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On the Implementation and Evaluation of a Roughness Based Friction Model in FE Simulations of Sheet Metal Forming
Institutionen för material- och tillverkningsteknik, Tillverkningsteknik, Chalmers tekniska högskola.
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS).
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2006 (English)In: Proceedings of The 12th Nordic Symposium on Tribology, Lyngby: DTU Mechanical Engineering , 2006Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Lyngby: DTU Mechanical Engineering , 2006.
National Category
Tribology
Identifiers
URN: urn:nbn:se:hh:diva-16316ISBN: 87-90416-19-8 (print)OAI: oai:DiVA.org:hh-16316DiVA: diva2:443286
Conference
Nordtrib 2006 - 12th Nordic symposium on Tribology,Helsingör, Denmark, June 7-9, 2006
Available from: 2011-09-23 Created: 2011-09-23 Last updated: 2017-05-22Bibliographically approved
In thesis
1. Tribology of stamping: the influence of designed steel sheet surface topography on friction
Open this publication in new window or tab >>Tribology of stamping: the influence of designed steel sheet surface topography on friction
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Tribology is the science of friction, wear, and lubrication; the interaction of surfaces in relative motion. The tribological conditions in sheet metal forming influences the flow of material in forming operations, the strain distributions of sheet material, extent of wear, and thereby the quality of products. The purpose of the thesis is to increase the knowledge of why and how sheet surface topography influence the frictional response in stamping, to characterise the geometrical properties, and make results applicable for industry. The frictional response of different surface topographies have been measured in a Bending Under Tension test under mixed lubricated conditions. The studied materials have been stainless steel sheets and uncoated and coated carbon steel sheets. The results did show the influence of roughness, skewness, and anisotropy of surface topography. The findings could be explained by the theory of pad bearings. A new functional 3D parameter (Sq>0) was developed for pressing performance that is sensitive to the effects of roughness and skewness. The texture-aspect ratio parameter (Str) was found to be correlated to the anisotropical behaviour of the frictional response. The results are very tangible and mean increased control of stamping operations. An initial step was taken to introduce more advanced tribological models in FE simulation of sheet metal forming operations. The aim is to decrease the trial-and-error time in the design process of dies and tools. A friction model considering surface topography (Sq>0), sliding velocity, lubricant viscosity, and apparent pressure, was successfully implemented. Simulations of a part were evaluated with real stamping tryouts. The results did show the potential of improving the precision in forming simulations with more advanced tribological models. Finally, theory and characterisation methods of active micro-oil pockets in the contact zone of tool and sheet were investigated. The real contact area was shown to be the critical feature to determine. Therefore, two topographical methods and one microscope-imaging processing technique were studied, but no method was found to be viable. However, the experimental results did not confirm the importance of microoil pockets in mixed lubricated regime.

Place, publisher, year, edition, pages
Göteborg: Chalmers tekniska högskola, 2006. 72 p.
Series
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie, ISSN 0346-718X ; 2526
Keyword
steel sheet, tribology, surface topography
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hh:diva-2010 (URN)2082/2405 (Local ID)91-7291-844-6 (ISBN)2082/2405 (Archive number)2082/2405 (OAI)
Public defence
(English)
Available from: 2008-10-06 Created: 2008-10-06 Last updated: 2013-01-07Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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