Modeling of Dual Phase Steel Plastic Deformations of Car Body Repair

There was developed a phenomenological model of dual phase steel DP 780 behavior with accounting changing in deformation direction. The model was built based on a two surface theory of plasticity and takes into account the kinematic (Baushinger effect) and isotropic hardenings. There was proposed the combined Hollomon and Hokket-Sherby rule for a describing isotropic hardening. Using the finite element analysis the model allows to evaluate the repaired car body's passive safety and to increase the accuracy of an incident restoration.

References

[1] Chaboche J.L. Constitutive-Equations for Cyclic Plasticity and Cyclic Viscoplasticity. International Journal of Plasticity, 1989, no. 5, pp. 247—302.

[2] Zang S.L., Guo C. A constitutive model for spring-back prediction in which the change of Young`s modulus with plastic deformation is considered. International Journal of Machine Tools and Manufacturing, 2007, no. 47, pp. 1791—1797.

[3] Eggertsen P.A., Mattiassou K. On the modeling of the bending-un bending behavior for accurate springback predictions. International Journal of Mechanical Sciences, 2009, no. 51, pp. 547—563.

[4] Cleveland R.M. , Ghosh A.K. Inelastic effects on springback in metals. International Journal of Plasticity, 2002, no. 18, pp. 769—785.

[5] Perez R., Benito S.A., Prado J.M. Study of the inelastic response of TRIP s teel s af ter plas t ic deformat ion. Isij International, 2005, no. 45, pp. 1925—1933.