ABSTRACT
In order to study the fatigue mechanism of corroded cable wire and the crack propagation behavior of corroded cable wire, the equivalent treatment of corrosion pit on cable steel wires was investigated based on the equivalent theory. The stress intensity factors of equivalent corrosion pit were calculated, the distribution of the stress intensity factors was analyzed, and the optimal equivalent crack shapes of corrosion pits were determined. Based on the numerical fracture mechanics, it was simulated the fatigue crack propagation behavior initiating from corrosion pits, considering the influences of the crack morphology and the lateral friction among wires. Learn from analysis results, the irregular corrosion pits can be equivalent into seven kinds of semi-elliptical and semi-circular cracks; the wide and shallow corrosion pit is equivalent to an outer semi elliptical crack; the shape of initial crack has obvious influence on the propagation behavior; the crack mode I is mainly found in the fatigue propagation stage of corroded cable steel wire, which propagates along the direction parallel to the cross section of steel wire; without considering the fretting fatigue of the steel wire surface caused by the lateral friction, the reverse friction of steel wires can reduce the crack propagation rate.
