Non-Destructive Measurement Methods (Neutron-, X-ray Radiography, Vibration Diagnostics and Ultrasound) in the Inspection of Helicopter Rotor Blades

Abstract : The experiments regarding structural failures in helicopter rotor blade's composite structures causing water penetrations and bypasses were performed at the Dynamic Radiography Station (DRS) of the Budapest. As well as the structural integrity of repaired region were studied by applying dynamic neutron, X-ray radiographies and vibration diagnostics disclosed were horizontal and vertical primary and secondary percolation by-passes, the pore distribution patterns filled with water. The micro localization of structural failures were revealed and underlined by vibration diagnostics, too. Later our customers modified their requirements. Basically they wanted to avoid the risk to human life by radiography techniques and instead of them, the semi-contactless vibration diagnostics and the ultrasound test were suggested. Thus a new measurement technology and strategy was developed. Ten pieces of reference sample were produced. First half of them did not contain any errors and the second half has contained one error per piece only. The results of the new methods were compared to the radiography pictures.