Characterization of Adhesive Layers in Sandwich Composites by Nondestructive Technique

Authors: E. Barkanov, E. Skukis, M. Wesolowski, A. Chate

Abstract:

New nondestructive technique, namely an inverse technique based on vibration tests, to characterize nonlinear mechanical properties of adhesive layers in sandwich composites is developed. An adhesive layer is described as a viscoelastic isotropic material with storage and loss moduli which are both frequency dependent values in wide frequency range. An optimization based on the planning of experiments and response surface technique to minimize the error functional is applied to decrease considerably the computational expenses. The developed identification technique has been tested on aluminum panels and successfully applied to characterize viscoelastic material properties of 3M damping polymer ISD-112 used as a core material in sandwich panels.

Keywords: Adhesive layer, finite element method, inverse technique, sandwich panel, vibration test, viscoelastic material properties.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1062720

References:

[1] J. De Visscher, H. Sol, W. P. De Wilde, and J. Vantomme, "Identification of the damping properties of orthotropic composite materials using a mixed numerical experimental method," Applied Composite Materials, vol. 4, pp. 13-33, 1997.
[2] B. Gommers, I. Verpoest, and P. Van Houtte, "Determination of the mechanical properties of composite materials by tensile tests. Part I: Elastic properties," Journal of Composite Materials, vol. 32, no. 4, pp. 310-334, 1998.
[3] S. Mistou, and M. Karama, "Determination of the elastic properties of composite materials by tensile testing and ultrasound measurement," Journal of Composite Materials, vol. 34, no. 20, pp. 1696-1709, 2000.
[4] T. Lekszycki, N. Olhoff, and J. J. Pedersen, "Modeling and identification of viscoelastic properties of vibrating sandwich beams," Composite Structures, vol. 22, pp. 15-31, 1992.
[5] T. Saito, R. D. Parbery, S. Okuno, and S. Kawano, "Parameter identification for a aluminum honeycomb sandwich panels based on orthotropic Timoshenko beam theory," Journal of Sound and Vibration, vol. 208, no. 2, pp. 271-287, 1997.
[6] Y. Shi, H. Sol, and H. Hua, "Material parameter identification of sandwich beams by an inverse method," Journal of Sound and Vibration, vol. 290, pp. 1234-1255, 2006.
[7] R. Rikards, "Elaboration of optimal design models for objects from data of experiments," in Proceeding of the IUTAM symposium, Amsterdam: Elsevier Science Publishers, 1992, pp. 148-162.
[8] R. Rikards, A. Chate, and E. Barkanov, "Finite element analysis of damping the vibrations of laminated composites," Computers and Structures, vol. 47, pp. 1005-1015, 1993.
[9] A. D. Nashif, D. I. G. Johnes, and J. P. Hendersen, Vibration Damping. New York, Chichester, Brisbane, Toronto, Singapore: John Wiley & Sons, 1985.
[10] E. N. Barkanov, "Method of complex eigenvalues for studying the damping properties of sandwich type structures," Mechanics of Composite Materials, no. 1, pp. 90-94, 1993.
[11] A. Janushevskis, T. Akinfiev, J. Auzins, and A. Boyko, "A comparative analysis of global search procedures," Proc. Estonian Acad. Sci. Eng., vol. 10, no. 4, pp. 236-250, 2004.
[12] http://www.polytec.com.