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Numerical simulation of the fracture process in concrete resulting from deflagration phenomena.

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Title: Numerical simulation of the fracture process in concrete resulting from deflagration phenomena.
Authors: Fukuda, Daisuke1 d-fukuda@frontier.hokudai.ac.jp, Moriya, Kazuma2, Kaneko, Katsuhiko1, Sasaki, Katsuya3, Sakamoto, Ryo3, Hidani, Keitaro3
Source: International Journal of Fracture. Apr2013, Vol. 180 Issue 2, p163-175. 13p.
Subjects: Computer simulation, Fracture mechanics, Concrete, Electric discharges, Nitromethane, Strains & stresses (Mechanics), Finite element method
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. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Fracture is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Numerical simulation of the fracture process in concrete resulting from deflagration phenomena.
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  Data: <searchLink fieldCode="AR" term="%22Fukuda%2C+Daisuke%22">Fukuda, Daisuke</searchLink><relatesTo>1</relatesTo><i> d-fukuda@frontier.hokudai.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Moriya%2C+Kazuma%22">Moriya, Kazuma</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kaneko%2C+Katsuhiko%22">Kaneko, Katsuhiko</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sasaki%2C+Katsuya%22">Sasaki, Katsuya</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Sakamoto%2C+Ryo%22">Sakamoto, Ryo</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Hidani%2C+Keitaro%22">Hidani, Keitaro</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Fracture%22">International Journal of Fracture</searchLink>. Apr2013, Vol. 180 Issue 2, p163-175. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br /><searchLink fieldCode="DE" term="%22Fracture+mechanics%22">Fracture mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Concrete%22">Concrete</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+discharges%22">Electric discharges</searchLink><br /><searchLink fieldCode="DE" term="%22Nitromethane%22">Nitromethane</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink>
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  Data: 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. [ABSTRACT FROM AUTHOR]
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  Label:
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  Data: <i>Copyright of International Journal of Fracture is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10704-013-9809-4
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        Text: English
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      – SubjectFull: Computer simulation
        Type: general
      – SubjectFull: Fracture mechanics
        Type: general
      – SubjectFull: Concrete
        Type: general
      – SubjectFull: Electric discharges
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      – SubjectFull: Nitromethane
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      – SubjectFull: Strains & stresses (Mechanics)
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      – SubjectFull: Finite element method
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      – TitleFull: Numerical simulation of the fracture process in concrete resulting from deflagration phenomena.
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              Text: Apr2013
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