The Resonance-Impedance Method as a Means for Quality Control of Advanced Fiber Reinforced Plastic Structures

摘要

The principles of resonance impedance testing applied to the mechanical properties of bonded structures are reviewed. For fiber reinforced laminates, the influence of laminate thickness, voids and density variations are discussed. The use of reference standards, showing acceptable laminate quality for each configuration, is cited for complicated composite structures. Ultrasonic C-scan pictures of a carbon fiber epoxy laminate are compared with Fokker Bond Tester readings of the same panel, showing the presence of voids. Applications of the resonance-impedance method during the fabrication of structures for the F-14, the B-1 bomber, and for the DC-10 are mentioned.