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橫向超聲隨焊控制鋁合金焊接熱裂紋傾向數(shù)值模擬研究
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國家自然科學(xué)基金 (51075158)；福建省自然科學(xué)基金（2012J01212）；廈門市科技計(jì)劃 (3502Z20133023)


Numerical Simulation of Transverse Ultrasonic for Controlling the Tendency of Welding Hot Cracking in Aluminum Welding
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    從力學(xué)角度出發(fā)，提出橫向超聲隨焊控制鋁合金焊接熱裂紋的新方法。討論了鋁合金焊接熱裂紋產(chǎn)生的條件，建立脆性溫度區(qū)間（BTR）金屬材料-力學(xué)性能匹配模型，采用彈塑性有限元方法對BTR區(qū)域金屬產(chǎn)生的擠壓塑性流變行為和應(yīng)變場變化進(jìn)行了分析。模擬結(jié)果表明，橫向超聲沖擊對BTR區(qū)金屬產(chǎn)生橫向壓縮塑性應(yīng)變，并依靠BTR區(qū)金屬的塑性變形把應(yīng)變傳遞到焊縫中心，隨著橫向超聲沖擊加載功率的增加，在焊縫中心處產(chǎn)生的擠壓應(yīng)變也隨之增大。通過實(shí)驗(yàn)測定實(shí)際情況下BTR區(qū)金屬的橫向壓縮塑性應(yīng)變值，實(shí)驗(yàn)結(jié)果與模擬結(jié)果吻合良好，進(jìn)一步證明了該方法的可靠性

    Abstract:

    A new method was presented from the view of mechanics to prevent welding hot cracking for aluminum alloy by employing transverse ultrasonic during welding. The mechanical condition of welding hot cracking was discussed. The material-mechanical properties matching model within brittle temperature region (BTR) metals was established and the plastic flow and the variation of the strain field in welds by transverse ultrasonic were analyzed numerically. The simulation results show that the transverse ultrasonic impact produces transverse compressive plastic strain in BTR metal, and the plastic deformation is transferred to the weld centre through the metal within BTR. With the ultrasonic load amplitude increasing, the compressive stress in weld centre increases. Experiment was carried out through the ultrasonic extrusion in BTR area. It is indicated that the simulation results and the experiment results are in good accordance, which proves the reliability of the new method

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周廣濤,江余東,方洪淵.橫向超聲隨焊控制鋁合金焊接熱裂紋傾向數(shù)值模擬研究[J].稀有金屬材料與工程,2015,44(6):1407~1412.[Zhou Guangtao, Jiang Yudong, Fang Hongyuan. Numerical Simulation of Transverse Ultrasonic for Controlling the Tendency of Welding Hot Cracking in Aluminum Welding[J]. Rare Metal Materials and Engineering,2015,44(6):1407~1412.]
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  • 收稿日期:2014-06-05
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  • 在線發(fā)布日期: 2016-01-04
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