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Experimental and analytical assessment of fatigue and crack propagation in cold worked open hole specimens
Author(s) -
Boni L.,
Fanteria D.,
Lanciotti A.,
Polese C.
Publication year - 2013
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12050
Subject(s) - residual stress , materials science , aluminium , aluminium alloy , alloy , structural engineering , relaxation (psychology) , composite material , engineering , psychology , social psychology
Fatigue and crack propagation tests are carried out on 7075‐T73 open hole aluminium alloy specimens. A remarkable increment of fatigue life due to the Split Sleeve Cold Expansion TM process is observed, further improved by applying the process twice on the same hole. Comparable increments are obtained by using the StressWave TM method. Specific tests are performed in order to point out a possible relaxation of the residual stresses due to fatigue loading. The results obtained reveal no relaxation phenomena in the tested specimens. The compressive residual stress around cold expanded holes is numerically evaluated. Dedicated experiments based on the Sachs method are conducted to confirm the residual stress prediction.