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Can pure mode III fatigue loading contribute to crack propagation in metallic materials?
Author(s) -
POKLUDA J.,
PIPPAN R.
Publication year - 2005
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.1460-2695.2004.00843.x
Subject(s) - materials science , crack closure , fracture mechanics , mode (computer interface) , torsion (gastropod) , alloy , paris' law , metal , structural engineering , crack growth resistance curve , composite material , metallurgy , engineering , computer science , medicine , surgery , operating system
The possibility of pure mode III crack growth is analysed on the background of theoretical and experimental results obtained in the last 20 years. Unlike for modes I and II, there is no plausible micromechanistic model explaining a pure mode III crack growth in ductile metals. In order to realize ‘plain’ mode III fracture surface, we propose the propagation of a series of pure mode II cracks along the crack front. Fractographical observations on crack initiation and propagation in a low alloy steel under cyclic torsion support such a model. The authors have not seen any clear indication of a pure mode III crack growth micromechanism in metals until now.