Forming Limit Diagrams of Ground St14 Steel Sheets with Different Thicknesses

Event
SAE 2012 World Congress & Exhibition
Authors Abstract
Content
The influence of sheet thickness on sheet metal forming limits is a controversial issue; while some investigations indicate the considerable influence of thickness on forming limit diagrams (FLDs), others suggest that it is of negligible importance. In the present work, it has been demonstrated that if the thickness-reduction process is chosen so as not to alter the micro structure of the material, the forming limits do not change with variations of thickness. A material which has extensive usage in sheet metal forming processes of automotive industry (St14) has been provided. The initial thickness of the sheet is 1.5mm and using grinding process (which does not alter the microstructure) the initial thickness is reduced to different thicknesses, namely 1 and 0.5mm. Afterwards, the FLDs for all three thicknesses were determined using standard test methods. The FLDs for specimens which were ground to various thicknesses differ slightly. This small difference is attributed to bending effects resulted from curvature of the punch. Thus, the results strongly support the conclusion that the absolute value of thickness has no influence on forming limits of St14 steel sheet.
Meta TagsDetails
DOI
https://doi.org/10.4271/2012-01-0018
Pages
5
Citation
Hashemi, R., Ghazanfari, A., Abrinia, K., and Assempour, A., "Forming Limit Diagrams of Ground St14 Steel Sheets with Different Thicknesses," Materials and Manufacturing 5(1):60-64, 2012, https://doi.org/10.4271/2012-01-0018.
Additional Details
Publisher
Published
Apr 16, 2012
Product Code
2012-01-0018
Content Type
Journal Article
Language
English