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THE GROWTH OF SMALL FATIGUE CRACKS IN 7075–T6 ALUMINUM
Author(s) -
LANKFORD J.
Publication year - 1982
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/j.1460-2695.1982.tb01251.x
Subject(s) - materials science , paris' law , aluminium , metallurgy , alloy , fracture (geology) , fracture mechanics , crack closure , precipitation , composite material , physics , meteorology
— The growth of ‘small’, half‐penny shaped surface fatigue cracks in a precipitation hardened aluminum alloy is compared with the growth of ‘large’cracks in fracture mechanics type specimens. It is found that the small cracks grow much faster than LEFM equivalent large ones, and also experience growth rate perturbations. It is suggested that localized microplasticity in nominally elastic specimens is responsible for the rapid growth of small cracks and that grain size limitations on the microplastic regions cause transient decelerations and sometimes permanent arrest, in crack growth.