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.
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。
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On the base of the general theory of thin-walled members, we deduce a new critical moment formula of steel beam under transverse loads which pass the shear center and parallel to the main axis.
This paper makes the optimum autofrettage analysis of thick-walled cylinder of the material with different yield strength in tension and compression base on the Mohr's yield criterion.