Transactions of Materials and Heat Treatment

Title：Experimental investigation on electrohydraulic forming of aluminum alloy tube

Authors： Yu Haiping Sun Lichao Zhang Xu Li Chunfeng

Unit： Harbin Institute of Technology Machinery Manufacturing Company Shanghai Baosteel Industry Technological Service Co. Ltd.

KeyWords： electrohydraulic forming aluminum alloy tube wall thickness discharge voltage wire diameter

ClassificationCode：TG391

year,vol(issue):pagenumber：2016,41(3):37-43

Abstract：

Electrohydraulic forming (EHF) is a high-rate plastic deformation technology, which makes the sheet metal to form at a high speed by the shockwave generated from high voltage discharge under water. The experimental investigation on EHF of aluminum alloy 5A02 tube was performed by the cylindrical die, and the influences of discharge voltage and wire diameter on EHF were analyzed. Furthermore, the experiments of two-step EHF process were explored to avoid inadequate deformation in the corner by one-step process. The results show that the deformation increases with the rise of high voltage, and there is a critical wire diameter corresponding to the maximum deformation under a constant discharge voltage. The critical wire diameter increases with the rise of voltage. The deformed tube is in a biaxial tension strain state after EHF. However, the middle of deformation zone reaches a plane strain state, and the region near the inner corner of the deformation zone is close to a biaxial equal tension strain state. In contrast to the filleted corner caused by one-step EHF process, the one by two-step is in the almost full attaching-die condition and the thickness of deformed tube wall is relatively uniform.

Funds：

国家自然科学基金资助项目(51475122)；国家重点基础研究计划资助项目课题(2011CB012805)；中央高校基本科研业务费专项资金资助项目（HIT.NSRIF.12006）

于海平（1974-），男，博士，副教授,博士生导师

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