Holistic approach for structural integrity evaluation of composite main rotor blades

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Holistic approach for structural integrity evaluation of composite main rotor blades

Dragan, Krzysztof Z. / Klimaszewski, Slawomir

This work presents modern approach for damage detection in the composite main rotor blades MRB of helicopters. All inspections were made with the use automated systems based on Personal Computer - acquisition and database collection. Non Destructive Testing Methods used for the purpose of that work were the following: qualitative: shearography, DAIS; quantitative: Mechanical Impedance Analysis, Pitch - Catch, Ultrasonic. In the article results inspection of specimens with artificial defects made from composite specimens: carbon and glass fiber with sandwich and multilayer and honeycomb structure are presented. Results describe detectability and Possibility of Detection (PoD) for flaws of different size, shape and different kind. Moreover estimation of size was delivered with the use of measurement tools included in the software of automated systems. For comparison of accuracy and reliability of those system software used Kernel of Mathematica Library was created. This software is based on criteria defined for the user and makes possible automatic calculating size of the defect. That software enables much faster and much accurate size estimation of defects. Moreover for the future purposes possibility of automated procedures for flaw estimation could be developed.