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An elastoplastic analysis of a uniaxially loaded sheet with an interference-fit boltThe stresses and strains in a uniaxially loaded sheet with an unloaded interference-fit bolt were calculated by an elastoplastic finite-element analysis. The material properties represented a 7075-T6 aluminum alloy sheet and a steel bolt. The analysis considered the two ideal cases of no slip and no friction at the bolt-sheet interface for a single combination of bolt diameter, interference level, and cyclic loading. When the bolt was inserted, the sheet deformed plastically near the hole; the first tensile load cycle produced additional yielding, but subsequent cycles to the same level caused only elastic cyclic stresses. These stresses together with fatigue data for unnotched specimens were used to estimate crack initiation periods and initiation sites. The cases analyzed with interference-fit bolts were predicted to have crack initiation periods which were about 50 times that for a clearance-fit bolt. Crack initiation was predicted to occur on the transverse axis at a distance of about one radius from the hole.
Document ID
19740027191
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Crews, J. H., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
October 1, 1974
Subject Category
Structural Mechanics
Report/Patent Number
NASA-TN-D-7748
L-9593
Accession Number
74N35304
Funding Number(s)
PROJECT: RTOP 501-22-02-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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