Accession Number:

AD0683061

Title:

DETERMINATION OF RESIDUAL STRESS PROFILES BY X-RAY DIFFRACTION AND STRAIN GAGE METHODS FOR BRAKE-PRESS FORMED Ti-6Al-4V,

Descriptive Note:

Corporate Author:

BOEING CO RENTON WASH COMMERCIAL AIRPLANE DIV

Personal Author(s):

Report Date:

1968-12-09

Pagination or Media Count:

41.0

Abstract:

The residual stress profiles stress versus depth from brake-press formed Ti-6Al-4V annealed right angle bends were determined by the two-exposure X-ray diffraction method and a stress relaxation strain gage method using either continuous or stepwise incremental chem-milling. Results from the strain gage method were tested on four available stress formulations. The Haigh equation computer program NORS was found most suitable and is recommended for future use. A reasonable correspondence was found between the residual stresses calculated from X-ray peak shift data and those from strain gage data. Residual stresses obtained by the strain gage method utilizing chem-milling were found reproducible to within 3 to 5 ksi. Residual stress profiles of the brake-press formed bends indicate compressive stress -30 ksi near the outside bend surface and tensile stresses 40 to 50 ksi on the inside bend surface. Depth of the compressive stresses varied from 0.008 to 0.012 inch. No significant differences were found between the residual stress profiles of bends 0.045-inch thick and those 0.050-inch thick. Author

Subject Categories:

  • Metallurgy and Metallography
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE