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A crack propagation criterion based on ΔCTOD measured with 2D‐digital image correlation technique
Author(s) -
Ktari A.,
Baccar M.,
Shah M.,
Haddar N.,
Ayedi H. F.,
RezaiAria F.
Publication year - 2014
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/ffe.12153
Subject(s) - crack tip opening displacement , materials science , digital image correlation , fracture mechanics , structural engineering , crack growth resistance curve , crack closure , fracture (geology) , enhanced data rates for gsm evolution , displacement (psychology) , composite material , engineering , psychology , psychotherapist , telecommunications
The fatigue cracks growth rate of a forged HSLA steel (AISI 4130) was investigated using thin single edge notch tensile specimen to simulate the crack development on a diesel train crankshafts. The effect of load ratio, R , was investigated at room temperature. Fatigue fracture surfaces were examined by scanning electron microscopy. An approach based on the crack tip opening displacement range (ΔCTOD) was proposed as fatigue crack propagation criterion. ΔCTOD measurements were carried out using 2D‐digital image correlation techniques. J ‐integral values were estimated using ΔCTOD. Under test conditions investigated, it was found that the use of ΔCTOD as a fatigue crack growth driving force parameter is relevant and could describe the crack propagation behaviour, under different load ratio R .