The Dynamic Tear (DT) test was developed for characterization of the fracture-resistance properties of metals over the entire range of strength and toughness. The fracture-extension-resistance curve (R curve), which is determined by DT test procedures, indicates the fracture state (elastic or plastic) and the level of resistance to crack extension in terms of the required energy per unit extension. R curves were determined for 4 aluminum alloys in 3-in. thicknesses. These materials have been tested by standard fracture-mechanics procedures. R curves for full thickness and for 1-in. and 0.625-in. section sizes are compared to results of K (Ic) tests. The R-curve data are also presented in terms of an equation involving specimen cross-section dimensions and a constant which is related to the R-curve slope. (Author)

  • Supplemental Notes:
    • Final report on Phase 1.
  • Corporate Authors:

    Naval Research Laboratory

    Stennis Space Center, MS  United States  39529-5004
  • Authors:
    • Judy Jr, R W
    • Goode, R J
  • Publication Date: 1973-1-29

Media Info

  • Pagination: 18 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00044645
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NRL-7538
  • Files: TRIS
  • Created Date: Sep 4 1973 12:00AM