A Three-Dimensional Parametric Cubic Discrete Element Program for the Analysis of Composite Structures,

摘要

The response of a solid elastic body with anisotropic properties to thermal and mechanical loading is a difficult analysis problem. This is particularly true when the geometry is irregular, as in attachment fittings, and when the body is heterogeneous, as in multilayer composite laminates. This report describes a new approach to modeling three-dimensional problems based on the construction of parametric cubic models for geometry, data and analysis variables. Implementation of this approach in a computer program (c.f. PATCHES-III User's Manual) has resulted in significant reductions in the engineering labor required to model three-dimensional composites and in the computational expense required for a given stress accuracy. A key ingredient in the present approach is elimination of the restriction to grid point modeling. This is made possible by the introduction of parametric cubic models for lines, surfaces and volumes.