激励全方向性SH波的新型磁致伸缩换能器设计

Design of A New Type Magnetostrictive Transducer for Omni-Directional Shear-Horizontal Wave

提出一种使用环形柱状磁致伸缩材料作为核心元件的新型超声导波无损检测换能器结构,该换能器基于磁致伸缩材料的维德曼效应激励SH波来实现对板材的无损检测,分析了该结构换能器基于维德曼效应激励SH波的原理以及换能器的磁路结构,介绍了该新型换能器在板材无损检测中的使用方法,并通过有限元分析方法对磁致伸缩材料的维德曼效应以及该换能器激励SH波的工作过程进行有限元仿真,结果成功验证了该结构换能器激励SH波的可行性.

A new type of NDT transducers which applies an annular columnar of magnetostrictive material as the core componentis proposed.This kind of transducers could excite SH waves on the basis of Wiedemanneffects to complete the detection for plates.The principle of stimulating the SH wave based on Wiedemann Effect of magnetostrictive material and the magnetic circuit structure of the transducer is analyzed.The operationmethod of the newtype transducers for the nondestructive testing of sheets is introduced.The finite element method is used to simulate the Wiedemanneffect of the magnetostrictive material and the working process of exciting SH wave by the transducer,which successfully verifies the feasibility of the transducer to excite SH wave.