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- W330882504 abstract "Abstract : The dependence of cyclic nonlinear energy toughness on the fatigue lives of precracked specimens was studied using two aluminum alloys, 2024-T3 and 7075-T6. An exponentially increasing load program was used for determining the fatigue lives. The cyclic toughness values for both alloys decreased as a logarithmic function of the fatigue lives. For a given life the toughness value for 2024-T3 was higher than that for 7075-T6, but the difference decrease with increasing cyclic life. An accelerated test program for prediction of constant amplitude fatigue lives of precracked specimens was undertaken. An analytical basis for this method was developed using an exponentially increasing load sequence. Accelerated tests were carried out on 2024-T3 and 7075-T6 using linearly and exponentially increasing loads and appropriate curves of the form of higher-order hyperbolas were fitted to the data using the method of least squares. The constant amplitude curve predicted from these results will be compared with the constant amplitude test results in the second stage of this program. (Author)" @default.
- W330882504 created "2016-06-24" @default.
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- W330882504 date "1979-05-01" @default.
- W330882504 modified "2023-09-24" @default.
- W330882504 title "Development of Fracture Mechanics Concepts Applicable to Aircraft Structures." @default.
- W330882504 hasPublicationYear "1979" @default.
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