Speckle interferometry for detection of subsurface damage in fibre-reinforced composites

Abstract

A recently reported new technique renders speckle interferometry applicable for measuring high local displacement gradients. This paper reports how the technique is used to detect and quantify damage in fatigued carbon fibre-reinforced plastic laminates via its effect on surface displacements. Moreover, the measured displacement fields are used to verify a finite element damage model. The accuracy of the delamination measurement is confirmed by ultrasonic results.