Abstract
Finite element (FE) simulation has been often used to optimize sheet metal forming process. In order to increase predictive capability for the formability and springback of sheet metals in the FE simulations, advanced numerical techniques and constitutive models have been regarded as critical issues and thus investigated by numerous researchers. However, most of the sheet metal forming simulations employed the Coulomb friction law with a constant value, which in fact is known to be a function of contract pressure, surface quality and sliding velocity. In this study, the asperity based friction model proposed by Westeneng [1], as one of most promising microscale models, was investigated and evaluated by introducing different contact assumptions. Modified friction model was evaluated for estimating the friction coefficient under different variables influencing the frictional condition.
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