(中國(guó)科學(xué)院沈陽(yáng)自動(dòng)化研究所 機(jī)器人學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室，沈陽(yáng) 110016)
摘 要: 基于歐拉-拉格朗日耦合(CEL)方法，建立一個(gè)新的攪拌摩擦焊多場(chǎng)耦合計(jì)算模型，模擬焊接過(guò)程中焊縫區(qū)材料的塑性流動(dòng)與缺陷形成，并通過(guò)開(kāi)展攪拌摩擦焊試驗(yàn)，分別從溫度場(chǎng)、焊縫宏觀形貌、焊縫截面塑性應(yīng)變及焊接缺陷幾方面對(duì)模擬結(jié)果的準(zhǔn)確性進(jìn)行驗(yàn)證。結(jié)果表明：模擬溫度與實(shí)測(cè)數(shù)據(jù)吻合較好，最大誤差為23.4 ℃；焊縫宏觀形貌、焊縫截面塑性應(yīng)變區(qū)的形狀和尺寸均與實(shí)際焊縫吻合較好；模型能夠較準(zhǔn)確地預(yù)測(cè)焊縫內(nèi)部孔洞缺陷的形成，且缺陷產(chǎn)生的位置與實(shí)際位置相吻合，缺陷尺寸的模擬值略大于其實(shí)測(cè)值。
關(guān)鍵字: 攪拌摩擦焊；材料流動(dòng)；焊接缺陷；歐拉-拉格朗日耦合方法；數(shù)值模擬
（State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:A new multi-physics coupling numerical model for friction stir welding was established based on coupled Eulerian-Lagrangian (CEL) method. The model was utilized to simulate the material flow and defect formation in the weld during welding. The friction stir welding was conducted to verify the model through the comparison of temperature field, macro morphology of weld, plastic strain in the weld and welding defect. The results show that the simulation temperatures agree well with the measured data and the maximum error is 23.4 ℃. The macro morphology of the weld, the plastic strain zone shape and size on the weld cross-section are in good agreement with the actual weld. The model can accurately predict the formation of void defect in the weld, and the simulated void position is consistent with the actual position. But the void size is overestimated slightly.
Key words: friction stir welding; material flow; welding defect; coupled Eulerian-Lagrangian method; numerical simulation
