Abstract
Uncertainties during the manufacturing process or due to unexpected load variations in the course of operation can cause damages or faults in structures. These deviations from the original or intended properties can impact the durability and the application for the component. Destructive testing methods are often impractical since the investigated component becomes unfeasible. Instead, a non-destructive testing method, which is based on the change of the dynamic behaviour caused by the faults in the structures, allows examining the produced or built-in component. Experimental investigation of the changes can be employed to detect and quantify the damages to some extent, if the relationship between the properties and the damage is not known. The non-destructive vibrational testing methods, in particular, are based on the relation between the material properties of a structure and its measured vibrational behaviour, e.g. natural frequencies and mode shapes.
The structural responses of several FRC structures are investigated in this paper by using the experimental modal analysis. To measure the structural responses without changing the dynamical behaviour, a laser-scanning vibrometer is used. Two different sets of measurements are performed. In the lower frequency range a shaker is used for excitation. In the higher frequency range a loudspeaker is used as excitation with a microphone as phase reference. In order to extract the eigenfrequencies and modal data from the measurement, a modal analysis is performed afterwards. For identifying the changes in the natural frequencies and mode shapes, specimens without and with several different kinds of artificial faults are tested. The experimental results are compared with a finite element simulation of the structures. The advantages and merits of this method as well as its limits and drawbacks are discussed in this study.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsReferences
Gladwell, G.M.L.: The inverse problem for the vibrating beam. Proc. R. Soc. Lond. 393, 277–295 (1984)
Morassi, A.: A uniqueness result on crack location in vibrating rods. Inverse Probl. Eng. 4, 231–254 (1997)
Stache, M., Guettler, M., Marburg, S.: A precise non-destructive damage identification technique of long and slender structures based on modal data. J. Sound Vib. 365, 89–101 (2016)
Geweth, C.A., Sepahvand, K., Marburg, S.: Stochastic radiated sound power of structures with uncertain parameters. In: Proceedings of NOVEM (2015)
Sepahvand, K., Marburg, S., Hardtke, H.-J.: Stochastic free vibration of orthotropic plates using generalized polynomial chaos expansion. J. Sound Vib. 331(1), 167–179 (2012)
Mook, G., Pohl, J., Michel, F.: Damage detection and characterization in smart CFRP composites. In: Proceedings of SPIE—The International Society for Optical Engineering, San Diego, pp. 120–128 (2002)
Cheikh, M.: Reanalysis of structures with modification of the stiffness, application to the modeling of damage in unidirectional composites. Comput. Struct. 78(5), 725–736 (2000)
Geweth, C.A., Saati Khosroshahi, F., Sepahvand, K., Kerkeling, C., Marburg, S.: Damage detection of fibre-reinforced composite structures using experimental modal analysis. In: Procedia Engineering, X International Conference on Structural Dynamics, EURODYN 2017(2017)
Langer, P., Sepahvand, K., Krause, M., Marburg, S.: Simple vibroacoustic systems—influence of uncertainties in simulation and experiment. In: Proceedings of NOVEM (2015)
Matthews, D., Sun, H., Saltmarsh, K., Wilkes, D., Munyard, A., Pan, J.: A detailed experimental modal analysis of a clamped circular plate. In: Proceedings of 43rd Internoise (2014)
Acknowledgments
The research on which this paper is based on the support of Honda R&D Europe (Germany), both financially and technically. We thank them for their interest in this topic, the supply with test specimens and their support of this research.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer International Publishing AG
About this paper
Cite this paper
Geweth, C.A., Saati Khosroshahi, F., Sepahvand, K., Kerkeling, C., Marburg, S. (2018). Damage Detection by Experimental Modal Analysis in Fiber-Reinforced Composites. In: Conte, J., Astroza, R., Benzoni, G., Feltrin, G., Loh, K., Moaveni, B. (eds) Experimental Vibration Analysis for Civil Structures. EVACES 2017. Lecture Notes in Civil Engineering , vol 5. Springer, Cham. https://doi.org/10.1007/978-3-319-67443-8_11
Download citation
DOI: https://doi.org/10.1007/978-3-319-67443-8_11
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-67442-1
Online ISBN: 978-3-319-67443-8
eBook Packages: EngineeringEngineering (R0)