Premium
A CRITICAL STUDY OF THE CRACK CLOSURE EFFECT ON NEAR‐THRESHOLD FATIGUE CRACK GROWTH
Author(s) -
Minakawa K.,
Newman J. C.,
McEvily A. J.
Publication year - 1983
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.1460-2695.1983.tb00351.x
Subject(s) - crack closure , materials science , closure (psychology) , paris' law , aluminium , crack growth resistance curve , crack tip opening displacement , alloy , work (physics) , composite material , metallurgy , fracture mechanics , mechanical engineering , engineering , economics , market economy
— Crack closure in the near‐crack‐tip region has been considered to be an important contribution to the development of a crack‐growth threshold for macroscopic cracks. Recent analytical work, however, has suggested that closure well back of the tip may be the controlling factor. In order to check on this possibility, material has been machined away far behind the crack tip in order to eliminate long‐range closure. Removal of this material did not eliminate the threshold, but did lower the threshold level by approx. 10% for tests conducted on 6.3 mm‐thick X7090‐T6 powder metallurgy aluminum alloy.