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 | http://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 |