Journal
THEORETICAL AND APPLIED FRACTURE MECHANICS
Volume 116, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tafmec.2021.103134
Keywords
Refractories; Magnesia-Hercynite; Thermal shock resistance; Fracture behaviour; Fracture process zone; Digital image correlation
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The fracture behavior of Magnesia-Hercynite material has been studied using a combination of advanced methods such as Digital Image Correlation and Wedge Splitting Test. This coupling proves to be effective in accurately measuring fracture parameters and highlighting characteristic fracture mechanisms like crack-branching. The results show interesting correlations between FPZ development and enhanced crack propagation resistance.
Magnesia-Hercynite bricks destined for thermal shock applications in cement rotary kilns often show an enhanced crack propagation resistance due to an engineered microstructure design. In these materials, micro crack networks, resulting from the thermal expansion mismatch between magnesia matrix and Hercynite aggregates, promote the activation of energy dissipating mechanisms within the so-called Fracture Process Zone (FPZ) during loading. In this research, the fracture behaviour of a Magnesia-Hercynite material has been investigated by coupling an enhanced Digital Image Correlation method (2P-DIC) with the Wedge Splitting Test (WST). The coupling of these advanced characterisation methods is very effective in measuring important fracture parameters accurately and in highlighting characteristic fracture mechanisms, such as crack-branching. A refined R-curve approach is proposed with effective fracture energy calculations based on 2P-DIC measurements. The results demonstrate interesting correlations between FPZ development and an enhanced crack propagation resistance.
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