Accession Number:

AD0748644

Title:

Fracture and Fatigue-Crack-Propagation Characteristics of 1/4-Inch Mill-Annealed Ti-6Al-4V Titanium Alloy Plate

Descriptive Note:

Final rept. 5 Jan 1970-30 Jun 1971

Corporate Author:

BATTELLE COLUMBUS DIV OH

Report Date:

1971-11-01

Pagination or Media Count:

88.0

Abstract:

The fracture and fatigue-crack-propagation behavior of central through-the-thickness cracks has been evaluated in 14-inch-thick mill-annealed titanium alloy plate. The influence of crack aspect ratio on the fracture or residual strength of three panel widths has been determined. The fatigue-crack- propagation rates for various maximum stresses, stress ratios, and panel widths have been evaluated. It was observed that elastic fractures in the presence of central through-cracks do not occur in panels of this material less than 18 inches wide. Uniform and regular fatigue-crack-propagation behavior is noted. A fatigue-crack-propagation threshold is evident below 3 or 4 ksisq in. Power law modeling of rate data, crack life prediction, and interpretive discussions were also considered.

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE