Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 20, No. 1 (February 2007) 55-66   

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  THE PERFORMANCE OF KARAFILLIS-BOYCE YIELD FUNCTION ON DETERMINATION OF FORMING LIMIT DIAGRAMS
 
M. Ganjiani and A. Assempour٭

Department of Mechanical Engineering, Sharif University of Technology
Azadi Avenue P.O. Box 11365-9567, Tehran, Iran
assem@sharif.edu


*Corresponding Author

 
( Received: June 25, 2006 – Accepted in Revised Form: January 18, 2007 )
 
 

Abstract    Forming Limit Diagrams are useful tools for evaluation of formability in the sheet metals. In this paper the effects of yield criteria on predictions of the right and left-hand sides of forming limit diagrams (FLDs) are investigated. In prediction of FLD, Hosford 1979, “Karafillis-Boyce” (K-B) and BBC2000 anisotropy yield functions have been applied. Whereas the prediction of FLD is based on the “Marciniak and Kuczynski” model, thus a numerical approach using the Newton-Raphson method has been used. Forming Limit Diagrams have been obtained for Al 6111-T4 and AA5XXX alloys and results have been compared with published experimental data. Results indicate that predictions of FLD are very sensitive to selection of yield criterion. Also it was found that the FLD of K-B yield function has a better agreement than that by other yield criteria.

 

Keywords    Marciniak and Kuczynski Model, Karafillis and Boyce, Hosford 1979, BBC2000, Yield Function, Newton-Raphson Method

 

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