ANALYSIS OF FATIGUE AND FRACTURE OF BITUMINOUS PAVING MIXTURES - FINAL REPORT, PHASE I

IT IS POSTULATED THAT IN MATERIALS SUCH AS ASPHALTIC CONCRETE AND SAND ASPHALT MIXTURES WHICH ARE 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 MATERIALS CONSTANT, BUT IS SUBJECT TO STATISTICAL VARIATION AND IS BELIEVED TO BE PRINCIPALLY RESPONSIBLE FOR THE STATISTICAL VARIATION OF FATIGUE LIFE. THE FATIGUE BEHAVIOR OF SIMPLY SUPPORTED ASPHALT BEAMS AND BEAMS ON ELASTIC FOUNDATION ARE EXAMINED USING EXPERIMENTAL AND ANALYTICAL METHODS OF FRACTURE MECHANICS. THE FATIGUE CRACK GROWTH RATES CORRELATE WELL WITH THE STRESS-INTENSITY FACTOR, IN ACCORDANCE WITH PARIS' LAW, WICH STATES THAT DC/DN = AK"N" WHERE DC/DN IS THE CRACK GROWTH PER CYCLE, A IS A MATERIALS CONSTANT, AND K IS THE STRESS-INTENSITY FACTOR WHICH IS DEPENDENT ON THE LOAD, GEOMETRY, AND BOUNDARY CONDITIONS. IN THIS REPORT, THE CRACK GROWTH LAW FOR TWO MIXTURES, THREE TEMPERATURES, FOUR BEAM GEOMETRIES AND TWO MODES OF LOADING ARE PRESENTED. IT IS SHOWN THAT FOR BEAM ON ELASTIC FOUNDATION AND FOR SIMPLY SUPPORTED BEAMS TESTED AT LOW TEMPERATURES, THE CONSTANT "N" IN THE CRACK GROWTH LAW IS ALMOST EQUAL TO FOUR, WHICH IS THE VALUE PREDICTED BY PARIS' ANALYSIS. HOWEVER, AT HIGHER TEST TEMPERATURES, THE CONSTANT "N" FOR SIMPLY SUPPORTED BEAMS IS SMALLER THAN THE THEORETICAL VALUE. THIS IS ATTRIBUTED TO INTERACTION OF CREEP AND FATIGUE PHENOMENA. THE METHODS OF DETERMINING THE CONSTANTS ARE PRESENTED, AND THE FATIGUE LIVES ARE COMPARED WITH THE PREDICTED ONES. /AUTHOR/

  • Corporate Authors:

    Ohio Department of Highways

    Columbus, OH  United States  43210

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Majidzadeh, K
    • Kauffmann, E M
    • Ramsamooj, D V
    • Chan, A T
  • Publication Date: 0

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00210461
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Fh-11-7257
  • Files: TRIS, USDOT
  • Created Date: Aug 8 1971 12:00AM