EXPERIMENTAL OBSERVATION OF A STRESS INTENSITY HISTORY EFFECT UPON FATIGUE CRACK GROWTH RATE

Experimental results illustrate a previously unreported stress intensity history effect following a step increase in stress intensity. Data for 12 of 24 cases of step increases in stress intensity are presented which show an initially enhanced crack growth rate of two to four times the steady state growth rate. The effect diminishes until the normal rate is reached after 0.025 to 0.150 inch of crack extension and 200 to 600 cycles. An associated study of the causes of this behavior is being undertaken.

• Corporate Authors:

  Army Materials and Mechanics Research Center

  Watertown, MA  United States  02172
• Authors:
  • Matthews, W T
  • Baratta, F
  • Driscoll, G
• Publication Date: 1971-9

Media Info

• Features: References;
• Pagination: 8 p.

Subject/Index Terms

• TRT Terms: Cracking; Fatigue cracking; Fatigue tests; Stresses
• Uncontrolled Terms: Crack propagation; Stress intensity factors
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00035605
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: AMMRC TR 71-3 8Tech Rp
• Files: TRIS
• Created Date: Oct 27 1972 12:00AM