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薛克敏,汪会干,解修明,严思梁,王路生,李萍.Ti55钛合金整体壁板电脉冲辅助压弯成形失稳研究[J].稀有金属材料与工程(英文),2021,50(5):1787~1794.[Xue kemin,Wang huigan,Xie xiuming,Yan siliang,Wang lusheng and Li ping.Study on Instability of Ti55 Titanium Alloy Monolithic Panel by Electric Pulse Assisted Bending[J].Rare Metal Materials and Engineering,2021,50(5):1787~1794.]
Study on Instability of Ti55 Titanium Alloy Monolithic Panel by Electric Pulse Assisted Bending
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Received:July 01, 2020  
DOI:
Key words: integral panel  electric assisted bending  finite element model  rib instability
Foundation item:装备预研领域基金(61409230408);航空科学基金(2017ZEP4003);金属精密热加工国防科技重点实验室开放基金(201901SY008601);国家自然科学基金(51975175)
Author NameAffiliation
Xue kemin,Wang huigan,Xie xiuming,Yan siliang,Wang lusheng and Li ping  
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Abstract:
      The high-temperature titanium alloy mesh rib panel is more efficient than the traditional aluminum alloy rib wall plate, but the titanium alloy monolithic wall plate is difficult to form at room temperature. The use of current electroplasticity effect and Joule heat effect can effectively reduce the forming load and increase the forming limit, and can effectively avoid the problem of serious oxidation oxidation of titanium alloy.In this paper, the electric-thermo-mechanical coupled finite element model of electric pulse assisted bending forming of Ti55 integral panel is established, and different forming process parameters and panel geometric parameters are simulated. The results show that 8A/mm2 current is applied at both ends of the wall plate For density, the temperature range of press forming is more suitable. As the height of the ribs increases, the degree of instability buckling becomes larger and larger. The smaller the critical load required when the ribs are unstable, the worse the stability of the ribs. The thickness of the web mainly affects the temperature of the ribs and thus the instability of the ribs. The greater the spacing of the transverse ribs of the overall wall panel, the worse the stability of the ribs and the more serious the buckling of the buckling.