蜂窝夹层结构胶接面树脂堆积的红外热像检测

Infrared Thermographic Testing of Resin Accumulation Between Panel and Honeycomb Core

为了研究树脂堆积的红外热像检测问题,文章进行了一维模型建模分析、蜂窝夹层结构样件试验验证和解剖分析。研究发现树脂堆积区域在脉冲加热后的原始热图中表现为"暗区"或"暗斑",并且这些区域的表面温度低于正常胶层厚度区域的表面温度,得出了树脂堆积可以在红外热像检测中被检出的结论。通常树脂堆积不是一种缺陷,但是对蜂窝夹层结构胶接面树脂堆积进行检测却具有重要的现实意义。判断树脂堆积区域的位置、形状和面积,将有助于改进生产工艺。对这些区域进行识别、记录和存档,可以为原位检测蜂窝积水问题提供评定的依据。

To study infrared thermographic testing of resin accumulation between panel and honeycomb core,1D model was investigated and solved by finite element method（FEM） and experiments were made on honeycomb sandwich structure samples which were dissected later in this paper.Results of the model analysis and the experiments showed that areas of resin accumulation were dark in original thermal images and temperatures of these areas were lower than those of normal areas.So areas of resin accumulation could be found out in infrared thermographic testing.Areas of resin accumulation are not defects,but nondestructive testing of resin accumulation is useful for improvement of processing technique of honeycomb sandwich structure components.It would be helpful to find areas where there was water in honeycomb core of components in-service that the position,shape and area of resin accumulation were recorded in advance.