复合材料红外热波检测影响因素的模拟研究

Simulation on Influencing Factors of Infrared Thermal Wave Detection of Composite Materials

采用有限元数值模拟的方法,在三维瞬态红外热波检测数学模型的基础上,分别对复合材料缺陷直径、缺陷厚度、缺陷埋深、材质、热流密度、热激励时间以及对流换热系数等影响因素进行了红外热波检测的模拟,分析了以上各影响因素对温差和对比度的影响。结果表明:在以上影响因素中,缺陷材质对检测参数的影响最大,之后依次为缺陷埋深、热激励时间、热流密度、缺陷直径、缺陷厚度,其中对流换热系数对检测参数的影响最小,几乎可以忽略。

There are many influencing factors in the infrared thermal wave detection of composite materials.In this paper,the finite element numerical simulation method is used to simulate the infrared thermal wave detection on the effect of the defects diameter,defect thickness,defect depth,defect materials,heat flux,heat excitation time and convection heat transfer coefficient based on the mathematical model of the three-dimensional transient infrared thermal wave detection.The influence of the above factors on detection parameters(temperature difference and contrast ratio) is analyzed.The results show that among the above factors the most influential factor is defect materials,and followed by the defect depth,thermal excitation time,heat flux,defect diameter,defect thickness,and convection heat transfer coefficient has the smallest impact on detection parameters,almost negligible.