| 钢板点焊翘曲缺陷对平均应力强度因子的影响 |
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| 引用本文： | 宋凯,苏玉龙,杜展鹏,陈少伟. 钢板点焊翘曲缺陷对平均应力强度因子的影响[J]. 中国机械工程, 2021, 32(5): 505-511. DOI: 10.3969/j.issn.1004-132X.2021.05.001 |
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| 作者姓名： | 宋凯 苏玉龙 杜展鹏 陈少伟 |
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| 作者单位： | 湖南大学汽车车身先进设计制造国家重点实验室，长沙，410082 |
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| 基金项目： | 国家自然科学基金（U1864207，51605155） |
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| 摘 要： | 车身焊接易造成翘曲缺陷,显著影响其疲劳寿命.针对翘曲缺陷对平均应力强度因子的影响,基于力学理论和有限元法,将焊点模型模块化,对比分析仿真得出的合格焊点平均应力强度因子ΔK qua与翘曲缺陷焊点平均应力强度因子ΔK def.通过寻找影响因素及影响规律,提出翘曲因子C的概念并通过仿真验证其适用性.仿真分析与理论推导得出的平...
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| 关 键 词： | 翘曲缺陷 翘曲因子 平均应力强度因子 模块化焊点模型 |
Effects of Warping Defects of Steel Plate Resistance Spot Welding on Average Stress Intensity Factor |
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| SONG Kai,SU Yulong,DU Zhanpeng,CHEN Shaowei. Effects of Warping Defects of Steel Plate Resistance Spot Welding on Average Stress Intensity Factor[J]. China Mechanical Engineering, 2021, 32(5): 505-511. DOI: 10.3969/j.issn.1004-132X.2021.05.001 |
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| Authors: | SONG Kai SU Yulong DU Zhanpeng CHEN Shaowei |
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| Affiliation: | State Key Laboratory of Advanced Design and Manufacture for Vehicle Body,Hunan University,Changsha,410082 |
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| Abstract: | Welding of car body might easily cause warping defects, which significantly affected the fatigue life. Aiming at influences of warping defects on the average stress intensity factor, solder joint model was modularized based on mechanics theory and finite element method. Qualified solder joints average stress intensity factor ΔKqua obtained by simulation and warping defect solder joints average stress intensity factor ΔKdef obtained by simulation were compared and analyzed. By looking for influence factors and influence rules, the definition of warping factor was proposed, and the applicability was verified through simulation. The average errors between the average stress intensity factors obtained by simulation analysis and theoretical derivation are less than 6%. Experiments show that the average accuracy of the warping defect solder joint ΔKdef corrected by warping factor is as 84.6%. |
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| Keywords: | warping defect warping factor average stress intensity factor modular solder joint mode |
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