FATIGUE OF PERIODICALLY OVERLOADED STIFFENER DETAIL

The effect of periodic overloads on enhancement or delay of fatigue crack initiation and propagation at a transverse stiffener detail is investigated. A total of 73 specimens fabricated from A588 steel were tested. The overloading conditions were: (1) No overloads; (2) one overload applied at the beginning; and (3)six cases in which overloads were applied every 10 to the sixth to 10 constant amplitude cycles. The ratio of overload to the loads applied during constant cycling was 1.67. Overloads applied every 10 cubed cycles or farther apart extended life with the longest delay occuring at a spacing of about 10 to the cycles. The transition from delay to enhancement of fatigue cracking occurred at 10 fifth squared cycles. Reasons for delay effects on fatigue crack initiation and propagation are presented. /Author/

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Abtahi, A
  • Albrecht, P
  • Irwin, G R
• Publication Date: 1976-11

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 2103-19
• Serial:
  • Journal of the Structural Division
  • Volume: 102
  • Issue Number: ST11
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Cracking; Fatigue (Physiological condition); Oversize loads; Repeated loads; Steel; Stiffeners (Plates)
• Uncontrolled Terms: Overloads
• Old TRIS Terms: Stiffeners
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00148374
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 15 1977 12:00AM