The inspection of large aerospace CFRP components with ultrasonic techniques is subject to very challenging requirements in terms of ensuring a reliable and time efficient nondestructive examination. The different approaches such as squirter, immersion and contact techniques are discussed under these aspects, which seem to be contradictory at first view. Assessing the advantages and the weak points of each of these methodologies, the conclusion resulted in a contact technique combining high frequency conventional and low frequency phased array probes. This system facilitates pulse echo technique and backwall monitoring - even in the nonparallel sections - as two complementary sources of information about the structural integrity of the component. The development of this technique and its optimization performed have helped to determine the optimized parameters of such techniques and the optimum number of channels between 'very high' associated with high cost fast examination and 'low' as a low-cost version, which in turn requires a considerable time for the examination. Based on the stringent requirements for an ultrasonic system in terms of timely performance and high sensitivity and defect detection reliability a system has been generated, which is seemingly complex and bulky. However, this system helped to reduce the inspection time by a factor of up to 10 related to systems used up till now. Therefore, the higher cost of such system is compensated by its time-saving performance and reliability within a very short period.
Testing large aerospace CFRP components by ultrasonic multichannel conventional and phased array pulse-echo techniques
Prüfung großer Luftfahrt-Komponenten aus kohlefaserverstärktem Kunststoff mittels konventioneller Mehrkanalprüfung und Impulsechoverfahren mit Gruppenstrahler
2002
9 Seiten, 7 Bilder, 1 Quelle
Aufsatz (Konferenz)
Datenträger
Englisch
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