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Numerical simulation of the fracture process in concrete resulting from deflagration phenomena
| Title: | Numerical simulation of the fracture process in concrete resulting from deflagration phenomena |
| Authors: | Fukuda, Daisuke Browse this author →KAKEN DB | | Moriya, Kazuma Browse this author | | Kaneko, Katsuhiko Browse this author | | Sasaki, Katsuya Browse this author | | Sakamoto, Ryo Browse this author | | Hidani, Keitaro Browse this author |
| Keywords: | Dynamic fracture process analysis | | Deflagration | | Nitromethane | | Finite element method | | Concrete | | Material heterogeneity |
| Issue Date: | Apr-2013 |
| Publisher: | Springer |
| Journal Title: | International Journal of Fracture |
| Volume: | 180 |
| Issue: | 2 |
| Start Page: | 163 |
| End Page: | 175 |
| Publisher DOI: | 10.1007/s10704-013-9809-4 |
| Abstract: | This paper investigated the mechanism of fracture in concrete due to the deflagration phenomenon. For this purpose, the electric discharge impulse crushing method was selected, with liquid nitromethane (NM) taken as the deflagration agent. Employing this technique, NM is set inside charge holes and initiated by electric discharge. The pressure generated by the deflagration of NM in a steel chamber was modeled using the Jones-Wilkins-Lee equation of state. The modeled and measured pressures agreed well and the applicability of the pressure model was validated. Then, assuming controlled splitting along the expected fracture surface in concrete, dynamic fracture process analysis (DFPA) based on two-dimensional dynamic finite element method was conducted. The results showed that fracture patterns predicted in the DFPAs agreed well with those obtained from experiments. The mechanism of fracture in concrete due to deflagration was then discussed in terms of the fracture process in the controlled splitting. Owing to stress interference from each charge hole, compressive stress zones (CSZs) formed above and below the middle regions between charge holes where maximum and minimum principle stresses were both in compression. The CSZs was found to be important in obtaining a flatter fracture surface in the case of controlled splitting. In conclusion, the proposed method was shown to be useful for the investigation of the fracture mechanism in the case of the use of deflagration agents and could be useful for the design optimization of such controlled splitting. |
| Rights: | The final publication is available at link.springer.com |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/55291 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 福田 大祐
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