本文将开口和闭口薄壁理论统一在乌曼斯基假设之下，建立开口和闭口薄壁杆件统一的基本微分方程序。
In this paper, on the base of Ullmanski's hypothesis, the unified beam theory of thin walled open and closed cross-section and the governing differential equations are established.
基于乌曼斯基薄壁杆件约束扭转理论，利用刚性周边假定建立了闭口薄壁杆件约束扭转分析的一维离散有限元方法。
Taking the effects of geometrical nonlinearity into account, a general theory of composite thin walled bar is established under the combinational deformation of tension, compression and torsion.
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