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CONFOCAL SCANNING LASER MICROSCOPY MEASUREMENTS OF THE GROWTH AND MORPHOLOGY OF MICROSTRUCTURALLY SHORT FATIGUE CRACKS IN A1 2024‐T351 ALLOY
Author(s) -
VarvaniFarahani A.,
Topper T. H.,
Plumtree A.
Publication year - 1996
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.1460-2695.1996.tb01049.x
Subject(s) - materials science , composite material , optical microscope , paris' law , confocal laser scanning microscopy , scanning electron microscope , crack closure , aspect ratio (aeronautics) , laser microscopy , morphology (biology) , laser scanning , alloy , microscopy , shear (geology) , laser , confocal , fracture mechanics , optics , medicine , physics , biomedical engineering , biology , genetics
— A new technique for studying the growth and morphology of microstructurally short fatigue cracks is described. The technique allows short crack growth, crack depth, and crack front configuration to be measured using Confocal Scanning Laser Microscopy (CSLM). Good agreement is shown between CSLM measurements of the initial stage of crack growth (along an inclined shear plane), crack depth and aspect ratio, together with the measurements obtained using a surface layer removal technique. It is also found that non‐propagating short fatigue cracks have approximately the same aspect ratios in different specimen orientations and that the aspect ratio is independent of stress amplitude.