PSI - Issue 42

8

Tuncay Yalc¸inkaya et al. / Structural Integrity Procedia 00 (2019) 000–000

Tuncay Yalçinkaya et al. / Procedia Structural Integrity 42 (2022) 1651–1659

1658

(Avg: 75%) S, Mises

1108 1267 1425 1583 1742 1900 3347

0 158 317 475 633 792 950

Fig. 4: Von Mises Stress distributions of VF37-Morph1-Oriset1 (Left), VF37-Morph1-Oriset2 (Middle), VF37-Morph1-Oriset3 (Right).

orientation set, which is very intuitive. Fig. 4 shows the Von Mises stress distribution at the same cross-section and instant for each orientation set. The left RVE shows a complete decohesion, whereas decohesion of the right RVE just initiates; in contrast, the middle RVE is still perfectly intact. As one of the most important microstructural parameters, the orientation distributions influence greatly the the crack initiation, growth, and propagation.

5. Conclusions and Outlook

This study presents an initial attempt in addressing the microstructure evolution, constitutive response, and failure in three dimensional dual phase steel microstructures through polycrystalline RVEs using J 2 and crystal plasticity frameworks as well as cohesive zone and ductile damage models. Analyses are performed for different volume frac tions and orientation sets under uniaxial tensile loading conditions. The study explicitly shows the orientation set, and the volume fraction dependent plasticity, damage and fracture behavior of DP steels at the microstructure scale. The current study stands at the qualitative analysis level, and is not calibrated to any specific material employing experiments. However, the combination of physics-based plasticity frameworks with suitable failure models offers to obtain realistic results in three dimension. Such a framework at this length scale can be employed for microstructure analysis and design once tested against experiments. As a next step, the analysis will be extended to isotropic RVEs with higher number of ferrite grains and will involve other microstructural parameters. Moreover the intra-granular and inter-granular ferrite failure will be included as well. Acar, S.S., Bulut, O., Yalc¸inkaya, T. 2022. Crystal plasticity modeling of additively manufactured metallic microstructures. Procedia Structural Integrity 35, 219-227. Avramovic-Cingara, G., Ososkov, Y., Jain, M.K., Wilkinson, D.S. 2009. Effect of martensite distribution on damage behaviour in DP600 dual phase steels. Materials Science and Engineering A 516, 7-16. Ayatollahi, M., Darabi, A., Chamani, H., Kadkhodapour, J. 2016. 3D micromechanical modeling of failure and damage evolution in dual phase steel based on a real 2D microstructure. Acta Mechanica Solida Sinica 29 (1), 95–110. Bao, Y., Wierzbicki, T. 2004. On fracture locus in the equivalent strain and stress triaxiality space. International Journal of Mechanical Sciences 46 (1), 81-98. Cerrone, A., Wawrzynek, P., Nonn, A., Paulino, G.H., Ingraffea, A. 2014. Implementation and verification of the Park-Paulino-Roesler cohesive zone model in 3D. Engineering Fracture Mechanics 120, 26–42. Hosseini-Toudeshky, H., Anbarlooie, B., Kadkhodapour, J. 2015. Micromechanics stress–strain behavior prediction of dual phase steel considering plasticity and grain boundaries debonding. Materials and Design 68, 167-176. Huang, Y. 1991. A user-material subroutine incroporating single crystal plasticity in the abaqus finite element program. Mech Report 178. References