Modelling of size effects on behavior of thin sheet metals for bipolar plate manufacturing

Muammer Koç, Sasawat Mahabunphachai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The grain-to-feature size ratio in micro-forming processes is predicted to have a vital impact on the material behavior in addition to the well-known effect of the grain size itself as manifested by the Hall-Petch relation. In this study, the "size effects" on the material flow curve of thin sheet metals under hydraulic bulge testing conditions were investigated. The ratio of the sheet thickness to the material grain size (N = t0/d) was used as a parameter to characterize the interactive effects between the specimen and the grain sizes at the micro-scales, while the ratio of the bulge die diameter to the sheet thickness (M = Dc/t0) was used to represent the effect of the feature size in the bulge test. A systematic approach for determining the flow curve of thin sheet metals in bulge testing was discussed and presented. The results of the bulge tests at different scales showed a decrease in the material flow curve with a decrease in N and/or M values. New material models were developed to explain the changes in the material flow curve caused by the size effects. The explanation and prediction of the flow curve based on these models were shown to be in good agreement with the bulge test results in this study and in the literature.

Original languageEnglish
Title of host publicationTMS 2013 - 142nd Annual Meeting and Exhibition, Supplemental Proceedings: Linking Science and Technology for Global Solutions
Pages745-752
Number of pages8
Publication statusPublished - 2013
Externally publishedYes
Event142nd Annual Meeting and Exhibition: Linking Science and Technology for Global Solutions, TMS 2013 - San Antonio, TX, United States
Duration: 3 Mar 20137 Mar 2013

Other

Other142nd Annual Meeting and Exhibition: Linking Science and Technology for Global Solutions, TMS 2013
CountryUnited States
CitySan Antonio, TX
Period3/3/137/3/13

Fingerprint

metal sheets
Sheet metal
manufacturing
curves
grain size
hydraulics
Testing
Hydraulics
predictions

Keywords

  • Bipolar plate
  • Fuel cell
  • Micro-channels
  • Micro-forming
  • Size effects

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Cite this

Koç, M., & Mahabunphachai, S. (2013). Modelling of size effects on behavior of thin sheet metals for bipolar plate manufacturing. In TMS 2013 - 142nd Annual Meeting and Exhibition, Supplemental Proceedings: Linking Science and Technology for Global Solutions (pp. 745-752)

Modelling of size effects on behavior of thin sheet metals for bipolar plate manufacturing. / Koç, Muammer; Mahabunphachai, Sasawat.

TMS 2013 - 142nd Annual Meeting and Exhibition, Supplemental Proceedings: Linking Science and Technology for Global Solutions. 2013. p. 745-752.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Koç, M & Mahabunphachai, S 2013, Modelling of size effects on behavior of thin sheet metals for bipolar plate manufacturing. in TMS 2013 - 142nd Annual Meeting and Exhibition, Supplemental Proceedings: Linking Science and Technology for Global Solutions. pp. 745-752, 142nd Annual Meeting and Exhibition: Linking Science and Technology for Global Solutions, TMS 2013, San Antonio, TX, United States, 3/3/13.
Koç M, Mahabunphachai S. Modelling of size effects on behavior of thin sheet metals for bipolar plate manufacturing. In TMS 2013 - 142nd Annual Meeting and Exhibition, Supplemental Proceedings: Linking Science and Technology for Global Solutions. 2013. p. 745-752
Koç, Muammer ; Mahabunphachai, Sasawat. / Modelling of size effects on behavior of thin sheet metals for bipolar plate manufacturing. TMS 2013 - 142nd Annual Meeting and Exhibition, Supplemental Proceedings: Linking Science and Technology for Global Solutions. 2013. pp. 745-752
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