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NASA-TN-D-212
Axial-load fatigue tests of 2024-T3 and 7075-T6 aluminum-alloy sheet specimens under constant- and variable-amplitude loads
Year: 1959
Abstract: Sheet specimens of 2024-T3 and 7075-T6 aluminum alloy with a theoretical elastic stress concentration factors KT = 4.0 were subjected to repeated axial loads. The load amplitude was held constant or varied by steps to approximate a gust load history. The variable-amplitude test data were analyzed assuming linear cumulative damage, and a limited statistical analysis was used to confirm conclusions. The value of the summation of cycle ratios Σn/N was found to vary with material, loading sequence, and mean stress.
In addition, the possible effects of load spectrum, block size, number of stress steps, and S-N curve reliability are discussed.
In addition, the possible effects of load spectrum, block size, number of stress steps, and S-N curve reliability are discussed.
Subject: ALUMINUM ALLOYS
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:47:47Z | |
| date available | 2017-09-04T15:47:47Z | |
| date copyright | 01/01/1959 | |
| date issued | 1959 | |
| identifier other | PZHOEEAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/50686 | |
| description abstract | Sheet specimens of 2024-T3 and 7075-T6 aluminum alloy with a theoretical elastic stress concentration factors KT = 4.0 were subjected to repeated axial loads. The load amplitude was held constant or varied by steps to approximate a gust load history. The variable-amplitude test data were analyzed assuming linear cumulative damage, and a limited statistical analysis was used to confirm conclusions. The value of the summation of cycle ratios Σn/N was found to vary with material, loading sequence, and mean stress. In addition, the possible effects of load spectrum, block size, number of stress steps, and S-N curve reliability are discussed. | |
| language | English | |
| title | NASA-TN-D-212 | num |
| title | Axial-load fatigue tests of 2024-T3 and 7075-T6 aluminum-alloy sheet specimens under constant- and variable-amplitude loads | en |
| type | standard | |
| page | 40 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1959 | |
| contenttype | fulltext | |
| subject keywords | ALUMINUM ALLOYS | |
| subject keywords | AXIAL LOADS | |
| subject keywords | CUMULATIVE DAMAGE | |
| subject keywords | CYCLIC LOADS | |
| subject keywords | FATIGUE TESTS | |
| subject keywords | GUST LOADS | |
| subject keywords | METAL FATIGUE | |
| subject keywords | METAL SHEETS | |
| subject keywords | S-N DIAGRAMS | |
| subject keywords | STATISTICAL ANALYSIS | |
| subject keywords | STRESS ANALYSIS | |
| subject keywords | STRESS CYCLES | |
| subject keywords | TENSILE PROPERTIES |