Accession Number : AD0784915

Title :   Determination of Stage 1 and Stage 11 Crack Propagation Periods in Fatigue-an Indirect Approach.

Descriptive Note : Interim rept.,


Personal Author(s) : Jhansale,H. R. ; Gowda,C. V. B.

Report Date : 1974

Pagination or Media Count : 41

Abstract : Fatigue crack initiation (Stage 1) and Fatigue crack propagation (Stage 11) periods in a given fatigue life can be determined by an indirect testing method. This method is based on a series of two level strain tests in which each axial specimen is strain cycled at an initial high strain amplitude for a specified number of cycles followed by low strain amplitude cycling to failure. The resulting behavior termed 'Initially Overstrained Long Life Behaviour', can be analysed to estimate the durations of Stage 1 and Stage 11 crack growth periods. A preliminary study of surface damage associated with this overstrained long life behaviour is also included. (Author)

Descriptors :   *Fatigue(Mechanics), *Crack propagation, Test methods, Strain(Mechanics), Surfaces, Canada

Subject Categories : Metallurgy and Metallography
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE