TIME RESOLVED LINE FOCUS ACOUSTIC MICROSCOPY OF COMPOSITES

摘要

The reflection signals from a time-resolved line focus transducer are significantly dependent on rotation angles and lens defocus. Due to the low density of graphite epoxy composites, the fluid loading has significant influence on reflection signature. The surface wave disappears and the amplitude of the lateral wave becomes larger. The time delay of the lateral and bulk waves reflected from bottom surface can be used in elastic constant determination.