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Identification of Out-of-Plane Material Characteristics through Sheet-Metal Blanking
 
Š. Bolka, J. Slavič and M. Boltežar
Identification of Out-of-Plane Material Characteristics through Sheet-Metal Blanking
Journal of Mechanical Engineering 61(2015)4, 217-226 
download pdf   more   dx.doi.org/10.5545/sv-jme.2014.2302
Abstract
The mechanical characteristics of sheet metals are typically identified in the in-plane direction, although the sheet-metal forming processes (e.g., blanking, deep-drawing) are normally applied in the out-of-plane direction. As the mechanical characteristics are not necessarily constant, their direct experimental evaluation through the forming process would enable material monitoring and process optimization, and, additionally, material characterization in the out-of-plane direction. Full, partial (to a certain depth) and sequential (consecutive partial steps to full penetration) blanking experiments are performed on a laboratory blanking apparatus to correlate the out-of-plane material characteristics with the in-plane ones. The well-established in-plane approach to damage is introduced for the out-of-plane direction to determine the isotropic Lemaitre damage variable. Furthermore, yield and ultimate shear stresses are determined and correlated to their respective in-plane counterparts, offering a new insight in the sheet-metal blanking process.
Authors
 
 
R&D
Špela Bolka,PhD
Hidria Rotomatika, d.o.o.
spela.bolka@hidria.com    ⌂ ladisk.si/~bolka/
☏ +386 1 4771 229     
  
 
Associate Professor
Janko Slavič,PhD
Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
janko.slavic@fs.uni-lj.si    ⌂ ladisk.si/~slavic/
☏ +386 1 4771 226   jankoslavic   jankoslavic
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Professor
Miha Boltežar,PhD
Ladisk, Faculty of Mechanical Engineering, University of Ljubljana
miha.boltezar@fs.uni-lj.si    ⌂ ladisk.si/~boltezar/
☏ +386 1 4771 608     
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