The elastic shear moduli of graphite/epoxy composite materials have been measured using thin walled tubes of different lay-ups. First a dynamic test was used in which shear moduli were derived from the measurement of the natural frequency of torsional vibrations. Next a static torsional test was performed. In both cases the results correlated very well with classical lamination theory. Dynamic moduli were found to be an average 10% higher than static moduli.
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References
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S.W. Tsai, and T.H. Hahn, Introduction to Composite Materials, Technomic Publishing Co., 1980.
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S. Timoshencko, D.H. Young, W. Weaver, Vibration Problems in Engineering, Wiley, 1974.
3.
M.D. Turner, Comparison of Static and Dynamic Test Method for Determining the Stiffness Properties of Graphite/Epoxy Laminates, M.I.T., Dept. of Aeronautics and Astronautics, S. M. Thesis, June 1979 .
