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SHORT CRACK BEHAVIOUR IN NODULAR CAST IRON
Author(s) -
Clement P.,
Angeli J. P.,
Pineau A.
Publication year - 1984
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.1460-2695.1984.tb00194.x
Subject(s) - materials science , crack closure , composite material , displacement (psychology) , stress intensity factor , cast iron , crack tip opening displacement , graphite , metallurgy , fracture mechanics , structural engineering , engineering , psychology , psychotherapist
Fatigue crack growth rates have been determined on standard specimens containing long cracks (∼5–10mm) and on specimens containing two‐dimensional short cracks (∼0.10–0.50mm). Large differences have been observed indicating that at a given stress intensity factor short cracks propagate much faster than long cracks. Mouth opening displacement measurements for both specimen geometries have shown that the crack closure effect is largely responsible for the observed effect. These results are used to rationalize the behaviour of short cracks initiated from natural sites which were either graphite nodules or microshrinkage pores. The three‐dimensional aspect of these natural small cracks is analysed and discussed in detail.