Abstract
In many cases of mechanical and thermomechanical stress, refractories showing reduced brittleness corresponding with a pronounced nonlinear material behaviour are desired. A fracture mechanical characterization is based on a wedge splitting test which enables stable crack propagation for sufficiently large specimens. Figures-of-merit derived from the test results for the estimation of brittleness and resistance against thermal shock are the characteristic length l ch and the parameters R′′′′ and R st according to Hasselman. Moreover, the R-curve behaviour is calculated. In order to identify the microprocesses responsible for nonlinear material behaviour, a technique for the preparation of specimens was developed that allows the microscopical investigation before and after crack propagation. A decrease in the ceramic bond between grain and matrix as well as pre-existing cracks (microcracks), especially at the grain boundaries, reduce the energy consumed for the fracture of bonds and increase nonlinear effects such as friction in the process wake and grain bridging.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.