PREDICTIONS OF CUMULATIVE FATIGUE DAMAGE USING CONDENSED LOAD HISTORIES

This paper presents predictions of fatigue crack initiation life for three distinctly different, irregular load histories, each applied to keyhole-notched compact tension specimens at several maximum load levels and using two different structural steels. Three computerized prediction methods (Landgraf, Wetzel, and a Nominal Stress Range approach) are used. All predictions are based on load histories condensed to 10% of their original number of reversals by the "Racetrack Method." This method, which is described in detail, selects the most damaging overall ranges in an irregular load history while preserving the sequence of the original loading. Predictions are compared with test data for the two dozen combinations of loading type and level and steel used. Comments are made on the relative merits of the different prediction methods.

• Supplemental Notes:
  • Prepared for SAE meeting Feb 24-28, 1974.
• Corporate Authors:

  Society of Automotive Engineers

  485 Lexington Avenue
  New York, NY  United States  10017
• Authors:
  • Nelson, D V
  • Fuchs, H O
• Publication Date: 1974-2

Media Info

• Pagination: 27 p.
• Serial:
  • Society of Automotive Engineers Preprint
  • Publisher: Society of Automotive Engineers (SAE)

Subject/Index Terms

• TRT Terms: Fracture mechanics; Mechanical engineering; Structural analysis; Structural design
• Uncontrolled Terms: Fatigue analysis
• Subject Areas: Design; Railroads;

Filing Info

• Accession Number: 00096606
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: N750045
• Files: TRIS
• Created Date: Jul 29 1975 12:00AM