Abstract
Abstract Dynamic four-point-bending tests between 20 and 900 °C were carried out in laboratory air on an alumina ceramic with a few intergranular glass phases (MgO, SiO 2 , CaO). The inert strength decreases with increasing temperature from 25 to 900 °C. In this range the temperature has no influence on the values of the corrected Weibull modulus m k . This means, that the strength distribution of the alumina investigated did not depend on the test temperature. The subcritical crack growth parameter A increases with increasing temperature from 25 to 500 °C and then decreases with further increasing temperature up to 900 °C. In contrast to this behaviour, for the parameter n the opposite temperature dependence turns out; n decreases between 25 and 500 °C and then increases. From d a /d t - K I plots it can be seen that the subcritical crack growth behaviour changes at a temperature of about 500 °C. For a constant crack propagation rate K I decreases with increasing temperature from 25 to 500 °C and then increases with further increasing temperature.
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