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 of Steam Reformer Based on Damage Mechanics

作　　者：王斌[1] 南宁宁 郭晓峰[1] 巩建鸣[2] 朝克 WANG Bin;NAN Ningning;GUO Xiaofeng;GONG Jianming;CHAO Ke(School of Mechanical Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China;Inner Mongolia North Hauler Joint Stock Co.,Ltd.,Baotou 014030,China)

机构地区：[1]内蒙古科技大学机械工程学院,包头014010 [2]南京工业大学机械与动力工程学院,南京211816 [3]内蒙古北方重型汽车股份有限公司,包头014030

出　　处：《机械工程材料》2020年第8期74-77,共4页Materials For Mechanical Engineering

基　　金：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)。

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10^5 h后,集气管最大损伤值仅为0.071。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 10^5 h,the maximum damage value of the manifold was only 0.071.

关 键 词：集气管 20Cr32Ni1Nb钢 蠕变损伤 有限元模拟 

分 类 号：TG115.9[金属学及工艺—物理冶金]