Experimental and numerical characterisation of ferromagnetic ropes and non-destructive testing devices

The paper mainly deals with the magnetic characterisation of ferromagnetic ropes. The knowledge of the magnetic characteristic is useful in the design of nondestructive testing equipments with particular reference to the design of the magnetic circuit in order to reach the required rope magnetic behaviour point. The paper is divided into two main sections. In the first part a description of the experimental procedure and of the provided setup devoted to the measurement of the non linear magnetic characteristic of different rope manufactures and different types is presented. In the second part of the paper the magnetic model of the ropes is developed for the simulation of a non-destructive device under working conditions. The simulation is provided with a non linear three dimensional numerical code based on the Finite Integration Technique. Finally the numerical results are compared with some experimental tests under working conditions.

Author(s): A. Canova, F. Degasperi, F. Ficili, M. Forzan and B. Vusini