EMPIRICAL FORMULATIONS FOR THE ANALYSIS AND PREDICTION OF TRENDS FOR STEADY-STATE FATIGUE CRACK GROWTH RATES

The general characteristics of steady-state fatigue crack growth rates are discussed. An empirical formulation is described where two constants form a basic crack growth rate versus maximum stress intensity Kmax curve, which is a straight line on a log-log graph. The constants that form the base curves for various materials are correlated to Young's modulus. A third parameter that is sensitive to material alloy and environment is described and methods for obtaining this value are presented. Crack growth rate data for several stress ratios can then be projected to the basic modulus-dependent curve, where straight line scatter bands and statistical information pertaining to the overall accuracy of the formulations can be determined. /Author/

• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Fitzgerald, J H
• Publication Date: 1977-9

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 343-353
• Serial:
  • ASTM Journal of Testing and Evaluation
  • Volume: 5
  • Issue Number: 5
  • Publisher: Federal Highway Administration

Subject/Index Terms

• TRT Terms: Alloys; Fatigue (Mechanics); Forecasting; Fracture mechanics; Index tests; Modulus of elasticity; Statistics; Steady state
• Old TRIS Terms: Index properties
• Subject Areas: Data and Information Technology; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00165795
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 27 1977 12:00AM