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A nonlinear composite beam theory

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Abstract

Presented here is a general theory for the three-dimensional nonlinear dynamics of elastic anisotropic initially straight beams undergoing moderate displacements and rotations. The theory fully accounts for geometric nonlinearities (large rotations and displacements) by using local stress and strain measures and an exact coordinate transformation, which result in nonlinear curvature and strain-displacement expressions that contain the von Karman strains as a special case. Extensionality is included in the formulation, and transverse shear deformations are accounted for by using a third-order theory. Six third-order nonlinear partial-differential equations are derived for describing one extension, two bending, one torsion, and two shearing vibrations of composite beams. They show that laminated beams display linear elastic and nonlinear geometric couplings among all motions. The theory contains, as special cases, the Euler-Bernoulli theory, Timoshenko's beam theory, the third-order shear theory, and the von Karman type nonlinear theory.

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Authors and Affiliations

  1. Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, 24061, Blacksburg, VA, U.S.A.

    Perngjin F. Pai & Ali H. Nayfeh

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  1. Perngjin F. Pai
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  2. Ali H. Nayfeh
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Pai, P.F., Nayfeh, A.H. A nonlinear composite beam theory. Nonlinear Dyn 3, 273–303 (1992). https://doi.org/10.1007/BF00045486

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  • DOI: https://doi.org/10.1007/BF00045486

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