(1. 中南大學(xué) 機(jī)電工程學(xué)院，長(zhǎng)沙 410083；
2. 中南大學(xué) 高性能復(fù)雜制造國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 基于鋁合金時(shí)效成形機(jī)理的蠕變統(tǒng)一本構(gòu)方程，應(yīng)用大型商業(yè)化有限元軟件MSC.Marc，對(duì)其進(jìn)行二次開(kāi)發(fā)，實(shí)現(xiàn)7055鋁合金加筋板蠕變時(shí)效成形過(guò)程仿真模擬，結(jié)合ATOS Professional軟件分析加筋板成形后回彈率，并通過(guò)實(shí)驗(yàn)研究驗(yàn)證仿真結(jié)果的正確性。結(jié)果表明：?jiǎn)渭冹o力加載后加筋板的回彈量為16.14%，而經(jīng)過(guò)蠕變時(shí)效后加筋板的回彈量降低為10.34%，筋條對(duì)構(gòu)件蒙皮的回彈起到一定的抑制作用；蠕變時(shí)效后加筋板的幾何形狀是由筋板的塑性變形與構(gòu)件的蠕變應(yīng)變共同決定的。
關(guān)鍵字: 7055鋁合金；蠕變時(shí)效成形；有限元仿真；回彈
（1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of High Performance Complex Manufacturing, Central South University,
Changsha 410083, China）
Abstract:The creep unified constitutive equations based on aluminum alloy aging forming mechanism were further developed by the large scale commercial finite element software MSC.Marc, and 7055 aluminum alloy stiffened panel creep age forming process simulations were completely conducted. Then springback of the stiffened plate after forming was calculated by ATOS Professional software, and its correctness was verified by experimental studies. The results show that, the springback of the stiffened plate under the simple static load is 16.14%, while it reduces to 10.34% after creep age forming, which shows that ribs play some certain role on the springback of the skin in the process of creep age forming. And the geometry shape of the stiffened plate after creep age forming is jointly determined by the plastic deformation of the ribs and the creep strain of the workpiece.
Key words: aluminum alloy 7055; creep age forming; finite element simulation; springback
