PSI - Issue 2_B

Fuminori Yanagimoto et al. / Procedia Structural Integrity 2 (2016) 395–402 Author name / Structural Integrity Procedia 00 (2016) 000–000

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because of curved crack front shape and formation of shear lips near the surface of steel plates due to the decreased stress. Considering above, our study tried to use side grooved specimen in which the running crack front shape was straight and perpendicular to the direction of the crack propagation because of stress concentration caused by side groove and evaluated the local fracture stress during brittle crack running by FEM analysis more accurately. This study showed the local fracture stress is higher in low temperature than in high temperature. This trend can be explained in the aspect of energy absorption by microscopic plastic work due to tear ridge formation, which is the main mechanism to absorb energy during the cleavage crack propagation. Further experiments and discussions are needed to investigate the relationship between temperature and the local fracture stress in detail. Especially, it could be needed to find the suitable way to take the microscopic energy absorption into consideration on macroscopic FE analyses to obtain accurate values of stresses. Acknowledgements Part of this study was financially supported by Nippon Kaiji Kyokai (classNK), JSPS KAKENHI Grant Number 15H06661 and ISIJ. The authors would like to thank them. The experiments in this study were helped by Kashima Unit, Nippon Steel & Sumikin Technology Co., Ltd. The authors would express thank to its cooperation. References Berdin, C., Hajjaj, M., Bompard, P., Bugat, S., 2008. Local approach to fracture for cleavage crack arrest prediction, Engineering Fracture Mechanics 75, 3264-3275 Broberg, K.B., 1999. Cracks and Fracture, Academic Press Dassault Systemes.,2014. SIMULIA Abaqus Analysis User's Manual Version 6.14 Hajjaj, M., Berind, C., Bompard, P., Bugat, S.,2008. Analyses of cleavage crack arrest experiments: influence of specimen vibration. 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