FATIGUE BEHAVIOR OF WELDED BEAMS

THE FATIGUE BEHAVIOR OF WELDED STEEL BEAMS IS EVALUATED BY USING THE FRACTURE-MECHANICS CONCEPTS OF STABLE CRACK GROWTH. A FRACTURE-MECHANICS MODEL OF CRACKS ORIGINATING FROM THE PORES IN THE WEB-TO-FLANGE FILLET WELD IS DEVELOPED. ESTIMATES OF THE STRESS- INTENSITY FACTOR ARE MADE THAT NUMERICALLY DESCRIBE THE INITIAL FLAW CONDITION. WITH THE FINAL CRACK SIZE KNOWN, A THEORETICAL CRACK-GROWTH EQUATION WAS DERIVED FROM THE FATIGUE TEST DATA OF THE WELDED BEAMS. THE DERIVED RELATIONSHIP COMPARES WELL WITH ACTUAL CRACK-GROWTH MEASUREMENTS ON A WELDED BEAM AND AVAILABLE DATA FROM CRACK-GROWTH SPECIMENS. THE REGIME OF CRACK GROWTH, WHERE MOST OF THE TIME IS SPENT GROWING A FATIGUE CRACK IN A STRUCTURAL ELEMENT, IS SHOWN TO CORRESPOND TO GROWTH RATES BELOW ONE MILLIONTH OF AN INCH PER CYCLE. FEW EXPERIMENTAL CRACK-GROWTH DATA ARE AVAILABLE AT THIS LEVEL. IT IS CONCLUDED THAT THE FRACTURE-MECHANICS CONCEPTS CAN BE USED TO ANALYZE FATIGUE BEHAVIOR AND TO RATIONALLY EVALUATE THE MAJOR VARIABLES THAT INFLUENCE THE FATIGUE LIFE OF WELDED BEAMS. /AUTHOR/

Media Info

  • Features: Figures; References;
  • Pagination: p. 4-15
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00209766
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Apr 2 1973 12:00AM