Object oriented design of a thermo-mechanical FEM code

摘要

An object oriented design is presented for a computer program that can performudthermo-mechanically coupled analyzes. The target of the design is a udexible and robustudcomputer program. It should be easy to adapt and extend, re-using existing code, withoutudinterfering with already established algorithms.udThe program uses publicly available toolkits that are currently emerging as C++ pack-udages. First of all the Standard C++ Library (formerly Standard Template Library) isudused for packing items in container classes. Secondly the matrix and vector operationsudare derived from the Template Numerical Toolkit (TNT) and �nally (not essentially forudthe numerical part) a graphical user interface is made, based on the wxWindows package,udthat can generate a GUI for Motif and MS-Windows with the same code.udAttention is given to the design of classes such as speci�c elements and material classesudbased on more general classes. A hierarchy of classes is constructed where general behaviorudis put high in the hierarchy and speci�c behavior low. The choice between inheritance andudaggregation is made at several levels.