Study of statistical variations of load spectra and material properties on aircraft fatigue life
Walter, Richard W.
Lindsey, Gerald H.
Wu, Edward M.
MetadataShow full item record
NAVAIR utilizes the fatigue spectrum of an existing Navy aircraft to set the structural design requirements for a new Navy aircraft. The current design requirement is for the new aircraft to withstand a fatigue spectrum at least as severe as the spectrum experienced by 99.73% (3 standard deviations) of the aircraft from which the design requirement originated. Two years of A-6 data were used in the study, which contained the number of g exceedences at the four g, five g, six g, and seven g levels. Trade off studies were completed to analytically examine the variation in the fatigue life of an aircraft while varying the reference stress at the notch of a crack, re-ordering of the load sequences within the spectrum, varying the 3 sigma design requirement, and changing the material properties of the metal. The results indicated that NAVAIR's current requirement for a new aircraft to withstand a three a spectrum may be too severe. This conclusion is only valid for a three a spectrum based on the A-6 load history.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Duym, Wade Douglas (Monterey, California. Naval Postgraduate School, 1995-06);Many modern tactical aircraft incorporate digital avionics systems with federated, centralized or distributed avionics architectures that share data via interconnecting data buses. The design of a digital avionics architecture ...
Stewart, John E. C. (Monterey, California. Naval Postgraduate School, 1995-03);The requirement exists at the Naval Postgraduate School Unmanned Air Vehicle Laboratory for an air vehicle capable of carrying a 60 pound payload. To that end, an air vehicle from the canceled Army Aquila program was ...
Roberts, Donald A. (Monterey, California. Naval Postgraduate School, 2012-03);In recent years optimal manning has been implemented on U.S. Navy surface ships where crew sizes have been reduced. This undermanning has resulted in a requirement for sailors to stand longer watches and get less sleep, ...