Nonlinear large deformation problem of rectangular thin plates and its perturbation solution under cylindrical bending: transform from plate/membrane to beam/cable. (English) Zbl 1540.74087
Summary: The Föppl-von Kármán equations describing deformation of flexible thin plates are established on the basis of moderately large-deflection and small rotation angle. For many years, the equations have been regarded as a classical and effective model used for the analysis of flexible thin plate problems, and at the same time, this model has also been constantly evolving and improving. The improvements for the model, however, come mainly from properties of materials perspective, but seldom from the deformation of plate perspective. In this study, we revisit Föppl-von Kármán equations from the viewpoint of deformation concerning rotation angle. A new form for the classical equations without a small-rotation-angle assumption is derived, for the first time, by giving up the basic assumption that the sine function of the rotation angle equals to the first-order derivative of the corresponding displacement, thus improving the governing equations while enhancing the nonlinearity. The abandonment of the small-rotation-angle assumption reveals such a fact that the second-order derivative of displacement in classical equations originates from the curvature and twist of plates. Due to the complexity of the equations derived, its perturbation solution is obtained under cylindrical bending with two opposites fully fixed. Results indicate that via cylindrical bending, a two-dimensional plate or membrane problem is easily associated with a one-dimensional beam or cable problem. Results also show that the abandonment of the small-rotation-angle assumption will contribute to the free development of the deflection curve rotation of the plate, while at the same time, the deflection value will tend to decrease to agree with the deformation of the plate.
© 2022 Wiley-VCH GmbH.
© 2022 Wiley-VCH GmbH.
MSC:
| 74K20 | Plates |
| 74K10 | Rods (beams, columns, shafts, arches, rings, etc.) |
| 74G10 | Analytic approximation of solutions (perturbation methods, asymptotic methods, series, etc.) of equilibrium problems in solid mechanics |
Keywords:
Foeppl-von Kármán equations; compatibility equations; small rotation angle; large-deflection bendingReferences:
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