CUMULATIVE FATIGUE DAMAGE UNDER COMPLEX STRAIN HISTORIES

THE ACCUMULATION OF FATIGUE DAMAGE UNDER COMPLEX MECHANICAL HISTORIES IS APPROACHED FROM A CYCLIC DEFORMATION VIEWPOINT. SMOOTH AXIAL SPECIMENS OF SAE 1045 STEEL IN TWO HEAT TREATED CONDITIONS WERE SUBJECTED TO REPEATED BLOCKS OF A VARIETY OF COMPLEX STRAIN HISTORIES AND THE RESULTING STRESS-STRAIN RESPONSES DETERMINED. A NEW DAMAGE EQUATION, BASED ON SIMPLE MATERIALS PROPERTIES, WAS THEN APPLIED TO STABILIZED BLOCKS AND A FATIGUE LIFE PREDICTED. THE METHOD ENTAILS A REVERSAL-BY-REVERSAL STRESS-STRAIN ANALYSIS OF A HISTORY USING THE RATIO OF PLASTIC TO ELASTIC STRAIN RANGE AS A DAMAGE PARAMETER. A COMPUTER PROGRAM WAS DEVELOPED TO PERFORM THE DETAILED DATA REDUCTION AND ANALYSIS AND CAN BE EMPLOYED ON-LINE IN A COMPUTER INTERFACED, CLOSED LOOP TEST SYSTEM. AGREEMENT BETWEEN EXPERIMENTAL AND PREDICTED LIVES IS WITHIN A FACTOR OF TWO OVER THE RANGE OF LIVES INVESTIGATED. /ASTM/

• Supplemental Notes:
  • ASTM 519 APPS
• Corporate Authors:

  Cyclic Stress-strain Behavior

  ,    
• Authors:
  • Landgraf, R W
• Publication Date: 1971-12

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 213-28
• Serial:
  • Publication of: Cyclic Stress-strain Behavior
  • Publisher: Cyclic Stress-strain Behavior

Subject/Index Terms

• TRT Terms: Computer programs; Deformation curve; Easements; Elastoplasticity; Fatigue tests; Loss and damage; Planting; Steel
• Uncontrolled Terms: Elastic plastic analysis
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00209938
• Record Type: Publication
• Report/Paper Numbers: S Tech Pub
• Files: TRIS
• Created Date: Oct 24 1973 12:00AM