脉冲红外无损检测缺陷深度定量测量的数值模拟

Numerical simulation of defects depth quantitative measurement in pulsed infrared nondestructive testing

缺陷深度定量测量是脉冲红外热波技术定量测量的重要应用,在一维热传导理论模型基础上分析了对数温度-对数时间二阶微分峰值法计算原理。以背面有6个大小相同深度不同的平底洞不锈钢试件为例,利用Ansys模拟脉冲红外无损检测过程,采用对数温度-对数时间二阶微分峰值法计算缺陷深度。比较和分析了Ansys和脉冲红外热波实验结果,结果表明所建立Ansys模型与脉冲热波实验结果相符,可为脉冲红外热波技术缺陷深度定量测量应用提供理论依据。

Quantitative me asurement of defect depth is an important application of pulsed infrared nondestructive testing. The calculation principle of peak second derivative of the temperature decay curve in the log scale was analyzed based on one-dimensional heat conduction model. The stainless steel sample which has six fiat bottom holes with same diameters and various depths at the back surface was used. Ansys was used to simulate the process of pulsed infrared nondestructive testing. The depth of defects were calculated by method PSDT. The results of Ansys and pulsed infrared nondestructive testing were compared and analyzed, which indicate that the Ansys model in accordance with the experiment. This research provides theoretical basis for the quantitative study of infrared nondestructive testing.