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vol.54 número331Influência de aditivos na produção de blocos cerâmicos índice de autoresíndice de assuntospesquisa de artigos
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Cerâmica

versão impressa ISSN 0366-6913versão On-line ISSN 1678-4553

Resumo

PERET, C. M.  e  RODRIGUES, J. A.. Stability of crack propagation during bending tests on brittle materials. Cerâmica [online]. 2008, vol.54, n.331, pp.382-387. ISSN 0366-6913.  http://dx.doi.org/10.1590/S0366-69132008000300018.

Applications of ceramic materials usually involve thermal stresses that can reduce their lifetime considerably. One of the most relevant mechanical properties for evaluating thermal shock damage resistance is the energy of fracture. In order to obtain this property, a stable crack growth regimen must be achieved throughout the test. In this paper, three-point bending tests are analyzed to determine how machine stiffness influences load point displacement rates. Understanding the differences between recorded and adjusted displacement rates is important in determining the stability of crack growth. This statement is corroborated by experimental data on sintered high-alumina, low-cement refractory castables.

Palavras-chave : energy of fracture; stable crack growth; 3-point bending test; refractory castable; stiffness.

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