OS11-2-4 Development of Composite Specimens for Infrared Thermography Nondestructive Inspection

Recently the level of using composite materials (CFRP,GFRP) has been gradually higher in all different kinds of industries, and especially composites is mainly used as a core material for important parts such as airplane body.As a technique for quality tests and stability evaluation, NDT (Nondestructive Testing), likely to support such key technologies, can improve enough to be replaced with the existing infrared thermography nondestructive testing, and it is also a very useful technique applicable to composite material structures since it can detect physical properties and defects without destroying objects, such as composite materials, industrial facilities, plants, structures and weld zones, by using radiation, ultrasonic waves, electromagnetism, heat and light energy, etc.To detect defects inside the laminate of composite materials by using infrared thermography, this study manufactured and compared artificial defect specimen according to the kinds of defects (delamination and inclusion), defect size and defect depth in laminate, and the composite materials used for this experiment were as follows: Firstly, as a material widely used for aerospace, Cycom 5276-1 G40-800-24K UD Tape, created by synthesizing Cycom 5276-1 epoxy resin with high-strength T800 one-way carbon fiber, was used.Secondly, as a material applied to electronic PCB substrates and wind powergeneration blades, SKY FLEX UGN 150, created by synthesizing epoxy resins with one-way E-glass fiber, was also used for comparative evaluation In this study, a defect detection basic experiment was conducted on artificial defect specimen manufactured with two kinds of materials by using nondestructive testing technique using infrared and lock-in technologies out of the active methods.