Evaluation of Modulus of Rigidity By Dynamic Plate Shear Testing
Keywords:Modulus of rigidity, dynamic plate shear, wood-based panels, torsional vibration
AbstractThe modulus of rigidity of wood-based panels was measured by the dynamic plate shear method. This involves measuring the torsional vibration of free, square plates. The proposed equation to calculate modulus of rigidity was found to agree within ±5% of the experimentally determined values. The experimentally determined modulus of rigidity values were very close to moduli determined by other techniques.
Hearmon, R. F. S. 1958. The influence of shear and rotatory inertia on the free flexural vibration of wooden beams. Brit. J. Appl. Phys. 9:381-388.nHearmon, R. F. S. 1960. An introduction to applied anisotropic elasticity. Oxford University Press, London.nLeissa, A. W. 1968. Vibration of plates. NASA SP-160.nMindlin, R. D. 1951. Influence of rotatory inertia and shear on flexural motions of isotropic, elastic plates. J. Appl. Mech. 18:31-38.nNakao, T., and T. Okano. 1985. Vibrational properties of a wooden plate. Mokuzai Gakkaishi 31(10):793-800.nNakao, T., T. Okano, and I. Asano. 1984. Measurement of the anisotropic shear modulus by the torsional-vibration method for free-free wooden beams. Mokuzai Gakkaishi (J. Jpn. Wood. Res. Soc.) 30(11):877-885.nNakao, T., T. Okano, and I. Asano. 1985a. Measurement of orthotropic shear-modulus for wood at a high torsional vibration mode. Mokuzai Gakkaishi 31(6):435-439.nNakao, T., T. Okano, and I. Asano. 1985b. Theoretical and experimental analysis of flexural vibration of the viscoelastic Timoshenko beam. Trans. ASME J. Appl. Mech. 52(3):728-731.nOkuma, M. 1966. Studies on the mechanical properties of plywood. Mokuzai Gakkaishi 12(3):123-128.nTsuzuki, K., I. Asano, and C. Kato. 1972. Study on the buckling in pure compression of flat rectangular plywood plates with simply supported edges. Zairyo (J. Jpn. Material Sci.) 20(11):146-151.n
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