from 6% for the age of 5 years to 17% for the age of 25 years in the hogging mode. The relative reduction in the ultimate strength ranges from 4% to 16% in the sagging mode. Pitting corrosion and tanker pattern (random) corrosion models lead to higher relative reductions in ultimate strength. The pitting corrosion model leads to a 16%–32% relative reduction in the ultimate strength for the ages of 5–25 years of the ship in either hogging or sagging. The tanker pattern (random) corrosion model leads to a 6%–37% relative reduction in the ultimate strength in the hogging mode and 3%–31% in the sagging mode at ship ages of 5 to 25 years.

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Section: Article Highlightsmentioning

confidence: 99%

Section: Third Condition: Pitting Corrosionmentioning

confidence: 99%

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Progressive Collapse Analysis of an FPSO Vessel Hull Girder Under Vertical Bending Considering Different Corrosion Models

Nouri

Khedmati

2020

J. Marine. Sci. Appl.

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“…For instance, Chatterjee et al (2011) investigated pitting corrosion effect on cantilever beam in case of breathing crack under harmonic loading by using modal analysis. Also, model of one side pitted steel plates under uniaxial compression has been done by Nouri et al (2012). In addition, analysis of the mechanical properties of corroded deformed steel bar was prepared by Gang et al (2010).…”

Section: Introductionmentioning

confidence: 99%

Pitting Corrosion Investigation of Cantilever Beams Using F.E. Method

Nagler¹

2012

AMS

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Carbon steel cantilever beams are widely used in many applications in aerospace, civil and mechanical engineering. Pitting corrosion is a phenomenon which places severe limitations on the design of such applications. As such, understanding this phenomenon and the methods to deal with it, are of a great importance. This paper presents numerical investigation by using F.E. (Finite Element) simulation on the load carrying capacity of corroded cantilever beams with pitting corrosion damage. The pitting corrosion hole shape has been modeled using ASTM G46 Standard Guide. Several different cases of pitting corrosion, represented by hemispherical holes, were modeled and examined by using ANSYS computer program. Simply supported edge constraint was used on one end, while the other end was free. In these F.E. models, element of Solid95 was used and comparison to Bernoulli-Euler theory was made. The effect of the radius of the pitting corrosion holes on the stresses in the beam was examined in compare to yield stress. It has been found that the M.S. (Margin of Safety) has been reduced gradually with increasing radii. Compatibility with Bernoulli-Euler theory has been achieved only for small radii. Moreover, three methods of pitting corrosion repairs were examined, together with Bernoulli-Euler theory comparison: (1) Regular surface repair (2) Extension surface repair and (3) "Handy Removal". It was found that extension surface repair has the highest M.S. value.

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“…More recently, several attempts have been performed to evaluate the ultimate strength of pitted platings by FE analysis and develop practical design formulas useful for the design of new vessels and the structural health assessment of aged ships (Khedmati et al 2012;Jiang and Guedes Soares 2012;Zhang et al 2017;Scamardella 2018 and2020). Following the main outcomes of past research activities (Nouri et al 2012;Khedmati et al 2012;Rahbar-Ranji et al 2015;Piscopo and Scamardella 2018), the ultimate strength of pitted platings mainly depends on the pitting ( DOP ) and corrosion ( DOC ) intensity degrees. The former is the percentage area of the plate panel affected by localised random corrosion, as it can be gathered by Figure 1, which provides the pitting intensity diagrams corresponding to 5%, 10%, 20% and 50% pitting intensity degrees…”

mentioning

confidence: 99%

Incidence of Pitting Corrosion Wastage on the Hull Girder Ultimate Strength

Piscopo

Scamardella

2021

J. Marine. Sci. Appl.

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The paper focuses on the assessment of the hull girder ultimate strength, combined with random pitting corrosion wastage, by the incremental-iterative method. After a brief review about the state of art, the local ultimate strength of pitted platings under uniaxial compression is preliminarily outlined and subsequently a closed-form design formula is endorsed in the Rule incremental-iterative method, to account for pitting corrosion wastage in the hull girder ultimate strength check. The ISSC bulk carrier is assumed as reference ship in a benchmark study, devoted to test the effectiveness of the incremental-iterative method, by a comparative analysis with a set of FE simulations, performed by Ansys Mechanical APDL. Four reference cases, with different locations of pitting corrosion wastage, are investigated focusing on nine combinations of pitting and corrosion intensity degrees. Finally, a comparative analysis between the hull girder ultimate strength, combined with pitting corrosion wastage, and the relevant values, complying with the Rule net scantling approach, is performed. Based on current results, the modified incremental-iterative method allows efficiently assessing the hull girder ultimate strength, combined with pitting corrosion wastage, so revealing useful both in the design process of new vessels and in the structural health monitoring of aged ships.

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An effective thickness proposal for strength evaluation of one-side pitted steel plates under uniaxial compression

Cited by 12 publications

References 16 publications

Progressive Collapse Analysis of an FPSO Vessel Hull Girder Under Vertical Bending Considering Different Corrosion Models

Progressive Collapse Analysis of an FPSO Vessel Hull Girder Under Vertical Bending Considering Different Corrosion Models

Pitting Corrosion Investigation of Cantilever Beams Using F.E. Method

Incidence of Pitting Corrosion Wastage on the Hull Girder Ultimate Strength

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