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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

contributor authorNASA - National Aeronautics and Space Administration (NASA)
date accessioned2017-09-04T15:47:47Z
date available2017-09-04T15:47:47Z
date copyright01/01/1959
date issued1959
identifier otherPZHOEEAAAAAAAAAA.pdf
identifier urihttp://yse.yabesh.ir/std/handle/yse/50686
description abstractSheet 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.
languageEnglish
titleNASA-TN-D-212num
titleAxial-load fatigue tests of 2024-T3 and 7075-T6 aluminum-alloy sheet specimens under constant- and variable-amplitude loadsen
typestandard
page40
statusActive
treeNASA - National Aeronautics and Space Administration (NASA):;1959
contenttypefulltext
subject keywordsALUMINUM ALLOYS
subject keywordsAXIAL LOADS
subject keywordsCUMULATIVE DAMAGE
subject keywordsCYCLIC LOADS
subject keywordsFATIGUE TESTS
subject keywordsGUST LOADS
subject keywordsMETAL FATIGUE
subject keywordsMETAL SHEETS
subject keywordsS-N DIAGRAMS
subject keywordsSTATISTICAL ANALYSIS
subject keywordsSTRESS ANALYSIS
subject keywordsSTRESS CYCLES
subject keywordsTENSILE PROPERTIES


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