A theoretical computation model of magnetostrictive guided waves NDT output signals in ferromagnetic cylinder

Ferromagnetic materials have a property of magnetostriction, guided wave generation is based on the magnetostrictive effect, and guided wave detection is based on the inverse magnetostrictive effect. A computation model of output signals of guided waves NDT in a ferromagnetic cylinder is proposed and discussed in this paper. It focuses on the magnetic and mechanical aspects of the system and the two linear constitutive piezomagnetic equations are used to illustrate the magnetomechanical coupling. To quantify the relationship between the input current applied to exciting coil and the output voltage induced in the receiving coil of the magnetostrictive sensor, some simplifications and assumptions are made. This model reflects a general prototype in the magnetostrictive sensor reception of guided wave in a ferromagnetic cylinder, and plays an important role in quantifying calculation and NDT in the engineering application.