Effect of random pore shape, arrangement and nonadhesion grain boundaries on coke strength

Yasuhiro Saito, Shohei Matsuo, Tetsuya Kanai, Ayuko Toishi, Ataru Uchida, Yoshiaki Yamazaki, Yohsuke Matsushita, Hideyuki Aoki, Seiji Nomura, Hideyuki Hayashizaki, Shigeto Miyashita

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


In this study, the rigid bodies-spring model (RBSM) was used to numerically investigate how the fracture behavior of coke is affected by pore structure and non-adhesion grain boundaries. To study the effects of pore structure, randomly shaped pores were generated and randomly positioned in a coke matrix. The random shapes of pores were controlled by pore roundness and their random sizes were controlled by equivalent circle diameters. Non-adhesion grain boundaries were also randomly located in the coke matrix. First, results for a coke model with realistic pore structures showed that large distorted pores decrease coke strength. Second, fracture behavior was analyzed for a coke model composed of a coke matrix, pores, and non-adhesion grain boundaries. Coke strength decreased as the number of non-adhesion grain boundaries increased; these numerical results agreed with previous experimental data. Further, coke strength decreased even in the presence of only a relatively small number of non-adhesion grain boundaries. This is because, when non-adhesion grain boundaries occur in stress-concentrated regions, those boundaries become origins for fracture. This indicates that the presence of non-adhesion grain boundaries is one factor that decreases the strength of coke when it has been blended with low-quality coal.

Original languageEnglish
Pages (from-to)2519-2526
Number of pages8
JournalIsij International
Issue number11
Publication statusPublished - 2014


  • Coke
  • Coke strength
  • Ironmaking
  • Low-quality coal
  • Non-adhesion grain boundary
  • RBSM

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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