Effect of Sheet Thickness on the Fracture Resistance K sub c Parameter for Titanium Alloys.
NAVAL RESEARCH LAB WASHINGTON D C
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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
- Metallurgy and Metallography