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Formability Investigation for Perforated Steel Sheets
- M. Hossein Sehhat - Missouri University of Science and Technology, Department of Mechanical and Aerospace Engineering, USA ,
- Ali Mahdianikhotbesara - University of Tehran, School of Mechanical Engineering, College of Engineering, Iran ,
- Mohammadjafar Hadad - University of Tehran, School of Mechanical Engineering, College of Engineering, Iran
Journal Article
05-15-02-0012
ISSN: 1946-3979, e-ISSN: 1946-3987
Sector:
Topic:
Citation:
Sehhat, M., Mahdianikhotbesara, A., and Hadad, M., "Formability Investigation for Perforated Steel Sheets," SAE Int. J. Mater. Manf. 15(2):175-186, 2022, https://doi.org/10.4271/05-15-02-0012.
Language:
English
Abstract:
One of the unique characteristics of sheet metals is their formability, which is
determined by the forming limit diagrams (FLDs). These diagrams specify the
maximum deformation limit before part failure. For several applications of metal
sheets, they have to be in the perforated format. The existence of holes in the
perforated sheets may adversely deteriorate the forming limit of metal sheets.
In this study, the effect of perforated sheets’ hole size and hole layout on
their formability are investigated. Several specimens of St12 steel with 0.6 mm
thickness, different widths, two various hole sizes of 2 mm and 4 mm, and two
layouts of triangular and square arrangements were prepared. The specimens were
tested using the Nakajima test (stretch with a hemispherical punch) to generate
the FLDs. It was observed that both the diameter and layout of the punched holes
have a significant effect on the formability of the perforated sheets. The
perforated sheets with a triangular hole layout showed higher forming limits due
to their larger ligament ratios.