Thermal energy generation and distribution in friction stir welding of aluminum alloys
Thermal energy generation and distribution in friction stir welding of aluminum alloys
复制标题
DOI：
10.1016/j.energy.2014.09.045
复制
发表时间：
2014-12-01
期刊：
影响因子：
9
通讯作者：
Rethmeier, M.
中科院分区：
文献类型：
--
作者：
Su, H.;Wu, C. S.;Rethmeier, M.
搅拌摩擦焊过程中热能产生及分布的准确预测对于工艺参数的优化以及潜在机制的理解具有重要意义。在本研究中，提出了一种综合计算与测量的新方法，以获得更合理的摩擦系数和滑移率的值，这两个值均用于表征刀具 - 工件接触界面处的发热率。建立了一个三维模型，以充分耦合铝合金搅拌摩擦焊中的能量产生、热传递和材料流动。界面摩擦和塑性变形产生的能量都被考虑在内。提高了热能产生及分布的分析精度，并阐明了刀具附近热能密度的分布特征。某些位置的预测峰值温度值与实验测量值相符。（C）2014爱思唯尔有限公司。保留所有权利。
The accurate prediction of the thermal energy generation and distribution in friction stir welding process is of great significance for the optimization of the process parameters and the understanding of the underlying mechanisms. In this study, a new method of integrative calculation and measurement is proposed to obtain the more reasonable values of the frictional coefficient and the slip rate, which are both used to characterize the heat generation rate at the tool-workpiece contact interfaces. A three-dimensional model is established to fully couple the energy generation, heat transfer and material flow in friction stir welding of aluminum alloys. The energy produced by both interfacial friction and plastic deformation are taken into consideration. The analysis accuracy of the thermal energy generation and distribution is improved, and the distribution features of thermal energy density in the vicinity of the tool are elucidated. The predicted peal temperature values at some locations are in agreement with the experimentally measured ones. (C) 2014 Elsevier Ltd. All rights reserved.