中文摘要：

为探索脉冲涡流热成像技术中涡流与裂纹平行时的响应规律并分析致热机理,运用有限元仿真软件分析了具有贯穿裂纹缺陷的铁磁、非铁磁材料平行激励时的温度分布;运用MATLAB软件提取仿真及实验数据定量分析磁通密度、电流密度、温度等参数并探究了导致铁磁、非铁磁材料温度分布差异的原因;提出铁磁材料除尖端效应外,裂纹内表面趋肤效应导致裂纹边缘温度升高,非铁磁材料裂纹内表面趋肤效应和裂纹边缘涡流密度增大共同作用导致裂纹边缘温度升高。运用高周波电感应加热器进行了实验验证。实验结果与仿真分析存在较好的一致性。研究成果揭示了非铁磁材料平行激励下的温度响应规律,为工程应用中可能的各方向裂纹定性分析和定量表征奠定基础。

英文摘要：

In order to explore the response and the heating mechanism of pulse eddy current thermography when eddy current parallels to the crack,the heat distribution of ferromagnetic and non-ferromagnetic materials across crack defect was analyzed by the finite element under parallel excitation; the difference of temperature distribution between non-ferromagnetic and ferromagnetic materials was explored by analyzing the parameters of magnetic flux density,current density,temperature,etc. The result shows that the crack edge temperature increases besides the tip effect,which is caused by surface skin effect on the ferromagnetic materials. A high frequency induction heater is used to verify the conclusion. The experiment results are consistent with the simulation data and mechanism analysis. Research results reveal the temperature response of non-ferromagnetic materials under parallel excitation,and lay the foundation for the possibility of engineering application in the crack of the qualitative analysis and the quantitative characterization.