Design Against Fatigue Failure.
Final rept. Mar 72-Sep 75,
SYRACUSE UNIV N Y DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE
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Fatigue crack growth data in the low and intermediate stress range obtained from tests on 2014-T6 aluminum, Ti-6Al-4V and 250 grade maraging steel, and similar data on 7075-T6 and 2024-T3 aluminum available from other investigators were analyzed. This analysis led to the formation of a new model for estimating the threshold stress intensity factor range, which involves the concept of reaching the theoretical strength at the tip of the crack when the critically stressed volume becomes so small that it can no longer contain a defect. Fatigue crack propagation experiments were also conducted in the range of 10 to the minus 7 power and 10 to the minus 9 power in.cycle 2.5 x 10 to the minus 9 power to 2.5 x 10 to the minus 11 power mcycle at room temperature and 375 Hz. 7050-T73651 aluminum and D6ac steel HRC 50 were tested in room air and dry and wet argon, whereas 2014-T6 aluminum and annealed D6ac steel were tested in room air only.
- Metallurgy and Metallography