Abstract
In metal forming processes, contact mechanics in the tool-workpiece interfaces determine the resulting friction and thus influence the quality and stability of the process. In models representing dry, thin film and boundary lubrication
conditions in metal forming, friction may be assumed proportional to the ratio of the real contact area to the apparent contact area. It is therefore important to obtain a fundamental understanding of as many of factors influencing asperity
flattening as possible. This paper presents asperity flattening of pyramidal model asperities loaded normally by a plane tool. The experiments are performed in a recently developed test setup, which allows for different in-plane strain ratios in
combination with the normal load. The in-plane deformation is known, through the yield criterion, to influence the necessary yield pressure to flatten the asperities and hence the resulting real contact area. In-plane balanced biaxial stretching is
shown to result in further asperity flattening than plane strain. When comparing to previous results, it is shown that in-plane strains reduce the effect of the asperity shape on the resulting real contact area ratio.
conditions in metal forming, friction may be assumed proportional to the ratio of the real contact area to the apparent contact area. It is therefore important to obtain a fundamental understanding of as many of factors influencing asperity
flattening as possible. This paper presents asperity flattening of pyramidal model asperities loaded normally by a plane tool. The experiments are performed in a recently developed test setup, which allows for different in-plane strain ratios in
combination with the normal load. The in-plane deformation is known, through the yield criterion, to influence the necessary yield pressure to flatten the asperities and hence the resulting real contact area. In-plane balanced biaxial stretching is
shown to result in further asperity flattening than plane strain. When comparing to previous results, it is shown that in-plane strains reduce the effect of the asperity shape on the resulting real contact area ratio.
Original language | English |
---|---|
Title of host publication | Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity (ICTP 2023) |
Editors | K. Mocellin, PO. Bouchard, R. Bigot, T. Balan |
Place of Publication | Cham |
Publisher | Springer |
Publication date | 2023 |
Pages | 12-19 |
ISBN (Print) | 978-3-031-40919-6 |
ISBN (Electronic) | 978-3-031-40920-2 |
DOIs | |
Publication status | Published - 2023 |
Event | International Conference on the Technology of Plasticity - Mandelieu-La, France Duration: 24 Sept 2023 → 29 Sept 2023 |
Conference
Conference | International Conference on the Technology of Plasticity |
---|---|
Country/Territory | France |
City | Mandelieu-La |
Period | 24/09/2023 → 29/09/2023 |
Series | Lecture Notes in Mechanical Engineering |
---|---|
ISSN | 2195-4356 |
Keywords
- Sheet metal forming
- Friction
- Asperity flattening
- Pyramidal asperities