Experimental Determinations of the Eigenmodes for Sandwich Bars with Different Core Reinforced with Metal Fabric

Abstract:

In this paper, starting from the theoretical background of modal identification, it is established an experimental method used to determine the eigenmodes of some composite bars with the core made of polypropylene honeycomb and polystyrene reinforced with metal fabric. The single-point excitation method is used. This method has been widely used in modal tests and it consists in applying a force in a given point and recording the vibratory structure response in all interest points, including the excitation point. Although the single-point excitation requires a minimum of equipment, it needs a laborious analysis to perform extensive result processing in order to interpret the dynamic behaviour of the structure under test.

• Periodical: Applied Mechanics and Materials (Volume 658)
• Pages: 255-260
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.658.255
• Online since: October 2014
• Authors: Cosmin Mihai Miriţoiu*, Dumitru Bolcu, Marius Marinel Stănescu, Vilcu Rosca
• Keywords: Eigenmodes, Metal Fabric, Sandwich Bars, Vibration

References

[1] P.C. Yang, C.H. Norris, Y. Stavsky, Elastic Wave Propagation in Heterogeneous Plates, Int. Jour. Solids. Struct., 2 (1965), 664-684.

[2] J.M. Whitney, N.Y. Pagano, Shear Deformation in Heterogeneous Anisotropic Plates, Jour. Appl. Mech., 37 (1970), 1031-1036.

DOI: 10.1115/1.3408654

[3] J.N. Reddy, A Review of Refined Theories of Laminated Composites Plates, Shock and Vibration, 22 (1990), 3-17.

[4] A. Noiser, R.K. Kapania, J.N. Reddy, Free vibration analysis of laminated plates using a Lay-Wise Theory, American Institute of Aeronautic and Astronautics Journal, 31 (1993), 2335-2346.

DOI: 10.2514/3.11933

[5] V.N. Paimushin, I.M. Zakirov, et. al., Average Elastic and Strength Characteristics of a Honeycomb Core and a Theoretical-Experimental Method of their Determination, Mechanics of Composite Materials, 48 (2012), 511-524.

DOI: 10.1007/s11029-012-9296-0

[6] N.I. Akishev, I.I. Zakirov, et. al., Theoretical-Experimental Method for Determining the Averaged Elastic and Strength Characteristics of a Honeycomb Core of Sandwich Designs, Mechanics of Composite Materials, 47 (2011), 377-386.

DOI: 10.1007/s11029-011-9216-8

[7] M.S. Konsta-Gdoutos, E.E. Gdoutos, The Effect of Load and Geometry of the Failure Modes of Sandwich Beams, Applied Composite Materials, 12 (2005), 165-176.

DOI: 10.1007/s10443-005-1120-8

[8] V.E. Kryutchenko, Elastic Properties of Honeycomb Sandwich Plates with Non-traditional Cell Forms, Mechanics of Composite Materials, 33 (1997), 132-135.

DOI: 10.1007/bf02269599

[9] D.J. Edwins, Modal Testing. Theory and Practice, Bruel&Kjaer (1987).

[10] M.M. Stanescu, D. Bolcu, I. Manea, et. Al., Experimental Researches Concerning the Properties of Composite Materials with Random Distribution of Reinforcement, Materiale Plastice, 46: 1 (2009), 73-78.

[11] I. Manea, D. Bolcu, C. Miritoiu, Software for mechanical systems modal identification, Annals of the University of Craiova. Mechanical Series, 1 (2007), 191-199.

[12] C. Miritoiu, D. Ilincioiu, et. al., A Comparison Between the Modal Parameters Obtained by two Different Accelerometers, The 5TH International Conference on Manufacturing Science and Education – MSE 2011, 1 (2011), 39-43.