中文摘要：

利用ANSYS有限元分析软件对不锈钢平底孔两种深度4种缺陷试件进行建模，施加单面热流，模拟了脉冲红外热成像检测过程。计算被检不锈钢表面的温度变化和分布，提取相应缺陷表面对应区域的降温曲线，计算不锈钢-缺陷界面热反射系数，并与实际脉冲红外热成像用于表面下识别检测实验结果进行对比。考察了有限元分析方法用于表面下缺陷类型识别的可行性，为进一步进行脉冲红外热成像用于表面下识别检测提供借鉴。

英文摘要：

ANSYS is used to simulate the detection process of pulsed thermography, and it simulates one steel sample with two depths and four kinds of defects under the excitation of planar heat flow. The temperature evolution and distribution of the detected surface of steel sample are calculated, the temperature decay curves corresponding to the defects areas are extracted to calculate the reflective coefficients of the interface between steel and defects, and the calculation results are compared with the experimental results of pulsed thermography. The possibility of identifying the subsurface defect characteristics by finite element （FE） modeling is studied, and it can be used as reference for pulsed thermography to be used for quantitatively detection.