RESIDUAL STRAINS AND DISPLACEMENTS WITHIN THE PLASTIC ZONE AHEAD OF A CRACK

Strains and displacements in the plastically yielded region generated ahead of a machined notch and a crack were detected with an interferometric technique. The measurements were performed on Fe-3Si steel sheets after unloading and reflect local yielding under plane stress conditions. The results show that notch acuity within the limits examined has little effect on the strain distribution. Measured displacements are qualitatively in accord with the theoretical expectations of the DM (Dugdale-Muskhelishvilli) model. Quantitative agreement is not obtained and this is attributed to work hardening and the Bauschinger effect, complications that are neglected in the calculation. The work also draws attention to a parameter--the width of the plastic zone at half maximum strain--useful for connecting displacement with maximum strain.

• Supplemental Notes:
  • Sponsored by the Naval Sea Systems Command, Washington, D.C. 20362.
• Corporate Authors:

  Ship Structure Committee

  National Academy of Science, 2101 Constitution Avenue, NW
  Washington, DC  United States  20418
• Authors:
  • Cammett, J
  • Rosenfield, A R
  • Hahn, G T
• Publication Date: 1966-11

Media Info

• Features: References;
• Pagination: 16 p.

Subject/Index Terms

• TRT Terms: Cracking; Notch tests; Residual stress; Stresses; Structural analysis
• Identifier Terms: Ship Structure Committee
• Old TRIS Terms: Crack stresses; Residual stresses
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00164222
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: SSC-179 Prog Rpt.
• Contract Numbers: NObs-92383
• Files: TRIS
• Created Date: Oct 29 1977 12:00AM