FAA Aviation Mechanic General (AMG)Materials, Hardware and ProcessesMedium
A technician is inspecting a composite structure for delamination using a non-destructive testing method. Which method utilizes high-frequency sound waves to detect flaws by analyzing reflections and transmissions through the material?
- AUltrasonic inspection
- BEddy current inspection
- CMagnetic particle inspection
- DRadiographic inspection
Show answer & explanationAnswer & explanation
Correct answer: A. Ultrasonic inspection
Ultrasonic inspection uses high-frequency sound waves to detect internal flaws, such as delaminations in composites, by analyzing the reflected or transmitted sound signals.
Why the other options are wrong
- B. Eddy current inspection uses electromagnetic fields and is primarily used for conductive materials to detect surface and near-surface flaws.
- C. Magnetic particle inspection is only for ferromagnetic materials to detect surface and near-surface cracks.
- D. Radiographic inspection uses X-rays or gamma rays to detect internal flaws by analyzing density changes, but it's not ideal for delamination in composites as it primarily shows voids or inclusions.
Ultrasonic Inspection
A non-destructive testing (NDT) method that uses high-frequency sound waves to detect internal flaws, measure thickness, or characterize material properties by analyzing the reflected or transmitted sound energy.
- Effective for detecting delaminations, voids, and disbonds in composites.
- Can be used on various materials, including metals and composites.
- Requires a coupling medium to transmit sound waves.
Memory trick: Ultrasound's sound waves reveal hidden composite flaws.