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

Y. Asakuma, M. Soejima, Tsuyoshi Yamamoto, H. Aoki, T. Miura, S. Itagaki

Research output: Contribution to journalArticle

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 (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.

Original languageEnglish
Pages (from-to)7-13
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume87
Issue number11
Publication statusPublished - Nov 1 2001
Externally publishedYes

Fingerprint

coke
structural analysis
Structural analysis
Coke
Stress intensity factors
Crack tips
mesh
finite element method
stress intensity factors
crack tips
porosity
Finite element method
Porosity
Coal breakage
Metallurgical coke
Blast furnaces
Macros
Stress concentration
Numerical analysis
stress concentration

All Science Journal Classification (ASJC) codes

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

Cite this

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

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 87, No. 11, 01.11.2001, p. 7-13.

Research output: Contribution to journalArticle

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AU - Soejima, M.

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AU - Miura, T.

AU - Itagaki, S.

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