A preliminary study of energy release rates in simple structures has been made. These simple structures consisted of 75ST specimens 6-in. wide, 12-in. long, and .032-in. thick. The specimens contained holes of various geometric shapes: circles, ellipses, squares, and slots. Symmetrical slots which serve as crack simulators of increasing length were introduced at the extremities of the holes. Energy release rates of the specimens with slots up to 2/3 the plate width were measured and compared with rates for a plate containing a simple slot alone. The energy release rates for the plates containing a hole-slot combination were quite similar to the rates for plates containing simple slots. Thus the instability stress for a plate containing a hole from which a crack has started should be approximately equal to the instability stress for a plate containing a crack of length equal to the hole-crack combination. Comparisons of test results with theoretical values show good agreement with a function of the Griffith type for the full range of slot lengths evaluated. Agreement of test results with the modified Greenspan relation was satisfactory up to ratios of slot width to plate width of 1/4. Beyond this range the experimental rate was considerabley less than the calculated rate.

  • Corporate Authors:

    Naval Research Laboratory

    4555 Overlook Avenue, SW
    Washington, DC  United States  20375-5320

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  United States  20418
  • Authors:
    • Brossman, M W
    • Kies, J A
  • Publication Date: 1955-4-22

Media Info

  • Features: References;
  • Pagination: 21 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00331300
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC- 98
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM