Applications of modal analysis for examining structural state of synthethic-fibre nonwoven composites
Patryk Nossol, Ralph Gliniorz, Lothar Kroll, Michael Heinrich
Quarterly No. 3, 2015 pages 130-136
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abstract The dynamic behaviour of thermoplastic samples reinforced with aramid or polyester based nonwoven fabrics has been investigated. Changes in the structural state of specimens through open hole and impact damage could be proved by changes in modal parameters. Furthermore a directionality study has been performed showing clear dependence of modal parameters and fibre orientation. An appropriate frequency band was selected for a robust structural state detection of the samples. Additionally, a special modal hammer device was used to increase the accuracy of determining the modal parameters. This work continues investigations which can serve as a foundation for modal analysis based structural health monitoring (SHM) and quality control systems for composite structures. Keywords: aramid nonwovens, polyester nonwovens, anisotropy, impact damage, open-hole, modal analysis, technical diagnostics, SHM, quality control system