Guided Wave Propagation In Porous Unidirectional CFRP
Networks of piezoelectric transducers mounted on aircraft structures for Acousto Ultrasonics (AU) purposes are designed to be applied during the service life of the aircraft. The approach to integrate these sensor networks already during the manufacture of CFRP host structures prompted ideas to achieve an additional benefit by their application for cure monitoring, thus extending their use to the manufacturing chain. This benefit could be extended even further if guided waves generated by AU sensor networks could be used for porosity testing extensively applied for CFRP aircraft structures. In light of this, a study is being conducted to investigate effects of porosity on the propagation of guided waves in a basic configuration of unidirectional CFRP. Several samples were manufactured at different porosity levels by variation of the processing pressure. Wavefields were acquired using an ultrasonic scanning device. In the present work, results of the wavefield data analysis is presented and discussed regarding the influence of porosity on guided waves and basic applicability for porosity testing of aircraft structures.