A first order friction model for lubricated sheet metal forming

•A first order friction model for sheet metal forming simulations is derived.•The friction model is based on local contact conditions. This paper presents the derivation of a first order friction model for lubricated sheet metal forming. Assuming purely plastic real contacts, Newton's law of vi...

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Bibliographic Details
Published in:Theoretical and applied mechanics letters 2018-01, Vol.8 (1), p.57-61
Main Author: Löfgren, Hans B.
Format: Article
Language:English
Subjects:
Friction model
Lubrication
Sheet metal forming
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Summary:•A first order friction model for sheet metal forming simulations is derived.•The friction model is based on local contact conditions. This paper presents the derivation of a first order friction model for lubricated sheet metal forming. Assuming purely plastic real contacts, Newton's law of viscosity, and a square root behavior of the hydrodynamic coefficient of friction with respect to the hydrodynamic Hersey parameter an analytic model is found. The model predicts the coefficient of friction as a function of the relative pressure, the relative Hersey parameter and the real contact coefficient of friction. Questions about local and global friction are raised in the validation of the model against flat tool sheet experiments. For some flat tool sheet experiments reasonable agreements are obtained assuming a rigid punch pressure distribution. The restricted number of user inputs makes the model useful in early tool design simulations.
ISSN:2095-0349
DOI:10.1016/j.taml.2018.01.002