EXPERIMENTAL STUDY OF PLASTIC YIELDING AT THE TIP OF SURFACE FLAW CRACKS

An experimental investigation was undertaken to determine the stability, surface deformation characteristics, and extent of plastic yielding associated with semi-elliptical surface cracks in plates subjected to tensile loading. The experiments involved both Fe-3Si and Ti-6A1-4V specimens, and a wide range of crack geometries and applied loads were included in the test matrix. Following loading, the Fe-3Si specimens were subjected to an electrolytic etching treatment to reveal the plastic zones in various planes intersecting the crack. Available analytical models of yield zone size and stress intensity factor were used to correlate the data.

• Supplemental Notes:
  • Prepared for National Aeronautics and Space Administration.
• Corporate Authors:

  Southwest Research Institute

  6220 Culebra Road, P.O. Drawer 28510
  San Antonio, TX  United States  78228-0510
• Authors:
  • Francis, P H
  • Davidson, D L
  • Burghard, H C
  • Nagy, Andras
• Publication Date: 1971-5

Media Info

• Features: References;
• Pagination: 106 p.

Subject/Index Terms

• TRT Terms: Cracking; Notch tests; Plastic deformation; Stresses; Yield stress
• Old TRIS Terms: Crack formation; Crack stresses
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00043586
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: NASA CR-114934 Final Rpt
• Contract Numbers: NAS 9-9493
• Files: TRIS
• Created Date: Apr 13 1973 12:00AM