基于非线性损伤理论的焊接疲劳设计
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摘要
构建一种基于非线性损伤理论的焊接疲劳设计模式,能有效地用于多级疲劳载荷作用下焊接接头的疲劳设计与分析。所构建的设计模式,不仅考虑了多级疲劳载荷的加载次序效应,也考虑了载荷间的相互影响。采用Manson-Halford累积损伤模型以及改进模型来处理加载次序效应,以应力比的形式来体现载荷间相互作用,利用所构建疲劳设计模式对标准焊接接头进行疲劳设计,讨论了不同疲劳载荷加载次序以及载荷级数等因素对焊接结构疲劳设计参数应力因数的影响,并将设计结果与基于传统Miner理论的设计结果进行比较。数值结果表明,基于非线性累积损伤理论所建的焊接疲劳设计模式,可对焊接接头的疲劳特性进行有效的设计分析,具有较高的精度和可信度。所建焊接结构疲劳设计模式能够较好地处理载荷次序效应以及载荷间的相互影响,且模型参数相对较少,可应用于实际工程设计。
A welding fatigue design model is constructed based on nonlinear damage theory, which can be effectively used for fatigue design and analysis of welded joints under multi-level fatigue load. The fatigue design model considers the load sequence effect and the influence of load interaction. The Manson-Halford cumulative damage model and its improved model are used to deal with the load sequence effect. The interaction between the loads is reflected in the form of stress ration. For the fatigue design of standard welded joints, influences of stress factor caused by different loading sequences and the level of load are discussed. Numerical examples are provided to test the performance of the proposed method, by comparing with the design results based on the traditional Miner theory, and satisfactory results are achieved with higher precision and reliability. The design model can better deal with the load sequence effect and the load interaction with less model parameters, and can be applied in engineering.
A welding fatigue design model is constructed based on nonlinear damage theory, which can be effectively used for fatigue design and analysis of welded joints under multi-level fatigue load. The fatigue design model considers the load sequence effect and the influence of load interaction. The Manson-Halford cumulative damage model and its improved model are used to deal with the load sequence effect. The interaction between the loads is reflected in the form of stress ration. For the fatigue design of standard welded joints, influences of stress factor caused by different loading sequences and the level of load are discussed. Numerical examples are provided to test the performance of the proposed method, by comparing with the design results based on the traditional Miner theory, and satisfactory results are achieved with higher precision and reliability. The design model can better deal with the load sequence effect and the load interaction with less model parameters, and can be applied in engineering.
引文
[1]郑松林,梁国清,王治瑞,等.考虑低幅锻炼载荷的某轿车摆臂载荷谱编制[J].机械工程学报,2014,50(16):147-154.ZHENG Songlin,LIANG Guoqing,WANG Zhirui,et al.Complication of automotive lower control arm spectrum based on the low-amplitude training load[J].Journal of Mechanical Engineering,2014,50(16):147-154.
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[11]黄洪钟,朱顺鹏,汪忠来,等.基于剩余强度衰减退化的非线性累积损伤准则及其可靠性定寿[J].应用基础与工程科学学报,2011,19(2):323-334.HUANG Hongzhong,ZHU Shunpeng,WANG Zhonglai,et al.Nonlinear fatigue damage cumulative rule based on strength degradation and its application to fatigue life reliability analysis[J].Journal of Basic Science and Engineering,2011,19(2):323-334.
[12]ZHU S,HUANG H,HE L,et al.A generalized energy-based fatigue-creep damage parameter for life prediction of turbine disk alloys[J].Engineering Fracture Mechanics,2012,90(90):89-100.
[13]GOLOS K,ELLYIN F.A total strain energy density theory for cumulative fatigue damage[J].Journal of Pressure Vessel Technology,1988,110(1):36-41.
[14]GAO H,HUANG H,LV Z,et al.An improved Corten-Dolan’s model based on damage and stress state effects[J].Journal of Mechanical Science&Technology,2015,29(8):3215-3223.
[15]MARCO S,STARKEY W.Starkey.A concept of fatigue damage[J].Transaction of the ASME,1954,76:627-632.
[16]MANSON S,HALFORD G.Practical implementation of the double linear damage rule and damage curve approach for treating cumulative fatigue damage[J].International Journal of Fatigue,1981,17(2):169-192.
[17]高会英.复杂应力状态下焊接接头的疲劳寿命预测方法研究[D].成都:电子科技大学,2016.GAO Huiying.Research on fatigue life prediction methods of welded joints under complex stress states[D].Chengdu:University of Electronic Science and Technology of China,2016.
[18]GAO H,HUANG H,ZHU S,et al.A modified nonlinear damage accumulation model for fatigue life prediction considering load interaction effects[J].The Scientific World Journal,2014,2014(1):164378.
[19]兆文忠,李向伟,董平沙.焊接结构抗疲劳设计理论与方法[M].北京:机械工业出版社,2017.YAO Wenzhong,LI Xiangwei,DONG Pingsha.Theory and method of anti fatigue design of welding structure[M].Beijing:China Machine Press,2017.
