The influence of length–diameter ratio in forming area on viscous outer pressure forming and limit diameter reduction

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• 作者：Tiejun Gao ; Hepeng Zhang ; Yang Liu…
• 关键词：Viscous outer pressure ; Tube blank ; Deformation mode ; Extension deformation
• 刊名：Journal of the Brazilian Society of Mechanical Sciences and Engineering
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：39
• 期：2
• 页码：481-486
• 全文大小：
• 刊物主题：Mechanical Engineering;
• 出版者：Springer Berlin Heidelberg
• ISSN：1806-3691
• 卷排序：39

文摘

This paper introduces a forming method on viscous outer pressure of thin-walled tubes, and the forming process under constraint at tube-blank end is analyzed. In this work, the influences of stress and strain of tube blank and length–diameter ratio in forming area on the deformation mode and limit diameter reduction are obtained, and are also validated by experiment and numerical simulation methods. The results show that under the tube-blank end constraint, the deformation can be divided into three areas, namely the area where the tube-blank surface area decreases continuously (area A), the area where the tube-blank surface area decreases first and then increase (area B) and the area where the tube-blank surface area increase (area C). In area B and C, the diameter reduction can be remarkably improved if the viscous pressure restrains the wrinkles growing within the critical forming amount and changes the deformation mode from compression type to extension type.