PT Journal
AU Slota, J
   Spisak, E
TI Determination of Forming - Limit Diagrams Considering Various Models for Steel Sheets
SO Acta Mechanica Slovaca
PY 2011
BP 56
EP 62
VL 15
IS 1
DI 10.21496/ams.2011.008
DE Forming-Limit Diagrams; Prediction Models; Sheet Metal Forming
AB In this paper a comparative investigation of three mathematical models (Marciniak - Kuczynski model, Swift-Hill model and Sing-Rao model) as well as on an empirical model proposed by the North American Deep Drawing Research Group (NADDRG) has been carried out. The yield criterion proposed by Hill is used for the calculation of the limit strains in connection with the Swift's instability condition for diffuse necking and by using the Marciniak - Kuczynski analysis. The emphasis of this investigation is to consider these different approaches to predicting the FLD. Experimental results has been carried out for low carbon steel sheets of drawing quality as well as rephosphorised, TRIP and micro-alloyed steels. It was compared, which theoretical model showing good correlation with experiment, thus, which model is suitable for materials mentioned above.
ER