椭球壳液压胀形过程焊缝建模方式的研究

发布时间：2018-04-06 04:35

本文选题：焊缝模型　切入点：椭球壳　出处：《材料工程》2017年03期

【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。
[Abstract]:In order to study the influence of the finite element modeling method on the axial length variation of ellipsoid shell during bulging, three kinds of weld modeling methods are proposed: complete weld model, rough weld model and non-weld model.Firstly, the hydraulic bulging of ellipsoidal shell with an initial axial length ratio of 1.8 is studied, and the variation of axial length with internal pressure is obtained.Secondly, the numerical simulation of the bulging process of ellipsoid shell with three modeling methods is carried out, and the influence of the modeling method on the simulation accuracy is analyzed by comparing the variation of axial length between the numerical simulation and the experimental process.The results show that the simulation accuracy of the three modeling methods is similar and the dimension deviation is less than 4 in the early stage of deformation, but in the middle and late stage of deformation, the simulation accuracy of the weldless model is poor.The maximum dimension deviation is 15. Both the rough weld model and the complete weld model can predict the variation of shaft length, and the dimension deviation is not more than 5.In conclusion, the rough weld model can not only simplify the modeling method, but also predict the variation law of axial length in the bulging process of ellipsoid shell.
【作者单位】：哈尔滨工业大学材料科学与工程学院;哈尔滨工业大学金属精密热加工国家重点实验室;
【基金】：长江学者和创新团队发展计划资助(IRT1229)
【分类号】：TG394

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