复合材料热波检测影响因素的数值仿真

Numerical Simulation of Influencing Factors for Thermal Wave NDT in Composite Materials

针对传统无损检测方法的缺陷,采用热波技术对导弹发动机复合材料的典型缺陷进行检测。利用数值仿真手段,模拟了热波在含缺陷复合材料中的热传导过程,并深入分析了缺陷大小、深度、厚度及热扩散系数等因素对热波检测灵敏度的影响。仿真结果表明:热波技术能够快速高效地识别缺陷的位置、大小和深度,而缺陷深度和缺陷的热扩散系数是影响热波检测的最重要因素。

For the disadvantages of traditional NDT methods, Thermal Wave Nondestructive Testing （TWNDT） technology was used to detect the typical defects in composite materials of missile motor. The heat exchange process of thermal wave in composites with defects was simulated by numerical simulation method. The factors influencing the testing sensitivity were studied, including the defect size, depth, thickness and thermal diffusion coeffcient etc. The results of the simulation show that TWNDT can identify the defect depth, size and position rapidly and effectively. And the most important factors influencing the inspection sensitivity of TWNDT are the defect depth and defect thermal diffusive coefficient.