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MODE I AND MIXED MODE I/II FATIGUE CRACKING IN Ni 3 Al(CrB) SINGLE CRYSTALS
Author(s) -
Zhang G. P.,
Wang Z. G.
Publication year - 1997
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.1460-2695.1997.tb01532.x
Subject(s) - materials science , intermetallic , crystallite , cracking , cleavage (geology) , single crystal , composite material , mode (computer interface) , fracture (geology) , metallurgy , mixed mode , crystallography , structural engineering , chemistry , alloy , computer science , engineering , operating system
— Nominal mode I and mixed mode I/II fatigue tests were carried out using the intermetallic compound Ni 3 Al(CrB) in the form of single crystal specimens. The effects of crystal orientation and load mode on fatigue crack initiation and growth were studied. The fracture surfaces of the single crystals were characterized by a cleavage‐like appearance and cracking occurred either on a single {111} plane or on multiple {111} planes irrespective of whether mode I or mixed mode I/II loadings were applied. It was found that the crack initiation and growth behaviour are dependent on both crystal orientation and applied loading mode. The cracking behaviour predicted by three mixed mode fracture criteria (MTS, SED and G criteria) in polycrystalline materials under mixed mode loading can be understood from the present results on single crystals.