Accession Number:

AD0753198

Title:

Effect of Sheet Thickness on the Fracture Resistance K sub c Parameter for Titanium Alloys.

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

• Freed,C. N.
• Sullivan,A. M.
• Stoop,J.

Report Date:

1972-11-08

Pagination or Media Count:

22.0

Abstract:

The influence of sheet thickness on the plane stress fracture resistance parameter K sub c has been investigated for four high-strength titanium alloys. The center-cracked-tension CCT specimen was employed over a thickness range from 132 to 18 in. The effect of thickness on K sub c varied with each alloy. The more frangible alloys evidenced peak K sub c values in thinner specimens than those alloys manifesting higher fracture resistance. Slit tips with 1-mil radii indicated lower K sub c values than tips of 3 to 5 mils. No influence of initial crack length was noted over the range studied. The data were applied to a model which postulates the K sub c dependency on thickness. Author

Descriptors:

• (*TITANIUM ALLOYS
• FRACTURE(MECHANICS))
• SHEETS
• THICKNESS

Subject Categories:

• Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE