AN ANALYSIS OF THE INFLUENCE OF MEAN STRESS INTENSITY AND ENVIRONMENT ON FATIGUE CRACK GROWTH IN A NEW HIGH STRENGTH ALUMINUM ALLOY

The effects of the mean stress intensity factor K sub m and the range of the stress intensity delta K on fatigue crack propagation during wholly tensile loading cycles in the aluminum (Al) alloy RR58 in laboratory air and in a 3.5% NaCl solution have been studied using contoured double-cantilever beam specimens. In general the fatigue crack growth rate in NaCl solution was greater than in air under similar conditions except for tests in which high values of the maximum stress intensity factor were used when no significant difference was observed. Based on the experimental data a relation between the cyclic crack growth rate da/dN and the tensile loading levels has been proposed. The threshold value of delta K, delta K sub th, is approximately 12% higher in air than in the 3.5% NaCl solution, and its value decreases linearly with increasing values of K sub m. /Author/

  • Corporate Authors:

    American Society for Testing and Materials

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  USA  19428-2957
  • Authors:
    • Branco, C M
    • Radon, J C
    • Culver, L E
  • Publication Date: 1975-11

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00129374
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 10 1976 12:00AM