A MECHANICAL MODEL FOR FATIGUE CRACK PROPAGATION

A MECHANICAL MODEL OF FATIGUE CRACK PROPAGATION IS PROPOSED. IT HYPOTHESIZES THAT DAMAGE DUE TO STRAIN CYCLING OF THE MATERIAL AT A CRACK TIP CAUSES PROPAGATION. MASON-COFFIN'S STRAIN CYCLE FATIGUE LAW WAS USED AS FAILURE CRITERION AND MINER'S LAW WAS USED FOR DAMAGE ACCUMULATION. THE PROPOSED THEORY CORRELATES SURPRISINGLY WELL WITH DATA FOR 2024-T351 A1 AND 4340 FULLY ANNEALED STEEL. STRAINS AT A CRACK TIP WERE MEASURED BY THE MOIRE OPTICAL INTERFERENCE METHOD. THE STRAIN AT A CRACK TIP WAS PROPORTIONAL TO DELTA K SQUARE. THE RESULTS OF STRAIN MEASUREMENTS WERE USED TO CALCULATE CRACK PROPAGATION RATE. /AUTHOR/

• Supplemental Notes:
  • PAPER 71
• Corporate Authors:

  CHAPMAN AND HALL

  LONDON,    
• Authors:
  • Liu, Han-Wen
  • Iino, N
• Publication Date: 1969-4

Media Info

• Features: Figures; References;
• Pagination: p. 812-23

Subject/Index Terms

• TRT Terms: Cracking; Failure; Fatigue (Mechanics); Mathematical models; Measurement; Mechanics; Optical measurement; Steel; Strain (Mechanics)
• Uncontrolled Terms: Crack propagation; Criteria; Models
• Old TRIS Terms: Strains
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209930
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 23 1974 12:00AM