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FATIGUE CRACK INITIATION AND PROPAGATION IN LASER‐HARDENED, MEDIUM‐CARBON STEEL
Author(s) -
Kocanda S.,
Natkaniec D.
Publication year - 1992
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.1460-2695.1992.tb01260.x
Subject(s) - materials science , residual stress , crack closure , laser , bending , composite material , fracture (geology) , carbon steel , cracking , fracture mechanics , crack tip opening displacement , structural engineering , corrosion , optics , engineering , physics
— The results of investigations into fatigue crack behaviour of laser‐hardened, medium‐carbon steel specimens under reversed bending ( R = ‐1) are presented. Characteristic features of crack behaviour, such as crack source location, temporary crack arrest at the border between laser tracks and the matrix material, and discontinuous crack growth in the laser tracks are discussed. In order to explain the sites of primary crack sources, results of residual stress measurements are included as well as analytical descriptions of these stress distributions as a function of sample depth. A mechanism of cracking has been established on the basis of fractographic analyses of fracture surfaces.