FATIGUE CRACK GROWTH RETARDATION UNDER CONSTANT AMPLITUDE AND VARIABLE MEAN STRESS

Fatigue crack growth retardation under stress spectra with constant amplitude and variable mean stress, respectively, was studied. Flat specimens with a central through crack were tested under tension-tension load. The specimens were made with low alloy steel 4 mm thick, with yield strength of 625 mpa and ultimate tensile strength of 784 mpa. Overload affected crack length increments were studied. Forman's equation and Willenborg's model of fatigue crack growth retardation were used for theoretical prediction of fatigue crack propagation life. The results suggest that fatigue crack growth retardation strongly depends on the difference between successive stress levels. The higher the preceding stress level, the larger the fatigue crack growth retardation. Two parameters are especially affected by the overload: the lowest fatigue crack growth rate following the overload; and the overload-affected zone size. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01421123
• Corporate Authors:

  IPC Science and Technology Press Limited

  IPC House, 32 High Street
  Guildford, Surrey  England 
• Authors:
  • Glinka, S
  • Molski, K
• Publication Date: 1980-7

Media Info

• Features: Figures; References;
• Pagination: p. 105-111
• Serial:
  • International Journal of Fatigue
  • Volume: 2
  • Issue Number: 3
  • Publisher: Butterworth Scientific Limited
  • ISSN: 0142-1123

Subject/Index Terms

• TRT Terms: Alloy steel; Cracking; Fatigue (Mechanics); Mathematical models; Oversize loads; Steel; Stresses; Tests
• Uncontrolled Terms: Crack propagation; Decreases; Overloads
• Old TRIS Terms: Retarding
• ITRD Terms: 5211: Cracking; 9009: Decrease; 5579: Fatigue (mater); 6473: Mathematical model; 4542: Steel; 5575: Stress (in material); 6255: Test
• Subject Areas: Geotechnology; Highways; Materials; I34: Steels and Metals;

Filing Info

• Accession Number: 00324670
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Sep 16 1981 12:00AM