๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Symbolic software tools in the development of finite elements

โœ Scribed by Anders Eriksson; Costin Pacoste


Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
300 KB
Volume
72
Category
Article
ISSN
0045-7949

No coin nor oath required. For personal study only.

โœฆ Synopsis


Symbolic software has been used in a number of projects concerned with the development of ยฎnite element procedures, primarily aiming at complex, i.e. interacting and higher order instabilities, where high accuracy in formulations is required.The symbolic tools improve the eciency and documentation of the developed procedures, in order to facilitate comparisons between dierent element assumptions. Beam formulations for plane and space models were developed, in total displacement and co-rotational contexts, respectively. Symbolic derivation allowed analytical veriยฎcation of equivalence between certain formulations within these two contexts. Treatment of ยฎnite space rotations, based on the rotational vector makes the history-less treatment of rotations easier, which is needed in the evaluation of critical equilibrium subsets in higher-dimensional parameter space. A co-rotational viewpoint, where local element displacements can be obtained from global variables in a systematic manner, allowed dierent element expressions in a common framework. Dierent simple, linear elements have been tested with respect to computational eciency. A ยฎeld consistence approach was used to develop highly accurate beam and plane stress elements. The common element formulations, based on the matrix multiplication B T DB, is often inecient, due to the large number of operations needed in the matrix product. Other formulations, based on an analytical integration and dierentiation of the strain energy, producing explicit expressions for the stiness terms, were considerably more ecient for certain elements.


๐Ÿ“œ SIMILAR VOLUMES


An object-oriented hybrid symbolic/numer
โœ Dominique Eyheramendy ๐Ÿ“‚ Article ๐Ÿ“… 2000 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 767 KB

The association of object-oriented programming and symbolic computation techniques introduces certain changes in "nite element code organization. The purpose of this approach is to speed up the design of new formulations. Previous papers have described the basic concepts of the method. In this paper