Premium
GROWTH OF FATIGUE CRACKS EMANATING FROM NOTCHES IN SiC PARTICULATE ALUMINUM COMPOSITE
Author(s) -
Biner S. B.
Publication year - 1990
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.1460-2695.1990.tb00633.x
Subject(s) - materials science , paris' law , composite number , metal matrix composite , stress concentration , fatigue testing , crack closure , aluminium , composite material , stress intensity factor , alloy , matrix (chemical analysis) , stress (linguistics) , particulates , damage tolerance , metallurgy , structural engineering , fracture mechanics , engineering , linguistics , philosophy , ecology , biology
— The initiation and growth of cracks emanating from blunt notches in 6061‐Al alloy reinforced with 25% particulate Sic metal matrix composite were investigated. To elucidate the role of aging condition of the matrix on the fatigue behavior, the studies were carried out at T6 and overaged conditions. The results show that the number of cycles required for initiation of fatigue cracks are not influenced with the notch severity and the aging condition of the matrix. The overaging heat treatment resulted in slower fatigue crack growth rates. The failure of the Sic particles during the fatigue process is given as the reason for the both observed initiation and crack growth characteristics. It is also shown that the growth rate of cracks emanating from blunt notches can be accurately described by an equivalent stress intensity factor range Δ K eq . This could provide an adequate engineering method for design against fatigue failure from various stress concentrations for this composite system.