Laboratory for Dynamics of Machines and Structures 
Identification of Out-of-Plane Material Characteristics through Sheet-Metal Blanking
 Š. Bolka, J. Slavič and M. Boltežar
Journal of Mechanical Engineering 61(2015)4, 217-226

download pdf   http://dx.doi.org/10.5545/sv-jme.2014.2302
Povzetek
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

Technology and HLS Manager

Špela Bolka, dr.

  Hidria, d.o.o.
  spela.bolka@hidria.com
  

Profesor

Janko Slavič, dr.

  Ladisk, Fakulteta za strojništvo, Univerza v Ljubljani
  janko.slavic@fs.uni-lj.si
  +386 1 4771 226
jankoslavic     jankoslavic    
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Profesor

Miha Boltežar, dr.

  Ladisk, Fakulteta za strojništvo, Univerza v Ljubljani
  miha.boltezar@fs.uni-lj.si
  +386 1 4771 608
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