超高强钢点焊结构疲劳试验分析

王晓光; 宇慧平; 李晓阳; 陈树君

超高强钢点焊结构疲劳试验分析

北京工业大学机电学院工程力学实验中心, 北京 100124

基金项目: 北京市自然科学基金资助项目(3122004);高档数控机床与基础制造装备科技重大专项(2104ZX04001171)

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- 收稿日期: 2015-01-06

Fatigue test analysis of ultra-high strength steel spot welded structure

College of Mechanical and Electronic Engineering, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 以超高强淬火钢22MnB5为母体的点焊结构为研究对象,分别通过恒压和锻压工艺,利用光学显微镜,运用成组法进行了疲劳试验测试分析,结果表明,锻压和恒压二种工艺的p-S-N曲线显示出前者比后者工艺的疲劳寿命分散性略大及两种工艺的断裂模式基本相同,裂纹在焊核与热影响区交界处发生,并进一步向两侧较对称扩展至母材区,成为裂纹起裂点.异种母材与同种母材的试样发生疲劳断裂的位置相同,均为焊核与内层热影响区的交界处,异种母材的试样在裂纹扩展形态具有不对称性,疲劳失效均发生在低碳钢焊核处,得到三种应力等级下焊点的疲劳寿命变化曲线.
- 超高强钢 /
- 点焊结构 /
- 疲劳寿命 /
- 试验分析
Abstract: Fatigue test of 22MnB5 ultra-high strength quenched steel spot welded structure was conducted with constant pressure and forging technology, respectively, by means of optical microscope and grouping approach. the p-s-n curves in forging and constant pressure processes display that the dispersion of former fatigue life was slightly larger than the latter one, and the fracture mode for two processes were basically the same. Cracking occurred at the junction of weld and heat-affected zone, and further propagated from both sides symmetrically to the substrate, becoming the origin of failure. The fatigue fracture position located at the junction of inner heat-affected zone and weld for both heterogeneous substrates and homogeneous substrates. However, the crack propagation in heterogeneous specimens was asymmetric, fatigue failure occurred in the low carbon steel weld, and fatigue life curves of solder joints in three stress levels.
- ultra-high strength steel /
- spot welded structure /
- fatigue life /
- test analysis

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参考文献(10)

[1]	王瑞珍, 罗海文, 董瀚. 汽车用高强度钢板的最新研究进展[J]. 中国冶金, 2006(9): 1-9. Wang Ruizhen, Luo Haiwen, Dong Han. The latest progress in the car high strength steel[J]. Joural of metallurgy in China, 2006(9): 1-9.
[2]	彭振国. 在汽车制造中的焊接技术现状及发展趋势[J]. 现代焊接, 2006, 44(8): 5-9. Peng Zhenguo. present situation and development trend of welding technology in automotive manufacturing[J]. Journal of modern welding, 2006, 44(8): 5-9.
[3]	宇慧平, 王伟伟, 李晓阳, 等. 超高强钢点焊结构拉剪试验及数值仿真[J]. 焊接学报, 2013, 34(10): 9-12. Yu Huiping, Wang Weiwei, Li Xiaoyang, et al. Tesile shear test and numerical simulation of ultra high strength structure[J]. Transactions of the China Welding Institution, 2004, 25(2): 19-22.
[4]	韩立军, 谷诤巍, 张正林. 超高强淬火钢板中频点焊接头组织与断口形貌[J]. 焊接学报, 2010, 31(4): 101-104. Han Lijun, Gu Zhengwei, Zhang Zhenglin. Microstructure and fractography of intermediate frequency spot welding of precision ultra-high strength quenching steel[J]. Transactions of the China Welding Institution, 2010, 31(4): 101-104.
[5]	许君, 张延松, 朱平. 双相钢搭接点焊接头疲劳寿命分析[J]. 焊接学报, 2008, 29(5): 45-48. Xu Jun, Zhang Yansong, Zhu Ping. Fatigue life analysis of lap-shear spot weld of dual phase steels[J]. Transactions of the China Welding Institution, 2008, 29(5): 45-48.
[6]	Yung J Y, Lawrence F V. Analytical and graphical aids for the fatigue design of weldments[J]. Fatigue & Fracture of Engineering Materials & Structures, 2007, 8(3): 223-241.
[7]	Niu X, GlinkA G. The weld profile effect on stress intensity factors in weldments[J]. International Journal of Fracture, 1987, 35(1): 3-20.
[8]	Andrews R M. The effect of misalignment on the fatigue strength of welded cruciform joints[J]. Fatigue & Fracture of Engineering Materials & Structures, 1996, 19(6): 755-768.
[9]	Lazzarin P, Tovo R. A notch intensity factor approach to the stress analysis of welds[J]. Fatigue & Fracture of Engineering Materials & Structures, 2002, 21(9): 1089-1103.
[10]	Ertas A H, Sonmez F O. A parametric study on fatigue strength of spot-weld joints[J]. Fatigue & Fracture of Engineering Materials & Structures, 2008, 31(9): 766-776.

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超高强钢点焊结构疲劳试验分析

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Fatigue test analysis of ultra-high strength steel spot welded structure

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