Influence of detection according to moisture distribution of cfrp composite sandwich panels using infrared thermography

Recently, composite materials structure have been mainly used in the main wings, ailerons, and fuselages of aircrafts and the main & tail rotor blades of helicopters. As demand for light and rigid structures increases, the employment of composite materials is also increasing steadily. In the case of aircrafts using Composite Sandwich Panel for rapid-moving structures, their Composite Sandwich Panel are subject to impact by hail, lightning, bird strike and soon. At this time, the impact can cause the destruction of fiber tissues in the composite materials as well as the deformation of the composite materials, resulting in the problems of the weakened rigidity of Composite Sandwich Panel structures, moisture penetration into a tiny crack and soon. Hence, this study conducted research on a method for rapidly detecting the location and type of moisture existing in the Composite honeycomb Sandwich Panel structure by using the infrared thermography. As a result of the experiment, it was confirmed that water flattening work is required to detect defects of the specimens.