When dynamic properties of structures in vibration are considered, their elastic modulus and damping properties are emphasized. One of the best ways for true measurement of damping is the use of a beam with free—free end conditions. The aim of this study is to investigate dynamic properties of composites by using the vibrating beam technique. The composite specimens with free—free end conditions were vibrated at their fundamental nodes. An electro-magnetic shaker was used to vibrate the specimens by means of air flow and their responses were taken by means of a microphone, a non-contact mechanism. It has been shown that this technique produces accurate and repeatable results and that this is a reliable method for the dynamic measurements.
Kadioglu, F. (2000). Ph.D. Thesis, Department of Mechanical Engineering, University of Bristol.
2.
Adams, R.D. and Maheri, M.R. (1994). Dynamic Flexural Properties of Anisotropic Fibrous , Composite Beams Composites Science and Tech., 50: 497-514.
3.
Singh, M.M. (1993). Ph.D. Thesis, Department of Mechanical Engineering, University of Bristol.
4.
Finegan, I.C. and Gibson, R.F. (1999). Recent Research on Enhancement of Damping in Polymer Composites, Composite Structures , 44: 89-98.
5.
Hwang, S.J. and Gibson, R.F. (1992). The Use of Strain Energy-based Finite Element Techniques in the Analysis of Various Aspects of Damping of Composite Materials and Structures, Journal of Composite Materials, 26: 2585-2605.
Adams, R.D. and Bacon, D.G. (1973). Measurement of the Flexural Damping Capacity and Damping Young's Modulus of Metal and Reinforced Plastics, Journal of Physics D: Applied Physics, 6: 27-41.
8.
Suarez, S.A., Gibson, R.F., Sun, C.T. and Chaturvedi, S.K. (1986). The Influence of Fiber Length and Fiber Orientation on Damping and Stiffness of Polymer Composite Materials, Experimental Mechanics, 26: 175-184.
9.
Hwang, S.J. and Gibson, R.F. (1993). Prediction of Fiber - Matrix Interphase Effects on Damping of Composites Using a Micromechanical Strain Energy/Finite Element Approach, Composites Engineering, 3: 975-984.
10.
Dong, S. and Gauvin, R. (1993). Application of Dynamic Mechanical Analysis for the Study of the Interfacial Region in Carbon Fiber/Epoxy Composite Materials , Polymer Composites, 14: 414-420.
11.
Gibson, R.F. (1992). Damping Characteristics of Composite Materials and Structures, Journal of Materials Engineering and Performance , 1: 11-20.
12.
Dewa, H., Okada, Y. and Nagai, B. (1991). Damping Characteristics of Flexural Vibration for Partially Covered Beams with Constrained Viscoelastic Layers, JSME International Journal, Series III, 34(2): 210-217.
13.
Rao, M.D. and Crocker, M.J. (1990). Vibrations of Bonded Beams with a Single Lap Adhesive Joint, Journal of Sound and Vibration, 92(2): 299-309.
14.
Park, T.H. (1997). Vibration and Damping Characteristics of a Beam with a ppartially Sandwiched Viscoelastic Layer, Journal of Adhesion, 61(1-4): 97-122.
15.
Douglas, B.E. and Yang, J.C.S. (1978). Transverse Compressional Damping in the Vibratory Response of Elastic-Viscoelastic Beams, AIAA Journal, 16(9): 925-930.
16.
Qian, G.L., Hoa, S.V. and Xiao, X. (1997). A Vibration Method for Measuring Mechanical Properties of Composite, Theory and Experiment, Composite Structures , 39: 31-38.
17.
Guild, F.J. and Adams, R.D. (1981). A New Technique for the Measurement of the Specific Damping Capacity of Beam in Flexure, J. Physics E: Sci. Instrum., 14: 355-363.
18.
Graessner, E.J. and Wong, C.R. (1992). M3D: Mechanics and Mechanisms of Material Damping, ASTM STP, 1169: 316-343.
19.
Thomson, W.T. (1993). Theory of Vibration with Applications, 4th edn, Chapman & Hall, London.
20.
Adams, R.D. and Bacon, D.G.C. (1973). Measurement of the Flexural Damping Capacity and Dynamic Young's Modulus of Metals and Reinforced Plastics, J. Physics D: Applied Physics, 6: 27-41.
