A Constitutive Friction Law for Sheet-Bulk Metal Forming

A Constitutive Friction Law for Sheet-Bulk Metal Forming

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Friction has a significant effect on metal forming both in economic and technical terms.This is especially true for sheet-bulk metal forming, which is a combination of bulk metal forming and sheet metal forming.Contact loads of sheet forming processes are typically low to moderate.

In contrast, very high contact loads occur in bulk metal forming.Therefore, a friction law, Denim which is applicable for a broad range of contact loads, is necessary, if such a process has to be modelled accurately with the finite element method.A friction law fulfilling this demand is identified with the use of an elastic-plastic half-space model.

The half-space model is used to determine the normal contact of rough Computer Monitors surfaces and it is validated with experiments.In order to highlight the impact of the identified friction law, a typical sheet-bulk metal forming process is taken into account in the framework of the finite element method.