A non-destructive method for the determination of the direction and magnitude of the principal stresses at any location in a structure, such as a ship or a bridge, has been investigated and developed as reported here, in an effort to overcome the generally destructive and costly methods presently available. This non-destructive method consists of attaching electric-wire strain gages around the point at which the stress is to be measured and then drilling a hole (1-1/8 in. to 1 in. diameter) at that point. The gage reading before and after the drilling of the hole are used to determine the stress. Known stress values up to 15,000 psi were applied to test plates, and measurements were made by the hole relaxation method. When corrected for the stresses initially contained in the plates, this hole relaxation method checked the known applied stresses to within 1000 psi. The holes are easily and economically repaired.

  • Corporate Authors:

    Princeton University

    Princeton, NJ  United States  08540

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  United States  20418
  • Authors:
    • Riparbelli, C
    • Suppiger, E W
    • Ward, E R
  • Publication Date: 1958-9-15

Media Info

  • Features: References;
  • Pagination: 48 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00330992
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC- 42 Final Rpt.
  • Contract Numbers: NObs-47613
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM