R-Function and variation method for bending problem of clamped thin plate with complex shape

• Published in: Advances in mechanical engineering Vol. 13; no. 7; p. 168781402110348
• Main Authors: Xia, Fengfei, Li, Shanqing
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.07.2021; Sage Publications Ltd; SAGE Publishing
• Subjects: Bending; Boundary conditions; Exact solutions; Finite element method; Flow control; Numerical methods; Thin plates; thin plate bending; Complex shape; variational method; R-function; trial function
• ISSN: 1687-8132; 1687-8140; 1687-8140
• DOI: 10.1177/16878140211034832

Solving ordinary thin plate bending problem in engineering, only a few analytical solutions with simple boundary shapes have been proposed. When using numerical methods (e.g. the variational method) to solve the problem, the trial functions can be found only it exhibits a simple boundary shape. The R-functions can be applied to solve the problem with complex boundary shapes. In the paper, the R-function theory is combined with the variational method to study the thin plate bending problem with the complex boundary shape. The paper employs the R-function theory to express the complex area as the implicit function, so it is easily to build the trial function of the complex shape thin plate, which satisfies with the complex boundary conditions. The variational principle and the R-function theory are introduced, and the variational equation of thin plate bending problem is derived. The feasibility and correctness of this method are verified by five numerical examples of rectangular, I-shaped, T-shaped, U-shaped, and L-shaped thin plates, and the results of this method are compared with that of other literatures and ANSYS finite element method (FEM). The results of the method show a good agreement with the calculation results of literatures and FEM.