### Abstract

In order to clarify the bulk breakage mechanism of metallurgical coke in blast furnace, the overlaying mesh finite element analysis that can consider both macro and micro-structure simultaneously is applied for complex micro-structural geometry such as coke. We introduced the stress intensity factor, a criterion of stress concentration around the crack tip, which can get from displacements of singular points by the template mesh putting on the crack tip and evaluated characteristics of fracture for high-strength coke. The numerical results show that the stress intensity factor (K_{I}*) is dependent on porosity (ε) linearly and then we proposed the following equation considering a shape parameter (C) and the stress intensity factor (B) at ε=0. K_{I}* = B(1-Cε) This equation shows that the stress intensity factor decreases with porosity because principal stress around pores in the neighbourhood of the crack tip becomes larger and pores prevent stress around the crack tip from concentrating. This negative effect of relaxation becomes larger as porosity increases. Here the parameter C is a specific value, it depends on pore shape and does not depend on crack length. We conclude that this numerical analysis is very useful for estimation of coke quality.

Original language | English |
---|---|

Pages (from-to) | 7-13 |

Number of pages | 7 |

Journal | Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan |

Volume | 87 |

Issue number | 11 |

Publication status | Published - Nov 1 2001 |

Externally published | Yes |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Metals and Alloys
- Materials Chemistry

### Cite this

*Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan*,

*87*(11), 7-13.

**Micro-structural analysis of coke using the overlaying mesh finite element method.** / Asakuma, Y.; Soejima, M.; Yamamoto, Tsuyoshi; Aoki, H.; Miura, T.; Itagaki, S.

Research output: Contribution to journal › Article

*Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan*, vol. 87, no. 11, pp. 7-13.

}

TY - JOUR

T1 - Micro-structural analysis of coke using the overlaying mesh finite element method

AU - Asakuma, Y.

AU - Soejima, M.

AU - Yamamoto, Tsuyoshi

AU - Aoki, H.

AU - Miura, T.

AU - Itagaki, S.

PY - 2001/11/1

Y1 - 2001/11/1

N2 - In order to clarify the bulk breakage mechanism of metallurgical coke in blast furnace, the overlaying mesh finite element analysis that can consider both macro and micro-structure simultaneously is applied for complex micro-structural geometry such as coke. We introduced the stress intensity factor, a criterion of stress concentration around the crack tip, which can get from displacements of singular points by the template mesh putting on the crack tip and evaluated characteristics of fracture for high-strength coke. The numerical results show that the stress intensity factor (KI*) is dependent on porosity (ε) linearly and then we proposed the following equation considering a shape parameter (C) and the stress intensity factor (B) at ε=0. KI* = B(1-Cε) This equation shows that the stress intensity factor decreases with porosity because principal stress around pores in the neighbourhood of the crack tip becomes larger and pores prevent stress around the crack tip from concentrating. This negative effect of relaxation becomes larger as porosity increases. Here the parameter C is a specific value, it depends on pore shape and does not depend on crack length. We conclude that this numerical analysis is very useful for estimation of coke quality.

AB - In order to clarify the bulk breakage mechanism of metallurgical coke in blast furnace, the overlaying mesh finite element analysis that can consider both macro and micro-structure simultaneously is applied for complex micro-structural geometry such as coke. We introduced the stress intensity factor, a criterion of stress concentration around the crack tip, which can get from displacements of singular points by the template mesh putting on the crack tip and evaluated characteristics of fracture for high-strength coke. The numerical results show that the stress intensity factor (KI*) is dependent on porosity (ε) linearly and then we proposed the following equation considering a shape parameter (C) and the stress intensity factor (B) at ε=0. KI* = B(1-Cε) This equation shows that the stress intensity factor decreases with porosity because principal stress around pores in the neighbourhood of the crack tip becomes larger and pores prevent stress around the crack tip from concentrating. This negative effect of relaxation becomes larger as porosity increases. Here the parameter C is a specific value, it depends on pore shape and does not depend on crack length. We conclude that this numerical analysis is very useful for estimation of coke quality.

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UR - http://www.scopus.com/inward/citedby.url?scp=0035516783&partnerID=8YFLogxK

M3 - Article

VL - 87

SP - 7

EP - 13

JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

SN - 0021-1575

IS - 11

ER -