PSI - Issue 13

Kazuki Shibanuma et al. / Procedia Structural Integrity 13 (2018) 1238–1243 Author name / Structural Integrity Procedia 00 (2018) 000–000

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4. Conclusion In the present study, we proposed a model for cleavage crack propagation in steel based on the extended finite element method (XFEM). In the proposed model, the geometry of the polycrystal was modeled independently from the finite element mesh, as well as the crack shape. As the fracture criterion of the cleavage crack propagation, the cleavage plane was formed on the {1 0 0} plane of the grain where the maximum normal stress was applied. As validation of the proposed model, the numerical simulation results of fracture surface morphology were compared with the SEM observation results obtained from the specimen of double cantilever beam (DCB) test using the ferrite pearlite steel. The result shows that the proposed model can successfully simulate complicated cleavage crack propagation behaviors, such as micro-branching and wraparound of cracks on the fracture surface. Acknowledgement This study was partly supported by JSPS KAKENHI grant number 17H01354 in financial manners. The authors express thanks to them. References Aihara, S., Tanaka, Y., 2011. A simulation model for cleavage crack propagation in bcc polycrystalline solids. Acta Materialia 59, 4641–4652. Anderson, T.L., 2017. Fracture Mechanics. Fourth Edi. Boca Raton: CRC Press. González-Albuixech, V.F., Giner E., Tarancón, J.E., Fuenmayor, F.J., Gravouil, A., 2013. Domain integral formulation for 3-D curved and non planar cracks with the extended finite element method. Computer Methods in Applied Mechanics and Engineering 264, 129–144. Handa, T., Igi, S., Endo, S., Tsuyama, S., Tagawa, T., Minami, F., 2012. Mechanism of brittle crack arrest toughness improvement due to texture. Tetsu-to-Hagane 98, 548–557. Moës, N., Gravouil, A., Belytschko, T., 2002. Non-Planar 3D crack growth by the extended finite element and level sets - Part I: Mechanical model. International Journal for Numerical Methods in Engineering 53, 2549–2568. Quey, R., Dawson, P.R., Barbe, F., 2011. Large-scale 3D random polycrystals for the finite element method: Generation, meshing and remeshing. Computer Methods in Applied Mechanics and Engineering 200, 1729–1745. Shirahata, H., Fujioka, M., Ushioda, K., 2018. Estimation of the effective grain size controlling brittle crack arrest toughness of high-strength steel. Tetsu-to-Hagane 104, 177–185. Tsuyama, S., Takeuchi, Y., Nishimura, K., Handa, T., 2012. Brittle crack propagation/arrest behavior of heavy gauge shipbuilding steels controlling the texture distribution in the thickness direction. Quarterly Journal of the Japan Welding Society 30, 188–195.