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ISSN: 1820-0206
eISSN:
2683-5770
First published in
1950
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doi: 10.5937//str1903035C
Vol.
69, No.3 (2019), Pages: 35-40
Impressum
Contents
The Effect of
Imperfections on Crack Growth Rates in Cold Worked and Interference
Fit Holes
Cameron Coates
Ved Vakharia
This work examines the effect of imperfections on fatigue crack
growth (FCG) in lap joints (Hi-Lok fasteners). The Finite Element
Method (FEM) is used to model the cold-working and interference fit
processes. FE predictions are shown to be consistent with
experimental and computational results in the literature. The
Extended Finite Element Method (XFEM) is then used to simulate a
Mode I through crack in a rectangular plate starting at the fastener
hole subjected to cold-working and interference fit. Four constant
load ratio fatigue cases are investigated: (i) no residual stress,
no imperfection, (ii) no residual stress, imperfection, (iii)
residual stress, no imperfection and (iv) residual stress,
imperfection. XFEM predictions used with the Walker equation predict
that the presence of an axial gouge within a hole may result in a
significant decrease (23%) in the component fatigue life under
constant amplitude cyclical loading. This decrease appears to be
exacerbated if a residual compressive stress field due to cold-work
and interference fit is present
Key words:
fatigue, crack,
fastener, cold work, interference, finite element.
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