考虑磁致伸缩效应的铁磁材料电磁声发射及其非线性特性研究

项目名称： 考虑磁致伸缩效应的铁磁材料电磁声发射及其非线性特性研究

项目编号： No.51207105

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电气科学与工程学科

项目作者： 金亮

作者单位： 天津工业大学

项目金额： 27万元

中文摘要： 由于高强度材料的裂纹扩展速度快，周期性载荷造成的疲劳断裂常突然发生，易造成灾难性事故，在构件的在线监测和寿命预测方面取得较为理想效果的声发射技术，对早期疲劳损伤的评定尚不理想，特别是定量检测尚难实现。本项目在非铁磁材料电磁声发射的研究基础上，拟研究铁磁性高强度板材的电磁声发射现象及其非线性特性。本项目的难点在于铁磁材料中洛伦兹力和磁致伸缩力在大小、方向和频率响应上的差异造成铁磁材料声信号的幅频特性趋于复杂。故本项目拟通过建立考虑磁致伸缩效应的电磁声发射的电磁场-力-形变分析耦合数值模型，分析磁致伸缩效应对电磁声发射的影响和作用机制，研究声发射源的特性，并观察磁致伸缩效应下电磁声发射的非线性特性，论证声发射信号的非线性特性对缺陷进行定量检测的可行性，以期在声发射技术对缺陷的定量检测方面有所突破，为声发射检测技术对铁磁性高强度材料早期疲劳损伤的定量检测以及寿命预测提供重要的理论和实验依据。

中文关键词： 电磁声发射；数值分析；磁致伸缩效应；无损检测；非线性超声

英文摘要： Due to the fast speed propagation of the crack in the high strength material, the fatigue fracture caused by the periodic load often happens suddenly, which easy causes a catastrophic accident. Acoustic Emission Technology (AET) is not ideal for the evaluation of the early fatigue damage, especially quantitative detection is still difficult to achieve, which has ideal effect to on-line monitoring and life prediction of the component. So, this project will research Electromagnetically Induced Acoustic Emission (EMAE) and nonlinear characteristics of the ferromagnetic high strength plate, based on the research on EMAE of the non-ferromagnetic plate. The difficulty is that the different of Lorentz Force and Magnetostrictive Force in size, direction, and frequency response makes features of amplitude and frequency of Acoustic Emission signal of ferromagnetic materials to be complex. In this project, features of the acoustic emission source are researched through the influence and mechanism of Magnetostrictive Effect on EMAE by the established electromagnetic-field-force-deformation coupling numerical model including Magnetostrictive Effect. And the quantitative detection of AE Technology can be demonstrated through obtained nonlinear features of EMAE under Magnetostrictive Effect, which provides important theoretica

英文关键词： Electromagnetically induced acoustic emission；Numerical analysis；magnetostrictive effect；Non-destructive testing；nonlinear ultrasonic