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针对铁磁性材料中磁致伸缩导波的产生机理,利用有限元软件创建了非线性力磁耦合磁致伸缩有限元模型,分析了非线性铁磁性在外加磁场作用下磁致伸缩力的产生,以及在该力作用下材料中质点的位移情况,实现了基于铁磁性材料非线性力磁耦合本构关系的磁致伸缩导波的产生及传播过程仿真研究.仿真结果表明,当铁磁性管道在由永磁体产生的偏置磁场及通过高频交流电流线圈所产生磁场的共同作用下,管道内质点将受到平行于磁场方向的磁致伸缩力的作用并产生高频振动形成磁致伸缩导波,通过对各质点位移情况分析可以清楚了解到导波的传播及接收过程,并通过实验验证了该仿真研究的可靠性.
Aiming at the mechanism of magnetostrictive guided wave in ferromagnetic materials, a nonlinear magnetomechanical coupled magnetostrictive finite element model was established by using finite element software. The generation of magnetostrictive force under nonlinear magnetic field was analyzed. As well as the displacement of the material in the material under the force, the generation and propagation of the magnetostrictive guided wave based on the nonlinear force-magnetic coupling constitutive relationship of the ferromagnetic material are realized. The simulation results show that when the ferromagnetic pipe is at The biasing magnetic field generated by the permanent magnet and the magnetic field generated by the high-frequency alternating current coil work together, and the particle inside the pipe will be subjected to the magnetostrictive force parallel to the magnetic field and generate high-frequency vibration to form the magnetostrictive guided wave Through the analysis of the displacement of each particle, the propagation and reception of the guided wave can be clearly understood. The reliability of this simulation is verified by experiments.