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- W2145125549 abstract "This note presents the results of a series ofaxial-load fatigue tests performed on Aluminum AHoy 2024-T4 extruded bar, using a mean tensile stress of 16 ksi throughout. The basic single-level S-N relation was established using nine specimens at each of fifteen alternating stress amplitudes . The statistical behavior of the single-level fatigue endurances at the 'knee.' of the S-N curve was discovered to be consistent with the rise and decay respectively of two endurance distributions, apparently representing the action of two different fatigue mechanisms. The log-endurance population during transition was found to become bimodal in nature, with the first distribution a continuation of the log normal distributions at stress amplitudes above this region. An extensive two-level test program was carried out using a procedure formulated by the author from previous exploratory work. In this procedure, the second (runout) stress level is standardized at Sa2 = 34 ksi, and the endurance at this level is used as an indication of the damage at the first level. Systematic variation of the prestress amplitude, and of the fatigue cycles for the first level, provided for the most part a continuous pattern of damage activity throughout the range of these two parameters available under the single-level S-N curve. By this procedure, areas of severe damage accumulation were delineated, as were areas of so-caHed 'healing' which occur at certain high stress levels (0 . 1% Proof Stress), and at high numbers of cycles at low stress levels. An analytical relation was found to fit the observed damage behavior at high stress levels (over o. 1% Proof Stress). The data at low stress levels are inadequate to derive a similar continuous analytical relation in this area." @default.
- W2145125549 created "2016-06-24" @default.
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- W2145125549 date "1960-05-01" @default.
- W2145125549 modified "2023-09-27" @default.
- W2145125549 title "SYSTEMATIC AXIAL LOAD FATIGUE TESTS USING UN-NOTCHED ALUMINUM ALLOY 2024-T4 EXTRUDED BAR SPECIMENS" @default.
- W2145125549 hasPublicationYear "1960" @default.
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