Abstract
Crack detection in carbon-fibre-reinforced-composites was studied by using an infrared, line scanner-based, nondestructive technique. In a unidirectional composite, 20mm long and O.2mm wide artificial cuts were made to simulate vertical surface cracks. In order to estimate the detectability of the cracks, finite difference calculations were carried out. The numerical calculations estimated that surface cracks with depths down to 80IJm were possible to be detected. In the experiments, the composite was heated with a radio frequency induction coil, and the surface temperature of the composite was monitored with the infrared line scanner. In the experiments, 160IJm deep vertical surface cracks were observed.
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