CUMULATIVE FATIGUE DAMAGE UNDER CYCLIC STRAIN CONTROL.
Final Rept. 1 Feb 66-30 Apr 67,
ILLINOIS UNIV URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS
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Cyclic deformation resistance and fatigue damage accumulation are investigated using multiple level strain control. Data are reported for 2024-T4 and 7075-T6 aluminum alloys, aircraft quality SAE 4340 steel, and Titanium 811. Effects of cyclic strain level, sequence of straining, number of blocks, and mean stress are investigated. For combinations of relatively large cyclic strain ranges there is no mean stress present and damage summations based on completely reversed strain vs life plots are close to one. Tensile or compressive mean stresses may be induced when the cyclic strain sequence is from a high to a low level. Damage summations based on completely reversed strain vs life data are reduced if the mean stress is tensile and are generally increased if the mean stress is compressive. Author
- Metallurgy and Metallography