From the course: Introduction to Composite Manufacturing
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Tap testing
- [Instructor] Tap testing is sometimes referred to as audio sonic testing or coin tapping. This technique makes use of frequencies and their audible range. It's a surprisingly accurate method in the hands of an experienced person. Tap testing is perhaps the most common technique used for the determination of internal damage, delamination. and desponding. The way this works is by tapping the inspection area with a solid round disc or a light-weight hammer like device and listening to the response of the strike to the hammer. A clear, sharp, ringing sound is indicative of a well bonded solid structure. While a dull or thud like sound indicates an area that has a discrepancy. Think of it like this, a solid structure allows the sound to pass through cleanly. Thus, you hear a resounding tap sound. If two or more of the plies pull apart or there's a crack in the resin that void space between the plies or in the resin acts as…
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