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Accession Number:
ADA076370
Title:
An Analysis of Residual Stresses and Displacements Due to Radial Expansion of Fastener Holes
Corporate Author:
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
Report Date:
1979-07-01
Abstract:
Pre-expanding fastener holes with an oversize mandrel has received considerable attention for use in aircraft structures, since this process has been shown to greatly improve the fatigue life of fastener holes. The deformation theory of plasticity is used here to determine the residual stress and displacement field caused by this process. Employing plane stress assumptions, general results are obtained for various interference levels and are presented in a graphical form useful to the designer. In addition, this analysis indicates that there is an optimum level of interference dependent primarily on the plate geometry. The optimum interference levels agree well with experience values established by fatigue testing in aircraft structural alloys.
Descriptive Note:
Final rept. Jan 1975-Dec 1978
Supplementary Note:
DOI: 10.21236/ADA076370
Pages:
0037
Distribution Statement:
Approved for public release; distribution is unlimited.
File Size:
13.36MB
