mk-fld

A MATLAB program that use M-K model to calculate FLD and FLSD

M-K (Marciniak-Kuczyński) is widely used for predicting forming limit diagram (FLD) and forming limit stress diagram (FLSD). Banabic[1] has created a program called FORM-CERT for FLD calculation, but it is not open source. mk-fld is part of my undergraduate thesis project. Another part is bform, a database for blank forming.

mk-fld include the following functionalities

• calculate FLD and FLSD use built in constitutive equations (hardening law and yield functions).
• transform experimental FLD data to FLSD.
• A graphic user interface.
• import and export data in csv format.

mk-fld is made up of the following parts

• symbolic expressions for constitutive equations.
• function generators, transform symbolic expressions to numeric, prefixed with s2f.
• subroutines, fixed strain path, fixed groove orientation.

The code for FLD calculation is based on Butuc's paper[2] and FLSD part is based on another paper by Butuc[3].

Reference

• [1] Jurco, P., and D. Banabic. "A user-frienldy programme for calculating Forming Limit Diagrams." Proc. 8th ESAFORM Conference on Material Forming. Cluj-Napoca April. 2005.
• [2] Butuc, M. C., et al. "A more general model for forming limit diagrams prediction." Journal of materials processing technology 125 (2002): 213-218.
• [3] Butuc, M. C., J. J. Gracio, and A. Barata Da Rocha. "An experimental and theoretical analysis on the application of stress-based forming limit criterion." International Journal of Mechanical Sciences 48.4 (2006): 414-429.