Abstract—Dual phase steels are gaining a wide array of applications in the automotive engineering fields and can be subjected to forming/stamping process due to their good mechanical properties. However, it shows complex damage mechanism resulting intricate prediction of sheet formability. In this study, the mechanical Gurson-Tvergaard-Needleman (GTN) model was used to develop Damage Curve due to the GTN model is the micromechanical damage which is widely used for predict formability of Dual Phase steel by calculating the evolution of voids in the matrix. To adequate calibration of GTN parameters were defined by sufficiently comparative method between mechanical behaviors and numerical analysis, however, the accuracy of determined parameters was verified by different stress states on the tensile test of different specimen together with numerical simulation. The accurate results show a good agreement of force-displacement response. On the part of the damage curve development, it uses Hybrid method by considering tensile tests of various sample geometries. The results showing the relation between the equivalent strain to localized necking and an initial crack of versus the stress triaxialities represented that the GTN model and others criteria directly effect on all range of stress triaxialities. 
 

Index Terms—damage curve, dual phase steels, GTN model, numerical analysis

Cite: Chananya Netrasiri and Surasak Suranuntchai, "Damage Curve Determination of Dual Phase Steel Based on GTN Mode-l Failure Criteria," International Journal of Mechanical Engineering and Robotics Research, Vol. 5, No. 4, pp. 268-271, October 2016. DOI: 10.18178/ijmerr.5.4.268-271