Closed-form plastic collapse loads of pipe bends under combined pressure and in-plane bending |
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Authors: | Yun-Jae Kim Chang-Sik Oh |
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Affiliation: | Korea University, Department of Mechanical Engineering, 1-5 Ka, Anam-Dong, Sungbuk-Ku, Seoul 136-701, Republic of Korea |
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Abstract: | Based on three-dimensional (3-D) FE limit analyses, this paper provides plastic limit, collapse and instability load solutions for pipe bends under combined pressure and in-plane bending. The plastic limit loads are determined from FE limit analyses based on elastic-perfectly-plastic materials using the small geometry change option, and the FE limit analyses using the large geometry change option provide plastic collapse loads (using the twice-elastic-slope method) and instability loads. For the bending mode, both closing bending and opening bending are considered, and a wide range of parameters related to the bend geometry is considered. Based on the FE results, closed-form approximations of plastic limit and collapse load solutions for pipe bends under combined pressure and bending are proposed. |
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Keywords: | Combined pressure and in-plane bending Collapse load Finite element limit analysis Instability load Large geometry change Limit load Small geometry change Pipe bend |
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