Dr. John C. Daidola and RADM David P. Sargent present the "Jimmie" Hamilton Award to:
Dr. Ayyub
Dr. Koko

THE AMERICAN SOCIETY
OF NAVAL ENGINEERS

takes great pleasure in presenting

The "Jimmie" Hamilton Award
for the year 2003 to

Dr. Unyime O. Akpan, Dr. Tamunoiyala S. Koko,
Dr. Bilal M. Ayyub, and Timothy E. Dunbar

For the best original paper published in the Naval Engineers Journal
during the year 2003 as set forth in the following

CITATION:

The paper "Reliability Assessment of Corroding Ship Hull Structure" was published in the Naval Engineers Journal, Fall 2003 edition. The authors have developed an approach for time-dependent reliability assessment of the ultimate strength of a ship hull structure in the presence of corrosion. By modeling corrosion growth as a time-dependent random function and using the second order reliability method to calculate the instantaneous reliability of the primary hull structure, they demonstrated that the proposed time-dependent reliability is always lower than the instantaneous reliability and more sensitive to the statistical value of the corrosion parameters than their probabilistic distribution descriptions. Time-dependent reliability results provide the basis for computing hazard functions and subsequent decisions relating to life expectancy analysis and extension.

The authors have demonstrated the proposed method using a typical cross section of a tanker including parametric analysis.

This paper captures the essence of time-dependent reliability-based analysis of ship structures subject to corrosion, and provides a basis for including corrosion in reliability studies in order to obtain realistic estimates. It is definitely in keeping with the technical standards of the Naval Engineers Journal. The authors are most deserving of the Society's 2003 "Jimmie" Hamilton Award.

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