Fracture energy, R-curve behaviour and resistance to crack propagation in refractory ceramics

Reference Presenter Authors
(Institution)
Abstract
14-037 José de Anchieta Rodrigues Rodrigues, J.d.(Universidade Federal de São Carlos); Maginador, R.V.(Universidade Federal de São Carlos); Canto, R.B.(Universidade Federal de São Carlos);
Fracture energy, R-curve behaviour and resistance to crack propagation in refractory ceramics
José de Anchieta Rodrigues, Rafael Vargas Maginador, Rodrigo Bresciani Canto
Federal University of São Carlos, Department of Materials Engineering, Group of Materials Microstructure Engineering, São Carlos-SP, Brazil.
Abstract
One of the most important issues concerning high temperature ceramics is related to how much they resist operations under severe conditions, mainly at elevated temperatures. Resistance to crack propagation under thermal shock situations has demanded attention of many materials scientists and engineers around the world for decades. New applications, better formulations, novel theories and more precise experimentations have appeared, increasing the consistency of the research area with time. This talk presents a review of the main aspects involving fracture energy, R-curve behaviour and resistance to crack propagation related to refractory materials, with the purpose of harmonising many different concepts, looking for a general view of this important problem. Recently, interesting experimental technics have been developed, including optical methodologies, such as Digital Image Correlation (DIC) combined with Finite Elements Method (FEM), which allows the localization of the crack tip in a quasi-stable crack propagation experiment and, as a result, it calculates the R-curve of the refractory. Moreover, it is also possible to extract parameters solely from the load-displacement curve from a propagation experiment that will represent the trend of the propagation resistance of the crack. At the end, the talk highlights some examples of refractories characterization already published in the main journals and of others still under development.
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