PSI - Issue 13

Yuta Suzuki et al. / Procedia Structural Integrity 13 (2018) 1221–1225 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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4. Conclusion

In this study, the relation between grain size which was the most basic characteristic of microstructures and cleavage crack propagation resistance was evaluated by experiments and numerical analysis model development. From the macroscopic arrest toughness tests, it was found that the crack resistance tended to increase for steels which had large grain size. In the cleavage crack propagation model, the fracture surface corresponding the tear-ridge was reproduced, the absorbed energy was quantitatively derived from the formula based on the experimental result. As a result, on the both sides of experiments and numerical calculations by model, the results showed that the cleavage crack propagation resistance was larger for steels with larger grain size. References F. Yanagimoto, K. Shibanuma, K. Suzuki, T. Matsumoto, S. Aihara, Local stress in the vicinity of the propagating cleavage crack tip in ferritic steel, Materials & Design, Vol.144, pp.361-373, 2018. K. Shibanuma, Y. Suzuki, K. Kiriyama, T. Hemmi, H. Shirahata, A numerical simulation model of microscopic cleavage crack propagation based on 3D XFEM, ECF22_364 K. Shibanuma, Y. Yamamoto, F. Yanagimoto, K. Suzuki, S. Aihara, Multiscale Model Synthesis to Clarify the Relationship between Microstructures of Steel and Macroscopic Brittle Crack Arrest Behavior - Part I : Model Presentation. ISIJ Int. 56, 341 – 349. doi:10.2355/isijinternational.ISIJINT-2015-450, 2016. N. Moës, A. Gravouil, T. Belytschko, Non-planar 3D crack growth by the extended finite element and level sets, International Journal for Numerical Methods in Engineering, Vol.53, pp.2549-2568, 2002. S. Aihara, Y. Tanaka, A simulation model for cleavage crack propagation in bcc polycrystalline solids, Acta Materialia, Vol.59, pp.4641 4652, 2011. SIMULIA, 2014. Abaqus Analysis User’s Guide Version 6.14. Dassault Systemes. V.F. Gonzalez-Albuixech, E. Giner, J.E. Tarancon, F.J. Fuenmayor, A. Gravouil, Domain integral formulation for 3- D curved and non planar cracks with the extended finite element method, Computational Methods in Applied Mechanics and Engineering, Vol.264, pp.129-144, 2013. Y. Yamamoto, K. Shibanuma, F. Yanagimoto, K. Suzuki, S. Aihara, Multiscale Model Synthesis to Clarify the Relationship between Microstructures of Steel and Macroscopic Brittle Crack Arrest Behavior - Part II : Application to Crack Arrest Test. ISIJ Int. 56, 350 – 358. doi:10.2355/isijinternational.ISIJINT-2015-450, 2016.