[2]李广全,刘志明,王文静,等.高速动车组齿轮箱疲劳裂纹机理分析研究[J].机械工程学报,2017,53(2):99-105.LI Guangquan,LIU Zhiming,WANG Wenjing,et al.Fatigue crack mechanism study on high-speed EMUgearbox[J].Journal of Mechanical Engineering,2017,53(2):99-105.
[3]王文静,惠晓龙,马纪军.高速列车设备舱支架疲劳裂纹机理研究[J].机械工程学报,2015,51(6):142-147.WANG Wenjing,HUI Xiaolong,MA Jijun.Fatigue crack mechanism research on high speed train equipment cabin frame[J].Journal of Mechanical Engineering,2015,51(6):142-147.
[4]British Standard Institute.BS 7608-2014+A1-2015Fatigue design and assessment of steel structures[S].London:BSI,2015.
[5]李晓峰,谢素明,时慧焯,等.车辆焊接结构疲劳寿命评估方法研究[J].中国铁道科学,2007,28(3):74-78.LI Xiaofeng,XIE Suming,SHI Huizhuo,et al.Study on the analysis method for fatigue life prediction of vehicle welded structure[J].China Railway Science,2007,28(3):74-78.
[6]田军,刘志明,何如.动车铝合金车体焊接接头非线性疲劳累积损伤模型[J].铁道学报,2012,34(3):40-43.TIAN Jun,LIU Zhiming,HE Ru.Nonlinear fatigue-cumulative damage model for welded aluminum alloy joint of EMU[J].Journal of the China Railway Society,2012,34(3):40-43.
[7]谢素明,周晓坤,李向伟,等.基于美国ASME标准的重载货车车体焊缝疲劳寿命预测[J].计算力学学报,2012,29(1):129-134.XIE Suming,ZHOU Xiaokun,LI Xiangwei,et al.Fatigue life prediction for weld line in heavy freight carbody based on ASME standard[J].Chinese Journal of Computational Mechanics,2012,29(1):129-134.
[8]YUAN R,LI H,HUANG H,et al.A new non-linear continuum damage mechanics model for fatigue life prediction under variable loading[J].Mechanics,2013,19(5):506-511.
[9]DATTOMA V,GIANCANE S,NOBILE R,et al.Fatigue life prediction under variable loading based on a new non-linear continuum damage mechanics model[J].International Journal of Fatigue,2006,28(2):89-95.
[10]王旭亮,聂宏.考虑载荷加载顺序的模糊Miner理论研究[J].中国机械工程,2008,19(22):2725-2728.WANG Xuliang,NIE Hong.Study on fuzzy miner’s rule considering load sequence[J].China Mechanical Engineering,2008,19(22):2725-2728.
[11]黄洪钟,朱顺鹏,汪忠来,等.基于剩余强度衰减退化的非线性累积损伤准则及其可靠性定寿[J].应用基础与工程科学学报,2011,19(2):323-334.HUANG Hongzhong,ZHU Shunpeng,WANG Zhonglai,et al.Nonlinear fatigue damage cumulative rule based on strength degradation and its application to fatigue life reliability analysis[J].Journal of Basic Science and Engineering,2011,19(2):323-334.
[12]ZHU S,HUANG H,HE L,et al.A generalized energy-based fatigue-creep damage parameter for life prediction of turbine disk alloys[J].Engineering Fracture Mechanics,2012,90(90):89-100.
[13]GOLOS K,ELLYIN F.A total strain energy density theory for cumulative fatigue damage[J].Journal of Pressure Vessel Technology,1988,110(1):36-41.
[14]GAO H,HUANG H,LV Z,et al.An improved Corten-Dolan’s model based on damage and stress state effects[J].Journal of Mechanical Science&Technology,2015,29(8):3215-3223.
[15]MARCO S,STARKEY W.Starkey.A concept of fatigue damage[J].Transaction of the ASME,1954,76:627-632.
[16]MANSON S,HALFORD G.Practical implementation of the double linear damage rule and damage curve approach for treating cumulative fatigue damage[J].International Journal of Fatigue,1981,17(2):169-192.
[17]高会英.复杂应力状态下焊接接头的疲劳寿命预测方法研究[D].成都:电子科技大学,2016.GAO Huiying.Research on fatigue life prediction methods of welded joints under complex stress states[D].Chengdu:University of Electronic Science and Technology of China,2016.
[18]GAO H,HUANG H,ZHU S,et al.A modified nonlinear damage accumulation model for fatigue life prediction considering load interaction effects[J].The Scientific World Journal,2014,2014(1):164378.
[19]兆文忠,李向伟,董平沙.焊接结构抗疲劳设计理论与方法[M].北京:机械工业出版社,2017.YAO Wenzhong,LI Xiangwei,DONG Pingsha.Theory and method of anti fatigue design of welding structure[M].Beijing:China Machine Press,2017.