基于等效结构应力法的铸钢分叉节点环形对接焊缝的疲劳分析
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摘要
为了掌握铸钢分叉节点与构件连接时焊缝的疲劳性能,利用等效结构应力法对铸钢分叉节点的环形对接焊缝进行了疲劳分析。通过等效结构应力场和缺口应力场确定网格不敏感结构应力,并综合考虑裂纹扩展、缺口应力和疲劳寿命等影响因素,实现等效结构应力的转化,再结合疲劳设计主S-N曲线对焊缝的疲劳寿命进行计算;在ABAQUS静力分析的基础上,利用基于等效结构应力法原理而开发的有限元分析软件FE-SAFE/VERITY,对铸钢分叉节点环形对接焊缝的疲劳寿命进行了分析。研究结果表明:铸钢分叉节点主管端部的环形对接焊缝最危险处的循环次数为105.711;等效结构应力法具有网格不敏感性,利用等效结构应力法能够较好地预测铸钢分叉节点环形对接焊缝的疲劳寿命。
Welding seam plays a controlling role in the fatigue behavior of cast steel joint with branches. Fatigue analysis of girth butt weld of cast steel joint with branches is carried out by equivalent structural stress method. By using the equivalent structural stress field and the notch stress field, the stress of the mesh insensitive structure is calculated. The transformation of equivalent structural stress is realized by taking into account the crack propagation, the notch stress and the fatigue life of structures. The fatigue life of the weld is calculated by using the master S-N curve of the fatigue design. Based on ABAQUS static analysis, the fatigue life of girth butt weld of cast steel joint with branches is analyzed by the software FE-SAFE/VERITY. The results show that the number of cycles in the most dangerous part of the girth butt weld at the main pipe of the cast steel joint with branches is 105.711. The equivalent structure stress method has the advantage of mesh insensitivity, and it can be used to predict the fatigue life of girth butt weld of cast steel joint with branches.
Welding seam plays a controlling role in the fatigue behavior of cast steel joint with branches. Fatigue analysis of girth butt weld of cast steel joint with branches is carried out by equivalent structural stress method. By using the equivalent structural stress field and the notch stress field, the stress of the mesh insensitive structure is calculated. The transformation of equivalent structural stress is realized by taking into account the crack propagation, the notch stress and the fatigue life of structures. The fatigue life of the weld is calculated by using the master S-N curve of the fatigue design. Based on ABAQUS static analysis, the fatigue life of girth butt weld of cast steel joint with branches is analyzed by the software FE-SAFE/VERITY. The results show that the number of cycles in the most dangerous part of the girth butt weld at the main pipe of the cast steel joint with branches is 105.711. The equivalent structure stress method has the advantage of mesh insensitivity, and it can be used to predict the fatigue life of girth butt weld of cast steel joint with branches.
引文
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[2]唐涛,张飞庆,佘玲娟.基于名义应力法的高强钢泵车臂架疲劳寿命研究[J].工程机械,2016,47(3):12-17.(TANG Tao,ZHANGFeiqing,SHE Lingjuan.A study on fatigue life of high strength steel used in pump truck boom frames as based on nominal stress process[J].Construction machinery and equipment,2016,47(3):12-17(in Chinese)).
[3]秦培江,马永亮,孟繁星.管节点热点应力参数化分析方法[J].舰船科学技术,2016(增刊1):118-122.(QIN Peijiang,MA Yongliang,MENG Fanxing.Parametric analysis method of spot stress in tubular joints[J].Ship science and technology,2016(S1):118-122(in Chinese)).
[4]韩庆华,陈志钢,芦燕.铸钢节点环形对接焊缝热点应力分析[J].建筑结构学报,2011,32(12):250-256.(HAN Qinghua,CHENZhigang,LU Yan.Hot spot stress analysis of girth butt weld in cast steel joint[J].Journal of building structures,2011,32(12):250-256(in Chinese)).
[5]靳慧,李菁,张其林.铸钢节点环形对接焊缝的疲劳计算[J].同济大学学报(自然科学版),2009,37(1):20-25.(JIN Hui,LI Jing,ZHANG Qilin.Application of hot spot stress method to fatigue life evaluation of girth butt welds of cast steel node[J].Journal of Tongji university(natural science),2009,37(1):20-25(in Chinese)).
[6]韩庆华,郭琪,林允昶.不同焊接构造的铸钢节点环形对接焊缝的热点应力分析[J].工业建筑,2014,44(11):155-159.(HANQinghua,GUO Qi,LIN Yunchang.Hot spot stress analysis of different girth butt weld details of cast steel joint[J].Industrial construction,2014,44(11):155-159(in Chinese)).
[7]DONG P.A robust structural stress method for fatigue analysis of offshore and marine structures[J].ASME international conference offshore mechanics&arctic engineering,2003,127(1):68-74.
[8]DONG P,HONG J K.Analysis of hot spot stress and alternative structural stress methods[J].ASME international conference offshore mechanics&arctic engineering,2003,25(10):213-224.
[9]DONG P,PRAGER M,OSAGE D.The design master S-N curve in ASME Div2 rewrite and its validations[J].Welding in the world,2007,51(5/6):53-63.
[10]DONG P.Length scale of secondary stresses in fracture and fatigue[J].International journal of pressure vessels and piping,2008,85(3):128-143.
[11]ASME.2007 ASME boiler and pressure vessel code:BPVC-X-2007[S].New York:The American Society of Mechanical Engineers,2007.
[12]ASME.Fitness-for-service:API 579-1/ASME FES-1[S].Washington:The American Petroleum Institute,2007.
[13]American Welding Society.Structural welding codes-steel:AWSD1.1/D1M:2010[S].Miami:American Welding Society,2010.
[14]DONG P,HONG J K,OSAGE D,et al.Master S-N curve method for fatigue evaluation of welded components[J].Welding research council bulletin,2002(474):1-44.
[15]ASME.Boiler and pressure vessel code:BPVC-X-2017[S].New York:The American Society of Mechanical Engineers,2017.
[16]DONG P,HONG J K.The master S-N curve approach to fatigue of piping and vessel welds[J].Welding in the world,2004,48(1/2):28-36.
[17]DONG P,HONG J K.The master S-N curve approach to fatigue evaluation of offshore and marine structures[C]//Proceedings of International Conference on Offshore Mechanics and Arctic Engineering.Vancouver,Canada:ASME,2004:847-855.
[18]李鹏,马君峰,王纯,等.基于振动疲劳损伤分析的飞机壁板结构加筋参数优选[J].应用力学学报,2017,34(4):691-697.(LI Peng,MA Junfeng,WANG Chun,et al.Optimization of stiffened panel structure parameters based on vibration fatigue damage analysis[J].Chinese journal of applied mechanics,2017,34(4):691-697(in Chinese)).
[19]盛兴旺,郑纬奇,雷佶洲,等.闪光对焊连接HRB400级钢筋疲劳试验与试验影响因素研究[J].应用力学学报,2017,34(6):1150-1154.(SHENG Xingwang,ZHENG Weiqi,LEI Jiezhou,et al.Free and forced vibration of laminated plates resting on three-parameter viscoelastic foundations[J].Chinese journal of applied mechanics,2017,34(6):1150-1154(in Chinese)).