PSI - Issue 13

Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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Kota Kishi et al. / Procedia Structural Integrity 13 (2018) 1111–1116

1116

When the local mesh size is 1.250 mm or 1.000 mm, the range of error is large. On the other hand, when local mesh size is 0.833mm, 0.714mm or 0.625mm, the range of error is small. It shows that the local mesh size affects the accuracy and this is the same as the static problem. Also, as velocity is higher, the accuracy becomes worse. 5. Conclusion In this study, as the numerical analysis method to develop the model on brittle crack propagation based on the local fracture stress criterion, the mesh superposition method is focused on and the experiments on static crack problems and dynamic crack problems are performed. Due to the experiments of static crack problems, it is showed that mesh superposition method is applicable to static crack analysis. In addition, the local mesh size influence accuracy more than global mesh size. Due to the experiments of dynamic crack problems, it is showed that mesh superposition method is also applicable to dynamic crack problems and the basic theory on the local fracture stress criterion is developed. Acknowledgement This study was partly supported by JSPS KAKENHI grant numbers 17H01354, 18H03811 in financial manners. The authors express thanks to them. References Kazuki Shibanuma, Fuminori Yanagimoto, Tetsuya Namegawa, Katsuyuki Suzuki, Shuji Aihara: Brittle crack propagation/arrest behavior in steel plate-Part I: Model formulation, Engineering Fracture Mechanics, Vol.162, pp.324-340, 2016 Kazuki Shibanuma, Fuminori Yanagimoto, Tetsuya Namegawa, Katsuyuki Suzuki, Shuji Aihara: Brittle crack propagation/arrest behavior in steel plate-Part II: Experiments and model validation, Engineering Fracture Mechanics, Vol.162, pp.341-360, 2016 F. Yanagimoto, K. Shibanuma, Y. Nishioka, Y. Shirai, K. Suzuki, T. Matsumoto: Local stress evaluation of rapid crack propagation in finite element analyses, International Journal of Solids and Structures, Vol.144, pp.361-373, 2018 J. Fish, The s-version of the finite element method, Comput. Struct. 43 (1992) 539 – 547. doi:10.1016/0045-7949(92)90287-A. K.B. Broberg, Cracks and Fracture, Academic Press, 1999.