Magnetic Field Distribution Around Magnetized Steel Ropes and Its Modulation by Rope Defects

The paper is devoted to the modelling of the magnetic field around magnetized steel rope kinds using the ANSYS software package. The influence of wire cracks on the amplitude distribution of the generated field is specified for two steel rope kinds assuming surface and inner defects. The first rope is characterized by six rope strands where each is completed by 28 wires (two different diameters, 11 thick wires and 15 thin ones), while the second one has a Z-geometry with special cross section of wires located on rope surface. The results show a significant influence of surface defects (more 10 mT) and measurable magnetic flux responses (in the frame some mT) by cracks in the inner wires with 1 mm gaps. The limits for nondestructive testing of demonstrated ropes are described in detail.