Abstract
Double-layered tubes consist of an inner tube and an outer tube. Both are similar in material, contact closely and deform simultaneously when subjected to external force. Hydroforming assembly technology has several advantages in the manufacturing of double-layered tubes. In this study, the hydroforming characteristics of double-layered tube are investigated. Free bulging tests are performed to produce formability diagrams of double-layered tubes at various forming pressures and feeding amounts. In addition, the hexagonal-shape hydroforming test is performed to estimate the dimensional accuracy of double-layered tubes through the corner filling ratio and the gap between the inner and outer tubes. Besides experimental analyses, an analytical model that can predict internal pressure for the hydroforming of double-layered tubes is proposed and experimentally validated in this study.
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