| Citation: | KONG Deshuai, LANG Lihui, RUAN Shangwenet al. Deformation behavior of a bent tube based on free expansion[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(7): 1395-1402. doi: 10.13700/j.bh.1001-5965.2016.0525(in Chinese)
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As the development of lightweight design in manufacture industry, the application of thin-walled bent hollow tubes with various sections is expanding widely. In order to study the deformation behavior of bent tubes during hydroforming process and have a reliable process design, a theoretical model of free-expansion bent tubes based on membrane theory and plastic theory was put forward, and the model was verified by finite element (FE) analysis. The FE analysis results show good agreement with the theoretical model. The stresses distribution and deformation behavior were revealed. Finally, the work-hardening behavior during rotary draw bending was analyzed, and meanwhile, the fracture site of pre-bent tubes with different work-hardening states during free-expansion process was explored. The experimental results show good agreement with the FE analysis results.
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