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The fatigue load spectrum to be applied to the 30-m aluminum ship-evaluation model (ASEM) is presented. The ASEM will be tested in the David W. Taylor Naval Ship Research and Development Center, Carderock, Maryland. Spectra developed for design, analysis, and test purposes are given, based on a reference lifetime-load spectrum developed for a 90-m aluminum ship. Selected ship trial results that provide the basis for developing the lifetime-load spectrum for the 90-m ship are also presented. Results of sensitivity studies of fatigue crack growth indicate that a repeatable 1/100-year block spectrum, sequenced in a low-to-high-to-low order is a practicable compromise for fatigue testing ASEM.
ship lifetime-loads, fatigue testing, test spectra, crack growth, aluminum ships, ship model testing
Project engineer, Science Engineering Analysis Co., Bethesda, Md.
Structural engineer, David W. Taylor Naval Ship Research and Development Center, Bethesda, Md.
Senior aerospace engineer, Naval Air Development Center, Warminster, Pa.
Senior project engineer, David W. Taylor Naval Ship Research and Development Center, Bethesda, Md.