...Y. Yamada; J. C. Newman, Jr. Fatigue-crack-growth-rate tests on compact specimens have been made on a variety of materials (2024-T3, 2324-T39, 7050-T7451, 4340 steel, and Inconel-718) over a wide range in stress ratios from 0.1 to 0.9 (and 0.95 in some cases) and several K max test conditions. Test...

...J. C. Newman, Jr.; Y. Yamada; J. A. Newman Fatigue-crack-growth rate tests were conducted on compact specimens made of a 7050-T7451 aluminum alloy to study the behavior over a range in load ratios (0.1≤ R ≤0.9) and constant K max test conditions. Previous research had suggested that differences...

...Y. Yamada; J. C. Newman, III; J. C. Newman, Jr. Compression precracking has been used in a renewed effort to generate fatigue-crack growth rates in the threshold and near-threshold regimes, as an alternative to the traditional load-reduction procedure. But concerns have been expressed...