MEASUREMENT OF MICROSCOPIC PLASTIC-STRAIN DISTRIBUTIONS IN THE REGION OF A CRACK TIP

TWO INDEPENDENT EXPERIMENTAL TECHNIQUES ARE USED TO MEASURE THE STRAIN DISTRIBUTION WITHIN THE PLASTICALLY DEFORMED REGION AROUND A CRACK TIP. MOIRE GRID INTERFERENCE IS USED TO MEASURE THE IN-PLANE STRAIN WITH THE SPECIMEN GRID ENGRAVED DIRECTLY ON THE SPECIMEN SURFACE. OPTICAL INTERFERENCE IS USED TO MEASURE THE THROUGH-THE-THICKNESS STRAIN OVER THE SAME ENGRAVED AREA. THE TESTING ARRANGEMENT ALLOWS MEASUREMENT OF AT-LOAD STRAIN AS WELL AS RESIDUAL STRAIN. THE MEASURED STRAIN DISTRIBUTION IS COMPARED WITH RECENT WORK BY SWEDLOW USING A FINITE-ELEMENT NUMERICAL TECHNIQUE AND WITH RESULTS OF THE ETCH-PIT TECHNIQUE USED BY HAHN AND ROSENFIELD. /AUTHOR/

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  • Supplemental Notes:
    • Vol 9, No 7, PP 296-304, 12 FIG, 1 TAB, 14 REF
  • Authors:
    • Underwood, J H
    • Kendall, D P
  • Publication Date: 1969-7

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  • Accession Number: 00209039
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 29 1994 12:00AM