Breakage Characterization of Magnetite under Impact Loads and Cyclic Impact Loading

Liang Si, Yijun Cao and Guixia Fan
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Liang Si: School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
Yijun Cao: School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China
Guixia Fan: School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China

Energies, 2020, vol. 13, issue 20, 1-14

Abstract: A series of impact compression tests were conducted to study the breakage characteristics of magnetite, as well as the impact pressure on its strain rate and dynamic compressive strength. The dynamic mechanical properties and fragmentation size distribution of magnetite under diverse impact loads and cyclic impact were investigated, with fractal theory as a basis and split Hopkinson pressure bar (SHPB). Breakage methods were also employed to analyze the fracture morphology of magnetite. According to the result, the fractal dimension can reflect the distribution of fragments in various sizes. If the strain rate increases, the fractal dimension will be larger, the fragment size will be finer, and the fragmentation degree will be more influential. A micro-analysis of SEM images demonstrates that the fracture morphology is determined by mineral properties. Under low load cyclic impact, intergranular fracture is the main fractography. Besides, the intergranular fracture will be changed to a transgranular one as the impact load increases.

Keywords: SHPB setup; breakage characteristic; strain rate; fractal dimension; fractography (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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