Influence of Calibration Procedure Upon Determination of J sub I sub c for a Titanium 6Al-4V Alloy.
NAVAL RESEARCH LAB WASHINGTON D C
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The influence of calibration procedure on the determination of J sub I sub c from fatigue-precracked elastic-plastic specimens of a Ti-6Al-4V alloy has been examined. Results are compared from five compliance-type calibrations, each derived from sets of load vs load-point-displacement diagrams which differ in origin. These sets include diagrams obtained from notched specimens of two different thicknesses, diagrams generated analytically from the plane-stress and plane-strain solutions of Bucci et al. as corrected for machine contribution to displacement, and from the uncorrected plane-stress solution which simulates well the load vs load-point-displacement behavior of the fatigue-precracked specimens. The J sub I sub c results obtained from these five calibrations are in substantial agreement with each other and with a known value of K sub I sub c for this material. Preliminary results from application of the deep-slot bend approximation are in accord with those determined from the compliance-type calibration procedures. Autho
- Metallurgy and Metallography