Accession Number : ADA137954

Title :   Study of the Effects of Metallurgical Factors on the Growth of Fatigue Microcracks.

Descriptive Note : Final rept. 1 Nov 80-31 Oct 83,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s) : Lankford,J

PDF Url : ADA137954

Report Date : Jan 1984

Pagination or Media Count : 11

Abstract : The micromechanics of crack tip yielding are characterized for large and small fatigue cracks in aluminum alloys. Techniques used included selected area electron channeling and stereoimaging strain analysis. The anomalous fast growth of small fatigue cracks correlated with greater crack tip strains and displacements, and lower crack opening loads, for microcracks as compared with large cracks. Microcrack growth rate perturbations were modeled in terms of grain boundary induced reductions in crack tip strain. (Author)

Descriptors :   *Microcracking, *Aluminum alloys, Crack propagation, Fatigue(Mechanics), Strain(Mechanics), Deformation, Microstructure, Behavior, Cracking(Fracturing), Stress strain relations, Loads(Forces)

Subject Categories : Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE