INVESTIGATION OF DESTRUCTION PROCESS OF THE DOUBLE PHASED IRON ORE PELLETS UNDER EXTERNAL LOADS

Тhe fracture behavior of iron ore pellets with double-phase structure which consists of magnetite core and hematite shell had been investigated in this work. The finite element model of two point load tests implemented in the software package SIMULIA Abaqus, are developed for study the load deformation behavior and the fracture of double–phased iron ore pellets. The results of this study showed that the maximum stresses were loaded in the compressed places of the shell. There were carried out two experimental methods to determine the process of cracking inside the pellet under compressive loads. The first method consisted of testing the half of double phased pellet between two horizontal plates that were under the compres- sive load. This tests were provided with making video. The sample was loaded until its failure. In the other case tested the whole pellets which were loaded by the discrete load. After that pellets were cut in halves and then its was investigated with using method of optical microscopy. The results showed that the fracture will be initiated at the shell earlier than at the core of the double–phased pellets, despite the possibility of initiation the first cracks in the magnetite core.

double-phased iron ore pellets, mechanical characterization, two point load test, fracture criterion, finite element model, magnetite core, hema- tite shell, compressive load, stress and deformation behavior, cracking, software package SIMULIA Abaqus

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