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EVALUATION OF RESIDUAL STRENGTH OF CORRODED STRUCTURAL STEEL PLATES AND STIFFENED PANELS

Bajaj, Srikanth
http://rave.ohiolink.edu/etdc/view?acc_num=akron1543570329693244

Abstract Details

2018, Doctor of Philosophy, University of Akron, Civil Engineering.
Corrosion is a process that occurs naturally under aggressive environmental conditions, and it causes deterioration of metals over an extended period of exposure time. A number of factors contribute to corrosion of metals, some of which can be controlled and others that cannot. Structures on oceangoing vessels are primarily constructed from steel plates, which are combined to form stiffened panels. These structural elements are highly susceptible to different types of corrosion, depending on the environment condition surrounding the steel members. Uniform corrosion (or general corrosion) and non-uniform corrosion (such as pitting corrosion, edge corrosion and groove corrosion) are the most common types of corrosion affecting structural elements such as decks, hulls, and other parts of ships. In many industries, it is common to assess the corrosion damage of structural components primarily based on visual inspection with limited or no structural stress analysis. Premature replacement of such components can prove expensive over time, while delaying the replacement of these components might become a safety issue. In order to assess the level of safety, the remaining life of the corroding structure needs to be predicted using structural and/or stress analysis. The overall goal in assessing the remaining life is to relate the loss of thickness in the system to the performance of the individual structural elements in order to achieve a better prediction. The objective of the project described in this dissertation was to develop a method to predict the remaining strength of stiffened panels exposed to different form of corrosion that are subjected to different loading conditions to simulate practical conditions in the operation of a ship. Experimental work was carried out on stiffened panels subject to different types and levels of corrosion. Finite Element Analysis (FEA) using the commercial software Abaqus was used to capture varying degrees of corrosion and the effects of the degree of corrosion on the residual strength. Stiffened panel test specimens were designed using the guidelines related to typical marine structures recommended by the International Association of Classification Societies (IACS) and the American Bureau of Shipping (ABS) guidelines. The fabricated panels were subjected to a corrosive environment by using either an electrochemical process based on Faraday’s Law or a Q-FOG cyclic corrosion chamber based on ASTM B117 to induce the desired level of corrosion. The corroded stiffened panel test specimens were analyzed with a combination of in-plane compression and simulated hydraulic lateral pressure using a test setup designed and fabricated at The University of Akron. The FEA model and the experimental stiffened panel test results along with the relation of the ultimate capacity of the stiffened panel with respect to corrosion type and corrosion level are presented. In addition, the research project considers in detail the effect of initial imperfection, residual stress, boundary conditions, and different geometric properties on the ultimate capacity of the stiffened panel.
Anil Patnaik, Dr. (Advisor)
Craig Menzemer, Dr. (Committee Member)
David Roke, Dr. (Committee Member)
Xiaosheng Gao, Dr. (Committee Member)
Nao Mimoto, Dr. (Committee Member)
224 p.
Civil Engineering
stiffened plates; uniform corrosion; non-uniform corrosion; in-plane loading, out-of-plane loading; finite element model

Recommended Citations

Citations

  • Bajaj, S. (2018). EVALUATION OF RESIDUAL STRENGTH OF CORRODED STRUCTURAL STEEL PLATES AND STIFFENED PANELS [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1543570329693244

    APA Style (7th edition)

  • Bajaj, Srikanth. EVALUATION OF RESIDUAL STRENGTH OF CORRODED STRUCTURAL STEEL PLATES AND STIFFENED PANELS. 2018. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1543570329693244.

    MLA Style (8th edition)

  • Bajaj, Srikanth. "EVALUATION OF RESIDUAL STRENGTH OF CORRODED STRUCTURAL STEEL PLATES AND STIFFENED PANELS." Doctoral dissertation, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1543570329693244

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.