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Effect of Cold‐Working by hole expansion on fatigue life of 7075‐T7351 and 7475‐T761 Aluminum lugs with and without initial flaws under maneuver loading spectrum
Author(s) -
Buch A.
Publication year - 1987
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19870180305
Subject(s) - expansion ratio , aluminium , materials science , structural engineering , distortion (music) , composite material , engineering , amplifier , optoelectronics , cmos
The effect of cold working by hole expansion on fatigue life of aircraft lugs under maneuver and constant amplitude laoding was investigated. Of the two nominal expansion levels used, 2% expansion resulted in greater life improvement than the larger expansion of 3.3%. The reason for this was the relatively small w/d ratio and lug head shape distortion caused by the larger expansion. The hole expansion had a more beneficial effect in the case of lugs with 1 mm deep initial flaws than lugs without flaws. Hole expansion considerably improved the damage tolerance of the lugs investigated.