CRACK PROPAGATION IN NOTCHED MILD STEEL PLATES SUBJECTED TO CYCLIC INELASTIC STRAINS

MILD STEEL (SAE 1015) PLATE SPECIMENS WITH CENTRAL CIRCULAR HOLES WERE USED TO STUDY CRACK PROPAGATION IN THE INELASTIC STRAIN REGION. THESE THIN PLATES WERE SUBJECTED TO COMPLETELY REVERSED CONSTANT AMPLITUDE CYCLIC STRAINS IN A SERVOCONTROLLED TESTING MACHINE. FATIGUE CRACK PROPAGATION RESULTS IN THE INELASTIC STRAIN REGION SHOWED THAT THE RATE OF CRACK GROWTH IS A POLYNOMIAL FUNCTION OF THE EQUIVALENT STRESS INTENSITY FACTOR DEVELOPED IN THIS WORK. THE RELATION IS SIMILAR TO THE EQUATION PROPOSED BY PARIS AND ERDOGAN FOR AN ELASTIC CASE AND DESCRIBES CRACK PROPAGATION RATES FOR BOTH ELASTIC AND INELASTIC STRAIN LEVELS. THE EQUIVALENT (OR MODIFIED) STRESS INTENSITY FACTOR INDIRECTLY REPRESENTS ACTUAL CRACK TIP STRESSES AND STRAINS AND REDUCES TO THE ELASTIC STRESS INTENSITY FACTOR. WITH THE AID OF THE RESULTS OF THE PRESENT STUDY, OTHER METHODS PROPOSED BY VARIOUS INVESTIGATORS FOR PREDICTING CRACK PROPAGATION RATES ARE ALSO DISCUSSED. /ASTM/

• Supplemental Notes:
  • Rept NO: ASTM 519
• Corporate Authors:

  Cyclic Stress-strain Behavior

  ,    
• Authors:
  • Gowda, C V
  • Topper, T H
• Publication Date: 1971-12

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 170-84
• Serial:
  • Publication of: Cyclic Stress-strain Behavior
  • Publisher: Cyclic Stress-strain Behavior

Subject/Index Terms

• TRT Terms: Cracking; Deformation curve; Elastoplasticity; Fracture mechanics; Steel plates; Testing equipment
• Uncontrolled Terms: Crack propagation; Elastic plastic analysis; Fracture
• Old TRIS Terms: Notch
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209937
• Record Type: Publication
• Report/Paper Numbers: S Tech Pub
• Files: TRIS
• Created Date: Oct 24 1973 12:00AM