基于损伤力学的蒸汽转化炉热壁集气管蠕变损伤有限元分析
Finite Element Analysis on Creep Damage for Hot Outlet Manifold ofSteam Reformer Based on Damage Mechanics
摘 要
基于改进的Liu-Murakami本构模型，结合有限元方法，对理想工况下蒸汽转化炉热壁集气管进行了蠕变损伤分析。结果表明：改进的Liu-Murakami模型能够较为准确地预测不同应力水平下集气管的单轴蠕变曲线；理想条件下，集气管在服役初始阶段的最大Mises应力和最大主应力出现在猪尾管和集气管交界处；服役过程中，集气管发生应力再分布，最大Mises应力和最大主应力均显著减小；服役105 h后，集气管最大损伤值仅为0.071。
20Cr32Ni1Nb钢
蠕变损伤
有限元模拟
manifold
20Cr32Ni1Nb steel
creep damage
finite element simulation
Abstract
Creep damage analysis of hot outlet manifold of steam reformer under the ideal operating condition was carried out by finite element methods based on improved Liu-Murakami constitutive model. The results show that the improved Liu-Murakami model could predict the uniaxial creep curve of the manifold under different stress levels accurately. Under ideal conditions, the maximum Mises stress and the maximum principal stress in initial service stage appeared at the junction of the pigtail pipe and the manifold. During the service process, stress redistribution occurred in the manifold, the maximum Mises stress and the maximum principal stress were significantly reduced. After serving for 105 h, the maximum damage value of the manifold was only 0.071.
中图分类号 TG115.9 DOI 10.11973/jxgccl202008015
所属栏目 物理模拟与数值模拟
基金项目 国家重点研发计划资助项目（2017YFF0210401）；国家自然科学基金资助项目（51805274）
收稿日期 2019/8/14
修改稿日期 2020/7/12
网络出版日期
作者单位点击查看
备注王斌(1965-),男,内蒙古包头人,副教授,硕士
引用该论文: WANG Bin,NAN Ningning,GUO Xiaofeng,GONG Jianming,CHAO Ke. Finite Element Analysis on Creep Damage for Hot Outlet Manifold ofSteam Reformer Based on Damage Mechanics[J]. Materials for mechancial engineering, 2020, 44(8): 74～77
王斌,南宁宁,郭晓峰,巩建鸣,朝克. 基于损伤力学的蒸汽转化炉热壁集气管蠕变损伤有限元分析[J]. 机械工程材料, 2020, 44(8): 74～77
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参考文献
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【2】LARSON F,MILLER J.A time-temperature relationship for rupture and creep stresses[J].Transactions of the ASME,1952,74:765-771.
【3】MANSON S S, HAFERD A M. A linear time-temperature relation for extrapolation of creep and stress-rupture data[J]. NACA Technical Notes 2890, 1953.
【4】EVANS M.The θ projection method and small creep strain interpolations in a commercial Titanium alloy[J].Journal of Materials Science,2001,36(12):2875-2884.
【5】涂善东.高温结构完整性原理[M].北京:科学出版社,2003.
【6】BECKER A,HYDE T,SUN W,et al.Benchmarks for finite element analysis of creep continuum damage mechanics[J].Computational Materials Science, 2002,25(1/2):34-41.
【7】荆建平,孟光.汽轮机转子疲劳-蠕变损伤的非线性损伤力学分析[J].中国电机工程学报,2003,23(9):167-172.
【8】HYDE T H,BECKER A A,SUN W,et al.Finite-element creep damage analyses of P91 pipes[J].International Journal of Pressure Vessels and Piping,2006,83(11/12):853-86.
【9】GUO X F,GONG J M,GENG L Y.An improved continuum damage constitutive model for creep deformation of cast 20Cr32Ni1Nb steel[C]//Proceedings of ASME Conference on ASME 2017 Pressure Vessels and Piping Conference. Waikoloa, Hawaii:[s.n.],2017.
【10】HAYHURST D R.Creep rupture under multi-axial states of stress[J].Journal of the Mechanics and Physics of Solids, 1972,20(6):381-382.
【11】LIU Y,MURAKAMI S.Damage localization of conventional creep damage models and proposition of a new model for creep damage analysis[J].JSME International Journal Series A, 1998,41(1):57-65.
【12】KOWALEWSKI Z L,HAYHURST D R,DYSON B F.Mechanisms-based creep constitutive equations for an aluminium alloy[J].The Journal of Strain Analysis for Engineering Design, 1994,29(4):309-316.
【13】郭晓峰. 高参数蒸汽转化炉20Cr32Ni1Nb热壁集气管高温损伤研究[D]. 南京: 南京工业大学,2017.
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