EXHAUSTION OF DUCTILITY IN COMPRESSED BARS WITH HOLES

The brittleness of mild steel subjected to tension after prior compressive prestraining has been in part attributed to the collapse of microscopic flaws or voids and to the resulting severe straining, work hardening, and sharpening of the flaw edges. A similar mechanism of embrittlement should operate also with artificial macroscopic flaws as holes. This was checked with tests of axially com- pressed bars of ABS-B and of E-steel with transverse pre- or post-drilled single or double holes. The overall nominal compressive prestrain (exhaustion limit) causing brittleness in subsequent tension in bars with pre-drilled holes was about 1/4 the corresponding prestrain for solid bars of E-steel and about 1/2 for ABS-B steel. The possible causes of this difference and the modes of fracture initiation and propagation are discussed. The strong differentiation of steel quality achieved with these tests is very promising for the development of a related acceptance test.

  • Availability:
  • Supplemental Notes:
    • Project name is Macrofracture Fundamentals
  • Corporate Authors:

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  USA  20418

    Naval Ship Engineering Center

    3700 East-West Highway
    Hyattsville, MD  USA  20782
  • Authors:
    • Kobayashi, S
    • Mylonas, C
  • Publication Date: 1968-6

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 22 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00007509
  • Record Type: Publication
  • ISBN: 06
  • Report/Paper Numbers: SSC-184 Prog Rpt
  • Contract Numbers: NObs 88294
  • Files: TRIS
  • Created Date: Dec 22 1972 12:00AM