CRACK GROWTH RESISTANCE CURVES (R-CURVES)-LITERATURE REVIEW

A MODIFICATION OF THE TAPERED DOUBLE CANTILEVER BEAM SPECIMEN FOR MEASURING KR-CURVES OF THIN SHEETS IS DE- SCRIBED. THE MODIFICATION CONSISTS OF ADHERING PROPERLY CON- TOURED COVER PLATES TO THE SHEET TO FORM A COMPOSITE ZERO K-GRADIENT (ZKG) SPECIMEN. THIS TESTING PROCEDURE HAS A NUMBER OF ADVANTAGES OVER THOSE PRESENTLY USED FOR PLANE STRESS TESTING: 1. K IS PROPORTIONAL TO THE APPLIED LOAD AND INDEPENDENT OF CRACK LENGTH. CONSEQUENTLY, THE SPECIMEN IS STABLE, ALLOWING FOR THE COLLECTION OF THE COMPLETE KR-CURVE. 2. THE TESTING PROCEDURE IS SIMPLIFIED, AND THE INSTRUMENTATION REQUIRED TO COLLECT DATA, EVEN AT HIGH RATES, IS RELATIVELY SIMPLE, SINCE ONLY LOAD NEED BE MON- ITORED. 3. BUCKLING IS ELIMINATED WITHOUT THE NEED OF CON- STRAINING MEMBERS NEAR THE CRACK. 4. CRACKING RATE IS RELAT- ED LINEARLY TO DISPLACEMENT RATE. /ASTM/

  • Supplemental Notes:
    • Rept No ASTM 527
  • Authors:
    • Heyer, R H
  • Publication Date: 1973-4

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Filing Info

  • Accession Number: 00209954
  • Record Type: Publication
  • Report/Paper Numbers: S Tech Pub
  • Files: TRIS
  • Created Date: Dec 22 1973 12:00AM