DOASIS: A Computer Code for the Deformation Plastic, Orthotropic, Axisymmetric (and Plane) Solution of Inelastic Solids. Volume I. Finite Element Program. Theoretical and Programmers Manual.

摘要

The finite element (displacement) method is used to determine the displacements, (elastic, plastic, thermal) strains, stresses; effective strains and stress in axisymmetric, constant thickness and variable thickness plane solids, with different orthotropic, elastic-plastic, temperature dependent material properties in tension and compression including the effect of either initial strains or stresses. The mechanical loads can be surface normal or tangential pressures, concentrated point or line nodal point loads, interference fit displacement conditions or body force loads (acceleration or angular velocity). The continuous solid is replaced by a system of discrete finite elements having either triangular or quadrilateral cross sections. The solution of the continuous solid is reduced to the solution of a set of linear, algebraic simultaneous equations yielding the displacements, from which the strains and stresses are determined. The nodal point forces are calculated at nodal points where displacements are specified. Residual errors and force equilibrium are checked. The DOASIS computer program is described and sample problems are presented, and illustrating its use.