Abstract
The theoretical research on stress waves propagating in laminated composites has been reported by many authors. However, there has been little work on experimental studies of stress waves in those materials. This paper presents an experimental investigation on stress waves propagating parallel to the layers of a laminated composite. A sandwich laminated composite consisting of two aluminum facings and an epoxy core is used as a specimen. The stress wave in the specimen is observed by use of high-speed holographic interferometry with a pulsed laser. In order to obtain the relative fringe orders, the interference fringe pattern in the reconstructed image is treated as an image-processing system with a personal computer. For the calculation of the in-plane displacement, an approximate relative-fringe-order method is used. The in-plane displacements obtained at some sampling points on the surface are smoothed by using a spline function. Distributions of the in-plane displacement and the shear stress are then obtained quantitatively over the whole analyzed field.
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References
Bedford, A. andStern, M., “Toward a Diffusing Continuum Theory of Composite Materials,”J. Appl. Mech.,38 (1,8–14 (March 1971).
Hegemier, G.A., “A Continuum Mixture Theory of Wave Propagation in Laminated and Fiber Reinforced Composites,”Jnt. J. Solids Struct.,9 (3),395–414 (March 1973).
Hegemier, G.A. andBache, T.C., “A Continuum Theory for Wave Propagation in Laminated Composites/Case 2: Propagation Parallel to the Laminates,”J. Elasticity,3 (2),125–140 (1973).
Peck, J.C. andGurtman, G.A., “Dispersive Pulse Propagation Parallel to the Interfaces of a Laminated Composite,”J. Appl. Mech.,36 (3),479–484 (Sept. 1969).
Payton, R.G., “Dynamic Bond Stress in a Composite Structure Subjected to a Sudden Pressure Rise,”J. Appl. Mech.,32 (3),643–650 (Sept. 1965).
Achenbach, J.D. andReddy, D.P., “Note on Wave Propagation in Linearly Viscoelastic Media,”Zeitschrift für Angewandte Mathematik und Physik,18,141–144 (1967).
Hayashi, T., Arakawa, K. andMorimoto, Y., “Transient Wave Propagation in Elastic Laminated Composites,”Trans. Jap. Soc. Space Sci.,24 (63),26–38 (May 1981).
Hayashi, T., Ugo, R. andMorimoto, Y., “The Observation of Stress Wave in a Rectangular Bar Using the High-Speed Holographic Interferometry,”Photo-Elasticity in Japan,4 (1–2),8–14 (1982).
Duffy, D. andLee, T.C., “Measurement of Surface Strain by Means of Bonded Birefringent Strips,”Experimental Mechanics,1 (9),109–112 (1961).
Frasier, J.T. andRobinson, D.N., “The Measurement of Dynamic Strains Using Birefringent Strips,”J. Appl. Mech.,33 (1),173–181 (Mar. 1966).
Ennos, A.E., “Measurement of In-Plane Surface Strain by Hologram-Interferometry,” J. Sci. Instr., 731–734 (1961).
Aleksandrov, E.G. andBonch-Bruevich, A.M., “Investigation of Surface Strains by the Hologram Technique,”Sov. Phys.-Tech. Phys.,12,258–265 (1967).
Dhir, S.K. andSikora, J.P., “An Improved Method for Obtaining the General-displacement Field from a Holographic Interferogram,”Experimental Mechanics,12 (7),323–327 (July 1972).
de Boor, C., “A Practical Guide to Spline,”Springer-Verlag, New York (1978).
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Hayashi, T., Ugo, R. & Morimoto, Y. Experimental observation of stress waves propagating in laminated composites. Experimental Mechanics 26, 169–174 (1986). https://doi.org/10.1007/BF02320011
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DOI: https://doi.org/10.1007/BF02320011