NUMERICAL MODELING OF MACRO-SCALE BRITTLE ROCK CRUSHING DURING IMPACTS
Badr, S., Abdelhaffez, G. (2012). NUMERICAL MODELING OF MACRO-SCALE BRITTLE ROCK CRUSHING DURING IMPACTS. EKB Journal Management System, 40(No 6), 1781-1792. doi: 10.21608/jesaun.2012.114619
Salah, A. Badr; Gamal, S. Abdelhaffez. "NUMERICAL MODELING OF MACRO-SCALE BRITTLE ROCK CRUSHING DURING IMPACTS". EKB Journal Management System, 40, No 6, 2012, 1781-1792. doi: 10.21608/jesaun.2012.114619
Badr, S., Abdelhaffez, G. (2012). 'NUMERICAL MODELING OF MACRO-SCALE BRITTLE ROCK CRUSHING DURING IMPACTS', EKB Journal Management System, 40(No 6), pp. 1781-1792. doi: 10.21608/jesaun.2012.114619
Badr, S., Abdelhaffez, G. NUMERICAL MODELING OF MACRO-SCALE BRITTLE ROCK CRUSHING DURING IMPACTS. EKB Journal Management System, 2012; 40(No 6): 1781-1792. doi: 10.21608/jesaun.2012.114619

NUMERICAL MODELING OF MACRO-SCALE BRITTLE ROCK CRUSHING DURING IMPACTS

JES. Journal of Engineering Sciences
Article 13, Volume 40, No 6, November and December 2012, Page 1781-1792  XML PDF (744.09 K)
Document Type: Research Paper
DOI: 10.21608/jesaun.2012.114619
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Authors
Salah, A. Badr1; Gamal, S. Abdelhaffez2
1Mining Eng. Dept., Faculty of Engineering., king Abdulaziz University, Jeddah, Saudi Arabia
2Secondment from Mining Engineering Department, Faculty of Engineering, Assiut University, Egypt.
Abstract
Several machines, such as percussion drills and crushers use the physical effect of compression to crush hard and brittle rocks. These machines are still sized rather by empirical than by scientific approaches. In order to investigate the principles of comminution by compression of single large rock fragment, a numerical model developed by Particle Flow Code “PFC®” program was developed to simulate the dynamics of this system. The model simulates a single rock fragment crushed by a number of fixed kinetic energy ram blows. The simulated fragment is circler granite disk of unit thickness with grain matrix at the range from 2 to 4 mm. The model results indicates that cracks generated due compression are more popular compared to those due shear and this conduct increases with increase of number of hits. The impact energy is consumed mainly in form of friction energy ≈ 52 to 61% inside the fragmented matrix while strain energy stays at the range of ≈ 5%. The rock matrix tends to consume more of these energies as number of impacts increases due change to crushed matrix milling and cushioning. The energy consumed in crushing the rock fragment represents at the range from 32 to 45% of impact energy and tends to decrease as number of hits increase.
Keywords
crushing energy; rock fragmentation; Discrete Element Method (DEM); PFC2D code; crushing energies
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