Symmetric-iterative FE and BE coupling method for solving axisymmetric problems

In this paper the symmetric-iterative FE and BE coupling method is adopted to investigate axisymmetric elastic problems. In order to improve computational efficiency, all degrees of freedom related to the BE region, except those degrees of freedom associated with interface, are condensed. The symmetric part is assembled into the stiffness matrix of the FEM, but the antisymmetric part is taken as the corresponding influential load matrix. During the solution process of the FEM, the numerical iterations, which includes the influence of the antisymmetry of the condensed stiffness matrix, are being carried out until the convergent results are obtained. Numerical examples show that the present method has high accuracy.