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Elastoplastic modelling of subsurface crack growth in rail/wheel contact problems
Author(s) -
LUNDÉN R.
Publication year - 2007
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.1460-2695.2007.01160.x
Subject(s) - crack closure , materials science , crack growth resistance curve , structural engineering , fracture mechanics , shear (geology) , crack tip opening displacement , strips , yield (engineering) , geotechnical engineering , closure (psychology) , composite material , engineering , market economy , economics
Propagation of small subsurface cracks subjected to shear under repeated rolling contact load is studied. An analytical crack model (Dugdale) with plastic strips at the two crack tips is employed. Compressive stresses promoting crack closure and friction between crack faces are considered. The triaxial stress state is used in the yield criterion. A damage criterion is suggested based on experimental LCF data. In a numerical study, critical crack lengths are found below which propagation of an existing crack should be effectively suppressed.