(1. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001；
2. 中國(guó)運(yùn)載火箭技術(shù)研究院，北京 100076)
摘 要: 為了研究拉伸成形2219鋁合金薄壁曲面件的變形與強(qiáng)度分布規(guī)律，通過網(wǎng)格應(yīng)變法和單向拉伸試驗(yàn)對(duì)曲面件各個(gè)區(qū)域的應(yīng)變與力學(xué)性能進(jìn)行測(cè)試，得到全域范圍內(nèi)的變形與強(qiáng)度分布規(guī)律。結(jié)果表明：等效應(yīng)變分布在1%~15%范圍，但瓜瓣曲面件有效區(qū)域的等效應(yīng)變?cè)?%~12%，變形較為均勻；屈服強(qiáng)度為312.8~346.9 MPa，抗拉強(qiáng)度為421~442.2 MPa；強(qiáng)度與變形量之間成正比例關(guān)系，抗拉強(qiáng)度和硬度皆隨變形量增加而增大。所有測(cè)試數(shù)據(jù)表明拉伸成形的2219鋁合金薄壁曲面件滿足火箭燃料貯箱箱底的力學(xué)性能要求。
關(guān)鍵字: 2219鋁合金；拉伸成形；瓜瓣?duì)钋婕蛔冃危粡?qiáng)度
（1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. Capital Aerospace Machinery Company, Beijing 100076, China）
Abstract:In order to investigate the deformation and strength distribution of thin-walled 2219 aluminum alloy curved parts in stretch forming, grid strain analysis and uniaxial tensile tests were used to test the strain and mechanical properties of the curved part in every sub-region. Then the deformation and strength distribution in the whole area were obtained. The results show that the equivalent strain ranges from 1% to 15% in the whole area, but the equivalent strain in the effective central zone of the curved part ranges from 7% to 12%, which is relatively uniform deformation. Moreover, the yield strength in the effective central zone ranges from 312.8 to 346.9 MPa, while the tensile strength ranges from 421 to 442.2 MPa. The strength is directly proportional to the amount of deformation, and both the tensile strength and hardness increase with the increase of deformation. All the testing data of the gore show greater than expected mechanical properties of the stretch formed 2219 aluminum alloy curved parts used for dome of rocket tank.
Key words: 2219 aluminum alloy; stretch forming; petal parts; deformation; strength
