TC4钛合金薄板激光焊接变形的有限元模拟
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摘要
建立了TC4钛合金薄板激光焊接模型,采用有限元方法分析了板宽对焊接残余应力及失稳变形的影响。结果表明:最高纵向残余拉应力出现在焊缝中心两侧的热影响区;随着板度增大,平均残余压应力和临界失稳力降低;沿着焊接方向的钛合金薄板失稳变形程度随板宽的增加而减小,而垂直于焊接方向的失稳变形程度随板宽的增加而增大;当板宽为120mm时,其失稳变形程度呈马鞍形分布,当板宽为320mm时,马鞍形变形分布特征消失;钛合金薄板失稳变形的z向位移试验值与模拟结果的相对误差为8%,证明模拟结果较准确。
Model for laser welding of TC4 titanium alloy thin sheet was established.The effects of sheet width on welding residual stress and instability deformation of titanium alloy sheet were analyzed by finite element method.The results show that the maximum longitudinal residual tensile stress appeared in the heat affected zone on both sides of the weld center.With the increase of sheet width,the average residual compressive stress and critical instability force decreased.The instability deformation thin of the titanium alloy degree sheet along the welding direction decreased with the increase of sheet width,while that perpendicular to the welding direction increased with sheet width increasing. When the sheet width was 120 mm,The distribution of instability deformation degree of the sheet was saddle-shaped.When the sheet width was 320 mm,the saddle-shaped deformation distribution characteristic disappeared.The relative error between the experimental value of z-direction displacement and the simulation of the instability deformation of titanium alloy thin sheet was 8%,indicating that the simulation was relatively accurate.
Model for laser welding of TC4 titanium alloy thin sheet was established.The effects of sheet width on welding residual stress and instability deformation of titanium alloy sheet were analyzed by finite element method.The results show that the maximum longitudinal residual tensile stress appeared in the heat affected zone on both sides of the weld center.With the increase of sheet width,the average residual compressive stress and critical instability force decreased.The instability deformation thin of the titanium alloy degree sheet along the welding direction decreased with the increase of sheet width,while that perpendicular to the welding direction increased with sheet width increasing. When the sheet width was 120 mm,The distribution of instability deformation degree of the sheet was saddle-shaped.When the sheet width was 320 mm,the saddle-shaped deformation distribution characteristic disappeared.The relative error between the experimental value of z-direction displacement and the simulation of the instability deformation of titanium alloy thin sheet was 8%,indicating that the simulation was relatively accurate.
引文
[1]郭鲤,詹浩,游玉萍,等.钛及钛合金粉末注射成形的研究进展[J].机械工程材料,2018,42(6):15-21.
[2]徐祥,耿鲁阳,巩建鸣.TC4钛合金的高温氧化动力学行为[J].机械工程材料,2018,42(9):33-36.
[3]龚宗辉,谢兰生,陈明和,等.新型TA32钛合金板的高温拉伸变形行为[J].机械工程材料,2019,43(1):69-74.
[4]CHEN G Q,SHI Q Y,FUJIYA Y,et al.Simulation of metal flow during friction stir welding based on the model of interactive force between tool and material[J].Journal of Materials Engineering and Performance,2014,23(4):1321-1328.
[5]何小东,张建勋,巩水利,等.TC4钛合金激光焊接应力变形有限元分析[J].材料工程,2005,33(8):39-42.
[6]何小东,张建勋,裴怡,等.钛合金薄板激光焊接和TIG焊接残余应力数值模拟[J].机械工程材料,2005,29(3):25-28.
[7]李菊,关桥,郭德伦,等.钛合金焊接应力应变的数值模拟[J].焊接,2010,2(3):14-17.
[8]吴新强.TC4钛合金电子束焊接数值模拟及接头组织与性能[D].南京:南京航空航天大学,2011.
[9]张华,周广涛,王霏.健身自行车架焊接顺序优化的数值模拟[J].机械工程材料,2016,40(4):38-42.
[10]拉达伊.焊接热效应温度场、残余应力、变形[M].北京:机械工业出版社,1997.
[11]王立鹏.超声波激振随焊控制铝合金焊接应力及变形的应力应变演变研究[D].厦门:华侨大学,2015.
[2]徐祥,耿鲁阳,巩建鸣.TC4钛合金的高温氧化动力学行为[J].机械工程材料,2018,42(9):33-36.
[3]龚宗辉,谢兰生,陈明和,等.新型TA32钛合金板的高温拉伸变形行为[J].机械工程材料,2019,43(1):69-74.
[4]CHEN G Q,SHI Q Y,FUJIYA Y,et al.Simulation of metal flow during friction stir welding based on the model of interactive force between tool and material[J].Journal of Materials Engineering and Performance,2014,23(4):1321-1328.
[5]何小东,张建勋,巩水利,等.TC4钛合金激光焊接应力变形有限元分析[J].材料工程,2005,33(8):39-42.
[6]何小东,张建勋,裴怡,等.钛合金薄板激光焊接和TIG焊接残余应力数值模拟[J].机械工程材料,2005,29(3):25-28.
[7]李菊,关桥,郭德伦,等.钛合金焊接应力应变的数值模拟[J].焊接,2010,2(3):14-17.
[8]吴新强.TC4钛合金电子束焊接数值模拟及接头组织与性能[D].南京:南京航空航天大学,2011.
[9]张华,周广涛,王霏.健身自行车架焊接顺序优化的数值模拟[J].机械工程材料,2016,40(4):38-42.
[10]拉达伊.焊接热效应温度场、残余应力、变形[M].北京:机械工业出版社,1997.
[11]王立鹏.超声波激振随焊控制铝合金焊接应力及变形的应力应变演变研究[D].厦门:华侨大学,2015.