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材料工程  2017, Vol. 45 Issue (3): 60-65    DOI: 10.11868/j.issn.1001-4381.2015.000098
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
椭球壳液压胀形过程焊缝建模方式的研究
张伟玮1, 滕步刚1,2
1. 哈尔滨工业大学 材料科学与工程学院, 哈尔滨 150001;
2. 哈尔滨工业大学 金属精密热加工国家重点实验室, 哈尔滨 150001
Research on Weld Seam Models for Hydro-forming of Ellipsoidal Shell
ZHANG Wei-wei1, TENG Bu-gang1,2
1. School of Materials Science and Technology, Harbin Institute of Technology, Harbin 150001, China;
2. National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
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摘要 为了研究焊缝区域有限元建模方式对椭球壳胀形过程轴长变化规律的影响,提出3种焊缝建模方式:即完整焊缝模型,粗略焊缝模型与无焊缝模型。首先进行初始轴长比为1.8的椭球壳的液压胀形实验研究,得到轴长随内压力的变化规律。其次进行了3种建模方式的椭球壳胀形过程的数值模拟,对比数值模拟和实验过程轴长变化规律,分析建模方式对模拟精度的影响。结果表明:在变形初期,3种建模方式的模拟精度相近,尺寸偏差均小于4%;但是在变形中后期,无焊缝模型的模拟精度较差,最大尺寸偏差达15%;粗略焊缝模型和完整焊缝模型都能较好地预测轴长的变化规律,且尺寸偏差不超过5%。综上所述,粗略焊缝模型既能简化建模方式,又能较好地预测椭球壳胀形过程轴长的变化规律。
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张伟玮
滕步刚
关键词 焊缝模型椭球壳液压胀形    
Abstract:In order to study the effect of weld seam models on hydro-forming of ellipsoidal shell, three kinds of models, i.e., comprehensive model rough model and no weld seam model were built and the influence was discussed on variation of axis length. An experiment for hydro-forming of ellipsoidal shell with initial axis length ratio 1.8 was first carried out, and the axis length varying with the increasing of internal pressure was obtained. Simulation on three kinds of finite element model was conducted, and the effect of weld seam models on the simulation accuracy was deeply discussed by a comparison of axis length variation between simulation and experiment. It is shown that little difference happens among the three kinds of weld seam models at the early stage of deformation, and the axis length deviation is less than 4%. However, there is worse simulation accuracy for the no weld seam model at the middle and late stage of deformation, and the axis length deviation is up to 15%. While both the comprehensive model and the rough model can successfully predict the axis length variation with the deviation no more than 5%. Finally, the rough model is selected on the basis of better simulation accuracy and simple weld seam model.
Key wordsweld seam model    ellipsoidal shell    hydro-forming
收稿日期: 2015-01-20      出版日期: 2017-03-22
中图分类号:  TG409  
通讯作者: 滕步刚(1969-),男,教授,博士生导师,主要从事塑性成形理论与塑性加工工艺研究,联系地址:黑龙江省哈尔滨市西大直街92号哈尔滨工业大学材料楼420室(150090),E-mail:bgteng@hit.edu.cn     E-mail: bgteng@hit.edu.cn
引用本文:   
张伟玮, 滕步刚. 椭球壳液压胀形过程焊缝建模方式的研究[J]. 材料工程, 2017, 45(3): 60-65.
ZHANG Wei-wei, TENG Bu-gang. Research on Weld Seam Models for Hydro-forming of Ellipsoidal Shell. Journal of Materials Engineering, 2017, 45(3): 60-65.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.000098      或      http://jme.biam.ac.cn/CN/Y2017/V45/I3/60
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