有限要素法の特性を考慮したポスト処理による応力解の高精度化に関する研究

概要

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Finite element method is wildly used for evaluating the strength of structures designed by engineers. It is desired to reduce the numbers of elements and nodal points, since there are several limitations existing in creating finite element models and in executing computer programs. However, enough accuracy is not obtained in finite element analysis for evaluating the strength of structures when too much reduction is performed in finite element modeling. This poor solution may produce several structure problems. Finite element method translates the mechanical behavior of a continuous material into a desecrated system, hence; several characteristics of the continuous material are lost. However, if some information for them is utilized properly, it is possible to recover the lost behavior and to modify the stress solution with reasonable accuracy. In this paper, ship structure is considered especially at the double bottom part where stresses of the plate are connected with longitudinal stiffeners. Stresses are classified into two groups, local deformation and global deformation, and the stresses due to local deformation are modified according to database. The validity of the proposed method is also examined.
社団法人日本船舶海洋工学会の論文
2004-08-31