Evaluation of coke strength considering pore shapes by using a homogenization method

In this study, the effect of pore on coke strength is investigated using a homogenization method. The stress analysis using a homogenization method is carried out for two cases of pore shapes. Case 1 is the round pores with the same diameter, which is regularly arranged in the unit cell. Case 2 is the irregular shape pores arranged randomly in the unit cell. In Case 1, the stress in the coke rises with an increase in the porosity. The stress distribution is determined by the porosity and is independent of the pore diameters and the number of pores. In Case 2, the stress in the coke with the irregular pore shapes increases with porosity and is larger than that with regular pore shapes. This is because that the stress concentration occurs at the sharp edges of pores. In addition, the stress analysis is carried out for the unit cell composed of circular pores which has different diameters and randomly arranged pores. As a result, the existence of circular pore reduces the stress in the coke and hardly lowers the rigidity of the coke while the arrangement of pores has little effect on lowering the rigidity.