Experimental and Numerical Investigations of the Damage-Dependent Vibration Behaviour of Textile Reinforced Composite Structures
Proceedings of the International Conference on Structural Engineering Dynamics (ICEDyn 2013) 2013
Werner Hufenbach, Robin Höhne, Pavel Kostka, Albert Langkamp, Sandris Ručevskis, Pāvels Akišins

Novel 3d-textile reinforced composites offer outstanding mechanical properties as well as energy absorption capabilities in comparison to classical composites. Thus, there is a growing potential for their use in innovative high performance structures potentially exposed to impact and crash events, e.g. aircraft components. An important benefit of these composites is the gradual and adjustable damage behaviour, which enables to initiate appropriate action after an unpredictable impact or crash event. In order to permit reliable information about the remaining operational capability of the structure, the induced damage needs to be identified. Therefore, the use of vibration-based damage identification methods is common. A detailed characterisation of the complex interdependencies between damages and the structural dynamic properties of composite structures is usually not feasible in an experimental way. Alternatively, appropriate models can be used for an extensive numerical investigation. In this case, a precise determination of the material properties and their local distribution in the damage area has a crucial influence on the model accuracy. This paper presents a method to construct a numerical model which can be used to perform the damage identification task on multi-layered flat bed weft-knitted fabrics (MKF) made of glass fibres and thermoplastic matrix. The proposed method especially considers the requirements of an online-diagnostic system based on operational vibrational data and impact-caused changes of the modal parameters. Impact experiments were conducted to systematically damage the investigated structures. The modal parameters of intact and damaged structures were experimentally obtained using a random vibration excitation. Adapted from the measured modal properties, an advanced mixed numerical experimental technique (MNET) was used to sequentially calibrate the numerical model of each intact and damaged structure. For this purpose, the elastic material properties as well as the damage-caused local geometry discrepancy are considered as variable model parameters. The response surface approximations are used to construct the inverse relations (identification functional) between the experimentally measured and numerically calculated modal parameters of structure. Damage parameters are obtained by minimizing the identification functional .


Atslēgas vārdi
3d-textile reinforced composite, damage identification, model fitting, inverse technique

Hufenbach, W., Höhne, R., Kostka, P., Langkamp, A., Ručevskis, S., Akišins, P. Experimental and Numerical Investigations of the Damage-Dependent Vibration Behaviour of Textile Reinforced Composite Structures. No: Proceedings of the International Conference on Structural Engineering Dynamics (ICEDyn 2013), Portugāle, Sesimbra, 17.-19. jūnijs, 2013. Lisbon: 2013, 1.-8.lpp.

Publikācijas valoda
English (en)
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