Ring으로 補剛된 원형실린더 Shell의 應力解析

Abstract

有限要素法에 依하여 構造物의 挫屈解版을 할 때 必要한 幾何學的 剛性 matrix는 初期應力*의 項을 포함하게 된다. 이때, 기둥이나 平板의 경우에는 內線 또는 面內에서의 平衡條件에 依하여 쉽게 初期應力을 決定하여 정확한 幾何學的 剛性 maxtrix를 構成할 수 있으나, shell의 경우, 특히, 補剛된 shell의 경우에는 初期應力을 決定하는 것이 그다지 간단하지 않으며, 또한, 初期應力의 精度가 挫屈荷重의 精度에 크게 영향을 미치는 것으로 생각된다.

따라서, 本 論文에서는 有限要素法을 使用하여 ring으로 補剛된 圓形 실린더 shell에 대한 應力解析을 하여 그 結果를 挫屈解析에 利用할 수 있게 하였다.

In general, geometrical stiffness martix reguired to structural stability analysis contains the prebuckling stress terms.

Then, in case of columns or plates, pre-buckling stresses can be determined by mean of equlibrium conditions in line or plane and the geometrical stiffness matrix can be constructed exactly.

But, in case of shells, especially stiffened shells, it's not so easy to determine the pre-buckling stresses, and the accuracy of them is thought to be concerned with that of critical load.

In this paper, therefore, stress analysis of ring-stiffened cylindrical shell has been performed by means of the finite element method, and the results can be used to make the geometrical stiffness matrix.

In general, geometrical stiffness martix reguired to structural stability analysis contains the prebuckling stress terms.

Then, in case of columns or plates, pre-buckling stresses can be determined by mean of equlibrium conditions in line or plane and the geometrical stiffness matrix can be constructed exactly.

But, in case of shells, especially stiffened shells, it's not so easy to determine the pre-buckling stresses, and the accuracy of them is thought to be concerned with that of critical load.

In this paper, therefore, stress analysis of ring-stiffened cylindrical shell has been performed by means of the finite element method, and the results can be used to make the geometrical stiffness matrix.