Abstract
Abstract Spectrum FCG data were generated with corner cracks at center holes for three contrasting spectrum types and two aluminum alloys, 2124-T851 and 7475-T7351. Existing strip-yield crack closure models for FCG analysis under spectrum loading were evaluated in comparison to conventional FCG models and enhanced as needed. Spectrum editing methods based on closure behavior were developed to reduce both computational and experimental time. FASTRAN was modified to address apparent differences in closure behavior between the surface and bore tips for compression-dominated spectra. Strip yield models successfully predicted FCG lives for contrasting spectra with a common constraint factor, unlike conventional models.
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