| Abstract [eng] |
The aim of this thesis is to evaluate the quality of complex geometry glider longeron, made of carbon fibre reinforced plastic, by ultrasound. To achieve the aim, following tasks were raised: to analyze the literature and choose the most suitable inspection method, to design a computer model and to perform non-destructive testing simulation, to conduct the real experiment. In subject and similar research, problems such as the complex geometry of specimen, attenuation of ultrasound due to porosity content, proper choice of ultrasound frequency are encountered. To solve these problems and to evaluate the quality of the specimen, literature sources were analyzed and computer model was designed which gave tne results that the best option for the real experiment is to use 3,5 MHz and 5 MHz phased array transducers, as well as the results of the computer model, helped to determine the ultrasound signal and defects in specimen dependency. During the experiment, defects were successfully located which resulted in the final conclusion that the ultrasound phased array is one of the best quality assurance methods for in-service aerospace composite structures. |
