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The effect of stress states on micromechanical damage modeling of dual phase steels.

By Javad Kadkhodapour (Shahid Rajaee Teacher Training University)
Co-authors: Ali Cheloee Darabi (Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran)
Ali Pourkamali Anaraki (Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran)
Hossein Pourfarzaneh (Sharif university of technology lecturerer, Tehran, Iran)
Hamidreza Chamani (Fatigue and Fracture Lab., Center of Excellence in Experimental Solid Mechanic and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16846, Tehran, Iran.)
Siegfried Schmauder (Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), University of Stuttgart, Stuttgart, Germany)


Dual phase (DP) steels have intricate behaviors because of the interaction between ferrite and martensite phases in their complex microstructure. The damage mechanism and the relation between their strength and ductility are the most important objectives in their applications. In this study, the 2D and 3D representative volume elements (RVEs) were generated based on the microstructure of DP800 using image processing code in MATLAB, and were analyzed using ABAQUS FEA software. To describe damage failure, The Gurson-Tvergaard-Needleman (GTN) damage model was used in ferrite phases and the failure in the martensite phases was assumed to be non-existent. Different macroscopic tests with several stress states (Stress triaxiality and Lode angle) were performed. The results were used to calibrate the GTN damage model parameters and to validate the results of damage model. This micromechanical damage model is used to: (1) describe damage initiation and growth mechanisms in RVEs under different stress states, (2) predict stress-strain curve under a wide range of stress triaxiality and Lode angle parameters. Damage initiation and growth mechanisms are validated using experimental observations by scanning electron microscopy (SEM) and macro sample test results, and predicted stress-strain curves are validated by comparing them to experimental results. The numerical results revealed good agreement with experimental data. Keywords: Dual phase (DP) steels, Micromechanical modeling, Stress State, GTN damage model

Ⓒ Photos:Toerisme Leuven