Heat emission from damaged composite materials and its use in nondestructive testing

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Abstract
Some experimental and theoretical limits are investigated for a technique of nondestructively locating shear cracks in carbon and glass fibre reinforced plastics (CFRP and GFRP). The technique is based on the phenomenon that when a cracked material is subjected to oscillating stresses of sufficient magnitude, heat is generated owing to friction between opposite sides of the crack. Theoretical predictions have been made of the expected temperature rises, and these have been checked experimentally by using an infrared scanner. It was shown that the technique is more sensitive with GFRP owing to the substantially higher thermal conductivity of the carbon fibres. The technique has the possibility of being used to detect defects in composite sub-structures without removing them from the main assembly.

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