A new calculating method of frictional heat and its application during friction stir welding

•Specifically analyzing of friction generating heat from the microscopic level is done.•A new calculating method of frictional heat is established.•Frictional heat is affected by area coefficient c, fractal dimension D and scale factor G.•The effects of c, D and G on frictional heat are obtained. Fr...

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Bibliographic Details
Published in:Applied thermal engineering 2019-05, Vol.153, p.250-263
Main Authors: Yan, Fang, Zhang, YuCun, Fu, XianBin, Li, Qun, Gao, JunHua
Format: Article
Language:English
Subjects:
Asperities
Effects
Fractal geometry
Fractal theory
Friction
Friction generating heat
Friction stir welding
Heat
Kinematics
Mathematical analysis
Motion systems
R&D
Research & development
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Summary:•Specifically analyzing of friction generating heat from the microscopic level is done.•A new calculating method of frictional heat is established.•Frictional heat is affected by area coefficient c, fractal dimension D and scale factor G.•The effects of c, D and G on frictional heat are obtained. Friction exists between two objects contacting with each other in relative motion. Friction generating heat is a common acting form of friction. However, with the increasing understanding of friction generating heat, the researchers realize that the accurate calculation of frictional heat can’t be obtained only from the macroscopic level. Therefore, specifically analyzing of friction generating heat is of great significance for research and development of friction generating heat phenomena from the microscopic level. In this paper, from the microscopic level, a new calculating method of frictional heat based on fractal theory is proposed. The expression of frictional force in the motion system is derived based on the kinematics analysis and contact mechanics analysis of a pair of contact asperities on the micro-contact surface. Frictional heat is affected by the three parameters of this expression. To verify the validity, the method proposed in this paper is applied to the friction generating heat in the process of friction stir welding. Based on the new method, the frictional heat during friction stir welding is simulated by COMSOL Multi-physics software. The effects of area coefficient c, fractal dimension D and scale factor G on frictional heat are obtained. The validity of this new calculating method of frictional heat is verified.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2019.01.087