PSI - Issue 13

Fuminori Yanagimoto et al. / Procedia Structural Integrity 13 (2018) 2095–2100 Author name / Structural Integrity Procedia 00 (2018) 000–000

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4. Conclusion In order to clarify the mechanics of brittle crack propagation and arrest behaviors in 3D structures, high speed observation of crack front shape was carried out using transparent PMMA. The observation showed that the whether crack front shape kept semi-elliptical shape was significant for the 3D crack arrest design. When the flange was thin, the crack front contacted with the lower surface of the flange and became through crack to continue to propagate. On the other hand, in the thick flange, the crack front shape could kept semi-elliptical shape and arrest in flange. As shown the above observation, it is meaningful to consider crack front-structural factor relationship to improve structural crack arrest design. Acknowledgement Design of jigs and specimens for the present experiments was carried out under some advices from Mr. Takumi Ozawa in National Maritime Research Institute in Japan. This study was partly supported by JSPS KAKENHI grant number 15H0661 and 18H03811 in financial manners. The authors express thanks to them. References Ayatollahi, M.R., Rashidi Moghaddam, M., Razavi, S.M.J., Berto, F., 2016. Geometry effects on fracture trajectory of PMMA samples under pure mode-I loading. Eng. Fract. Mech. 163, 449–461. doi:10.1016/j.engfracmech.2016.05.014 Dally, J.W., Fourney, W.L., Irwin, G.R., 1985. On the uniqueness of the stress intensity factor - crack velocity relationship. Int. J. Fract. 27, 159–168. doi:10.1007/BF00017965 Grégoire, D., Maigre, H., Combescure, A., 2009. New experimental and numerical techniques to study the arrest and the restart of a crack under impact in transparent materials. Int. J. Solids Struct. 46, 3480–3491. doi:10.1016/j.ijsolstr.2009.06.003 Handa, T., Igi, S., Oi, K., Nishimura, K., Tagawa, T., Minami, F., 2014. Brittle Crack Propagation/Arrest Behavior in Full Penetration T-joint. J. Japan Soc. Nav. Archit. Ocean Eng. 19, 179–185. Handa, T., Igi, S., Oi, K., Tagawa, T., Minami, F., 2015. Brittle crack propagation / arrest behavior in T-joint structure of heavy gauge steel plate. Weld. World 59, 823–838. doi:10.1007/s40194-015-0242-3 Ibrahim, R.A., 2016. Overview of Structural Life Assessment and Reliability, Part VI: Crack Arresters. J. Sh. Prod. Des. 32, 71–98. Inoue, T., Yamaguchi, Y., Yajima, H., Aihara, S., Yoshinari, H., Hirota, K., Kiyosue, T., Tani, T., 2010. Required Brittle Crack Arrest TOughness Kca Value with Actual-scale Model Tests -Brittle Crack Arrest Design for Large Container Ships -4-, in: Proceedings of the Tweintieth International Offshore and Polar Engineering Conference. pp. 95–101. Nishioka, T., Nishi, M., Fujimoto, T., Sakakura, K., 1985. A study on the Front Shapes and Surface Singularity of Dynamically Propagating Cracks. Trans. Japan Soc. Mech. Eng. A 33, 1660–1668. doi:10.1248/cpb.37.3229 Nishioka, T., Ooya, T., Goami, K., Fujimoto, T., Okamoto, G., 2010. Pure Research into Hall (Crack Arrester) for Brittleness High Speed Destruction Stop ̆-The First Report Basic Experiment That Uses CGS Method And Ultra High Speed Video Camera-. J. Japanese Soc. Exp. Mech. 10, 69–73. Prabel, B., Marie, S., Combescure, A., 2008. Using the X-FEM method to model the dynamic propagation and arrest of cleavage cracks in ferritic steel. Eng. Fract. Mech. 75, 2984–3009. doi:10.1016/j.engfracmech.2008.01.008 Sumi, Y., Yajima, H., Toyosada, M., Yoshikawa, T., Aihara, S., Gotoh, K., Ogawa, Y., Matsumoto, T., Hirota, K., Hirasawa, H., Toyoda, M., Morikage, Y., 2013. Fracture control of extremely thick welded steel plates applied to the deck structure of large container ships. J. Mar. Sci. Technol. 18, 497–514. doi:10.1007/s00773-013-0222-5 Yanagimoto, F., Shibanuma, K., Suzuki, K., Matsumoto, T., Aihara, S., 2018. Local stress in the vicinity of a propagating cleavage crack tip in ferritic steel. Mater. Des. 144, 361–373. Yue, Z., Song, Y., Yang, R., Yu, Q., 2017. Comparison of caustics and the strain gage method for measuring mode I stress intensity factor of PMMA material. Polym. Test. 59, 10–19. doi:10.1016/j.polymertesting.2017.01.012