Accession Number : AD0770980

Title :   Fatigue Crack Growth in Ti-6Al-4V from Threshold to Unstable Fracture,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Amateau,Maurice F. ; Hanna,William D. ; Kendall,E. George

Report Date : 30 NOV 1973

Pagination or Media Count : 80

Abstract : The fatigue crack growth of Ti-6Al-4V in the diffusion bond annealed condition was examined in the range of growth rates from 10 to the minus 12th power to 10 to the minus 4th power m/cycle with the use of compact tension and part-through-crack specimens. The effects of cyclic frequency and maximum stress were investigated. Fractured surfaces were examined by scanning electron microscopy over the entire range of crack growth. The fatigue data were fit empirically to a number of crack propagation laws, none of which was able to predict the entire range of crack growth from threshold to unstable fracture. When the fatigue crack growth rates were compared with those of Ti-6Al-4V of other microstructures, it was found that the diffusion bond annealed was among the most fatigue crack resistant of any microstructure examined. (Author)

Descriptors :   *Titanium alloys, *Fatigue(Mechanics), Crack propagation, Aluminum alloys, Vanadium alloys, Bonding, Annealing, Stresses, Numerical analysis, Microstructure

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE