BRITTLE FRACTURE INITIATION TESTS

A running crack will propagate at nominal stresses of 10,000 psi in steel plate. Nevertheless, structures of such steel operate at higher nominal stress. Furthermore, laboratory tests generally fail to initiate brittle fracture at nominal stresses below yield except by extreme cooling or impact loading. A strong barrier to the static initiation of brittle fracture thus exists. The object of the present investigation is to study the conditions under which this barrier is lowered. Until static laboratory tests reproduced fractures at the temperatures and nominal stresses encountered in service, brittle fracture will remain essentially unexplained. Moderate success has been achieved so far. Welded and unwelded notched steel plates with various prestrains were pulled at various temperatures. Transversely prestrained plates with punched notches fractured consistently below yield under static loading. The fractures were as brittle as those found in service in the region of propagation and, far more important, also at the point of initiation.

  • Corporate Authors:

    Brown University

    Providence, RI  United States  02912

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  United States  20418
  • Authors:
    • Mylonas, C
    • Drucker, D C
    • Isberg, L
  • Publication Date: 1958-10-15

Media Info

  • Features: References;
  • Pagination: 9 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00331904
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC-115 Prog Rpt.
  • Contract Numbers: NObs-65790, NObs-72046
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM