脉冲放电对焊接接头的强化分析
|
摘要
对含有裂纹的16Mn焊接接头脉冲放电后的拉伸过程进行了数值模拟,分析了脉冲放电强化对裂纹前缘应力状态的影响.数值分析表明,经脉冲放电强化后,焊接接头受拉时裂纹前缘处的应力集中降低,抗拉性能得到了提高;对含有裂纹的16Mn焊接接头试件进行脉冲放电和拉伸性能试验.结果表明,通过脉冲放电强化,裂纹前缘钝化并产生了硬而韧的白亮层组织,试件的断口变得均匀、拉伸性能平均提高了17.8%.数值模拟和试验证实了电磁热止裂技术对降低焊接接头应力集中、提高其抗拉性能的有效性.
The numerical simulation of tensile process is obtained after pulse current discharge for 16 Mn welded joint with crack.The impact on pulse current discharge for the crack edge's stress is analyzed.The obtained results show that via pulse current discharge the stress concentration at the edge of crack decreases when tension pressure acts on the welded joint,but its tension property is improved.The experiment about pulse discharge and tensile properties for 16 Mn welded joint with crack is done.It proves that by the way of pulse current discharge the edge of crack is bluntly,meanwhile specimen produces the structure of white layer which is hard and tough,homogeneous fracture and the welded joint 's tensile properly is improved by17.8%.Both numerical simulation and experiment can confirm that electromagnetic and thermal arrest technique can reduce welded joint's stress concentration and improve its tensile intensity.
The numerical simulation of tensile process is obtained after pulse current discharge for 16 Mn welded joint with crack.The impact on pulse current discharge for the crack edge's stress is analyzed.The obtained results show that via pulse current discharge the stress concentration at the edge of crack decreases when tension pressure acts on the welded joint,but its tension property is improved.The experiment about pulse discharge and tensile properties for 16 Mn welded joint with crack is done.It proves that by the way of pulse current discharge the edge of crack is bluntly,meanwhile specimen produces the structure of white layer which is hard and tough,homogeneous fracture and the welded joint 's tensile properly is improved by17.8%.Both numerical simulation and experiment can confirm that electromagnetic and thermal arrest technique can reduce welded joint's stress concentration and improve its tensile intensity.
引文
[1]张彦华.焊接力学与结构完整性原理[M].北京:北京航天航空大学出版社,2007.
[2]刘曦.含焊接缺陷构件的疲劳可靠性评定[J].焊接学报,2008,29(1):89-92.Liu Xi.Fatigue reliability evaluation for welding construction containing welding defects[J].Transactions of the China Welding Institution,2008,29(1):89-92.
[3]付宇明,周红梅,郑丽娟.含圆形埋藏裂纹金属构件电磁热止裂时应变能密度分析[J].工程力学,2013,30(1):413-418.Fu Yuming,Zhou Hongmei,Zheng Lijuan.Analysis on strain energy density during crack arresting using electromagnetic heating in metal component with circular embedding crack[J].Engineering Mechanics,2013,30(1):413-418.
[4]付宇明,周红梅,郑丽娟.含埋藏椭圆形裂纹金属构件电磁热止裂时热应力场分析[J].固体力学学报,2013,34(2):169-173.Fu Yuming,Zhou Hongmei,Zheng Lijuan.Analysis on thermal stress fiele at the moment of crack arrest by electromagnetic heating in metal component with elliptical embedding crack[J].Chinese Journal of Solid Mechanics,2013,34(2):169-173.
[5]郑丽娟,付宇明,田振国,等.带有圆形半埋藏裂纹金属构件放电瞬间的温度场分析[J].机械工程学报,2004,40(11):139-143.Zheng Lijuan,Fu Yuming,Tian Zhenguo,et al.Analysis on temperature field in a metal component with a circle half-embedding crack at the moment when the current is switched on[J].Chinese Journal of Mechanical Engineering,2004,40(11):139-143.
[6]郑丽娟,柴璇,韩晓娟,等.带有埋藏裂纹的焊接接头电磁热强化及力学性能分析[J].焊接学报,2011,32(10):5-8.Zheng Lijuan,Chai Xuan,Han Xiaojuan,et al.Analysis on electromagnetic heat strengthening of welded joint with embedding crack and mechanical performance testing[J].Transactions of the China Welding Institution,2011,32(10):5-8.
[7]付宇明,郑丽娟,何大川,等.45钢焊接接头电磁热强化及力学性能分析[J].焊接学报,2008,29(5):5-8.Fu Yuming,Zheng Lijuan,He Dachuan,et al.Strengthening of welded joint of 45 steel by electromagnetic heat effect and mechanical its performance analysis[J].Transactions of the China Welding Institution,2008,29(5):5-8.
[8]付宇明,田振国,郑丽娟,等.含埋藏椭圆形裂纹的金属构件脉冲放电瞬间温度场分析[J].应用数学与力学,2008,29(7):871-876.Fu Yuming,Tian Zhenguo,Zheng Lijuan,et al.Analysis on temperature field at the time of pulse current discharge in metal structure with elliptical embedding crack[J].Applied Mathematics and Mechanics,2008,29(7):871-876.
[9]Fu Y M,Tian Z G,Zheng L J,et al.Temperature field at the time of pulse current discharge in metal structure with elliptical embedding crack[J].Applied of Mathmatics and Mechanicis,2008,29(7):961-966.
[10]付宇明,郑丽娟,白象忠.带有半埋藏空间裂纹的Cr12构件电磁热止裂分析[J].固体力学学报,2008,29(2):134-140.Fu Yuming,Zheng Lijuan,Bai Xiangzhong.Analysis on crack arrest by electromagnetic heating in Cr12 components with spatially half-embedding cracks[J].Chinese Journal of Solid Mechanics,2008,29(2):134-140.
[11]付宇明,郑丽娟,白象忠.T10钢金属模具中裂纹电磁热止裂的实验研究[J].实验力学,2004,19(4):488-492.Fu Yuming,Zheng Lijuan,Bai Xiangzhong.Experimental research on crack arrest in metal die using electromagnetic heating[J].Journal of Experimental Mechanics,2004,19(4):488-492.
[2]刘曦.含焊接缺陷构件的疲劳可靠性评定[J].焊接学报,2008,29(1):89-92.Liu Xi.Fatigue reliability evaluation for welding construction containing welding defects[J].Transactions of the China Welding Institution,2008,29(1):89-92.
[3]付宇明,周红梅,郑丽娟.含圆形埋藏裂纹金属构件电磁热止裂时应变能密度分析[J].工程力学,2013,30(1):413-418.Fu Yuming,Zhou Hongmei,Zheng Lijuan.Analysis on strain energy density during crack arresting using electromagnetic heating in metal component with circular embedding crack[J].Engineering Mechanics,2013,30(1):413-418.
[4]付宇明,周红梅,郑丽娟.含埋藏椭圆形裂纹金属构件电磁热止裂时热应力场分析[J].固体力学学报,2013,34(2):169-173.Fu Yuming,Zhou Hongmei,Zheng Lijuan.Analysis on thermal stress fiele at the moment of crack arrest by electromagnetic heating in metal component with elliptical embedding crack[J].Chinese Journal of Solid Mechanics,2013,34(2):169-173.
[5]郑丽娟,付宇明,田振国,等.带有圆形半埋藏裂纹金属构件放电瞬间的温度场分析[J].机械工程学报,2004,40(11):139-143.Zheng Lijuan,Fu Yuming,Tian Zhenguo,et al.Analysis on temperature field in a metal component with a circle half-embedding crack at the moment when the current is switched on[J].Chinese Journal of Mechanical Engineering,2004,40(11):139-143.
[6]郑丽娟,柴璇,韩晓娟,等.带有埋藏裂纹的焊接接头电磁热强化及力学性能分析[J].焊接学报,2011,32(10):5-8.Zheng Lijuan,Chai Xuan,Han Xiaojuan,et al.Analysis on electromagnetic heat strengthening of welded joint with embedding crack and mechanical performance testing[J].Transactions of the China Welding Institution,2011,32(10):5-8.
[7]付宇明,郑丽娟,何大川,等.45钢焊接接头电磁热强化及力学性能分析[J].焊接学报,2008,29(5):5-8.Fu Yuming,Zheng Lijuan,He Dachuan,et al.Strengthening of welded joint of 45 steel by electromagnetic heat effect and mechanical its performance analysis[J].Transactions of the China Welding Institution,2008,29(5):5-8.
[8]付宇明,田振国,郑丽娟,等.含埋藏椭圆形裂纹的金属构件脉冲放电瞬间温度场分析[J].应用数学与力学,2008,29(7):871-876.Fu Yuming,Tian Zhenguo,Zheng Lijuan,et al.Analysis on temperature field at the time of pulse current discharge in metal structure with elliptical embedding crack[J].Applied Mathematics and Mechanics,2008,29(7):871-876.
[9]Fu Y M,Tian Z G,Zheng L J,et al.Temperature field at the time of pulse current discharge in metal structure with elliptical embedding crack[J].Applied of Mathmatics and Mechanicis,2008,29(7):961-966.
[10]付宇明,郑丽娟,白象忠.带有半埋藏空间裂纹的Cr12构件电磁热止裂分析[J].固体力学学报,2008,29(2):134-140.Fu Yuming,Zheng Lijuan,Bai Xiangzhong.Analysis on crack arrest by electromagnetic heating in Cr12 components with spatially half-embedding cracks[J].Chinese Journal of Solid Mechanics,2008,29(2):134-140.
[11]付宇明,郑丽娟,白象忠.T10钢金属模具中裂纹电磁热止裂的实验研究[J].实验力学,2004,19(4):488-492.Fu Yuming,Zheng Lijuan,Bai Xiangzhong.Experimental research on crack arrest in metal die using electromagnetic heating[J].Journal of Experimental Mechanics,2004,19(4):488-492.