1、.393.5 铁磁材料电磁超声二维有限元数值模拟 .403.5.1 铁磁材料电磁超声数值模拟程序的开发 .403.5.2 数值计算实例 .403.6 铁磁材料电磁超声三维有限元数值模拟 .443.6.1 数值计算模型的建立 .443.6.2 数值计算结果及分析 .44西安交通大学硕士学位论文VI3.7 本章小结 .464 铁磁材料电磁超声无损检测的实验研究 .474.1 电磁超声无损检测实验系统 .474.2 电磁超声换能器的设计 .484.2.1 偏置磁场设计 .484.2.2 激励线圈设计 .494.3 铁磁材料电磁超声实验结果 .494.4 铁磁材料电磁超声数值模拟程序的实验验证 .51
2、4.5 本章小结 .525 电磁超声技术在碳素钢板减薄上的应用 .535.1 碳素钢板减薄的电磁超声数值模拟研究 .535.1.1 数值计算模型的建立 .535.1.2 数值计算结果 .535.2 碳素钢板减薄的电磁超声实验研究 .555.3 本章小结 .576 总结与展望 .586.1 主要工作和结论 .586.2 研究工作展望 .59参考文献 .60致 谢 .63攻读学位期间获得的研究成果 .64声明CONTENTSVIICONTENTS1 Preface.11.1 Research background and motivation .11.2 Research status of fe
3、rromagnetic material inspection.11.2.1 Introduction of NDT for ferromagnetic materials.11.2.2 Introduction of EMAT technique.21.3 Research status of EMAT technique.31.4 Objectives and main works .52 Basic theories and methods of EMAT .62.1 Basic principles of EMAT .62.2 Numerical simulation methods
4、of electromagnetic field in EMAT.72.2.1 Numerical calculation of magnetic field based on EMPM .72.2.2 Ar method and FEM in numerical simulation of eddy current .102.2.3 Magnetization.162.2.4 Magnetostriction .162.3 Numerical simulation for ultrasonic wave based on FEM.172.3.1 Two-dimensional FEM sim
5、ulation method of ultrasonic wave.182.3.2 Three-dimensional FEM simulation method of ultrasonic wave.213 Numerical simulation of ferromagnetic materials of EMAT.253.1 Calculation of magnetic field in ferromagnetic materials.253.1.1 Development of numerical simulation code.253.1.2 Calculation of magn
6、etic field and relative permeability .363.2 Calculation of eddy current and Lorentz force in ferromagnetic materials .283.2.1 Establishment of numerical model.283.2.2 Examples of numerical simulation.293.3 Calculation of magnetization force and magnetostriction force .333.3.1 Magnetization force .33
7、3.3.2 Magnetostriction force .343.4 Numerical calculation of pickup signal for EMAT.393.5 2D numerical simulation of EMAT for ferromagnetic materials.403.5.1 Development of numerical simulation code.403.5.2 Examples of numerical simulation.403.6 3D numerical simulation of EMAT for ferromagnetic mate
8、rials.443.6.1 Establishment of numerical model.443.6.2 Numerical results and analysis.443.7 Summaries.464 Experiment research of EMAT for ferromagnetic materials .474.1 Experiment system of EMAT .474.2 Design of EMAT.484.2.1 Design of magnetic field .48西安交通大学硕士学位论文VIII4.2.2 Design of exciting coil .494.3 Experiment results of EMAT for ferromagnetic materials .494.4 Verification of numerical code of EMAT by experiment.514.5 Summaries.
