关键词: 漏磁场, 钢丝绳, 数值模拟, 无损探伤

Abstract:

On the basis of 3D modeling and using finite element method, within weak magnetic excitation, the magnetic field and its airspace vector distributions of strand wire rope complex surface were simulated, then the influence of wire rope defects on the leakage magnetic field distributions around surface and airspace were also analyzed. The results show that without defects the leakage magnetic field distributions in the airspace around strand wire ropes are corresponding to its strand contour and periodic varing in circumferential direction, the variation period is as strand pitch, and with defects existence the periodic leakage magnetic field is destroyed and its magnitude enlarges evidently. According to the results of theoretical analysis, a wire rope NDT experimental systems was built based on weak magnetic excitation, then the measured waveforms of leakage magnetic fields to different broken wire defects were obtained, and correctness of simulation results were confirmed by the experiments.

Key words: leakage magnetic field, strand wire rope, numerical simulation, nondestructive testing(NDT)