FATIGUE AND FRACTURE OF A BITUMINOUS PAVING MIXTURE

THE FATIGUE BEHAVIOR OF SIMPLY SUPPORTED SAND-ASPHALT BEAMS IS EXAMINED BY USING EXPERIMENTAL AND ANALYTICAL METHODS OF FRACTURE MECHANICS. THE FATIGUE CRACK GROWTH RATES CORRELATE WELL WITH THE STRESS-INTENSITY FACTOR IN ACCORDANCE WITH PARIS'S LAW THAT STATES THE DC/DN = AK, TO THE FOURTH POWER WHERE DC/DN IS THE CRACK PER CYCLE, A IS A CONSTANT OF A MATERIAL, AND K IS THE STRESS-INTENSITY FACTOR, WHICH IS DEPENDENT ON THE LOAD, GEOMETRY, AND BOUNDARY CONDITIONS. IT IS POSTULATED THAT IN A MATERIAL SUCH AS A SAND-ASPHALT MIXTURE, WHICH IS ABUNDANTLY ENDOWED WITH FLAWS, FATIGUE DAMAGE IS INITIATED AT THE FIRST LOADING CYCLE, SO THAT THE FATIGUE LIFE IS THE NUMBER OF CYCLES OF REPEATED LOADING TO PROPAGATE A "STARTER FLAW," INTO A CRACK OF CRITICAL SIZE. THE STARTER FLAW IS A MATERIAL'S CONSTANT BUT IS SUBJECT TO STATISTICAL VARIATION AND IS BELIEVED TO BE PRINCIPALLY RESPONSIBLE FOR THE STATISTICAL VARIATION OF FATIGUE LIFE. THE CRACK REACHES THE CRITICAL STRESS-INTENSITY FACTOR, WICH IS A CONSTANT FOR A GIVEN MATERIAL. THE CRITICAL STRESS-INTENSITY FACTOR IS THE FAILURE CRITERION FOR BOTH STATIC FRACTURE AND FATIGUE. A FORMULA FOR FATIGUE LIFE IS GIVEN. METHODS FOR DETERMINING THESE CONSTANTS ARE PRESENTED, AND THE FATIGUE LIVES, DETERMINED EXPERIMENTALLY, ARE COMPARED WITH THOSE PREDICTED FROM THE FORMULA AND SHOW GOOD AGREEMENT. /AUTHOR/

  • Digital Copy:
  • Supplemental Notes:
    • Paper sponsored by Committee on Mechanical Properties of Bituminous Paving Mixtures and presented at the 49th Annual Meeting.
  • Authors:
    • Majidzadeh, Kamran
    • Chan, A T
    • Ramsamooj, D V
  • Publication Date: 1970

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 44-54
  • Monograph Title: Bituminous materials, mixes and compaction
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211562
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Oct 26 1970 12:00AM