• CN：11-2187/TH
• ISSN：0577-6686

• 材料科学与工程 •

### 基于材料流动轨迹的搅拌摩擦焊接晶粒及焊接区大小预测模型

1. 1.大连理工大学工程力学系
2.大连理工大学工业装备结构分析国家重点实验室
• 出版日期:2015-01-20 发布日期:2015-01-20
• 基金资助:
国家自然科学基金(11172057)、中央高校基本科研业务费专项资金和教育部新世纪优秀人才支持计划(NCET-12-0075)资助项目

### Computational Model for Predictions on Welding Zones and Grain Sizes Based on the Flow Trace in Friction Stir Welding

ZHANG Zhao1, 2WU Qi1, 2

1. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024;State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024
• Online:2015-01-20 Published:2015-01-20

Abstract: Coupled thermo-mechanical model is used to simulate the material flow in friction stir welding(FSW) The flow traces are studied for the determination of the stirring zone(SZ) and the thermo-mechanical affected zone(TMAZ). The histories of the true strain rate and the temperature on the boundaries of the SZ and the TMAZ are given to calculate the Zener-Holloman parameter and the grain sizes. The comparison to the data in published literature shows the validity of the current model. Results indicate that uniform temperature can lead to uniform lgZ in the SZ, although the distribution of the strain rate is not uniform. This means that the effect of temperature on the grain sizes is much more important than the effect of the strain rate. The strain rates of the material particles in rotation with pin can reach 22 s–1. The boundaries of the SZ and TMAZ can be determined by the different material flow rules of different traced particles. The SZ and the grain sizes are both increased with the increase of the shoulder diameter. Smaller shoulder can lead to smaller SZ.