### Consider the elevated temperature crack growth

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Consider the elevated temperature crack growth characteristics of ceramics in which glassy films at grain boundaries undergo viscous deformation at high temperature. Provide a physical reason for the argument in Section 11.7.3 that, for fixed values of the maximum stress intensity factor and cyclic frequency, an increase in fatigue crack growth rates occurs in the following sequence of waveforms: triangular -> sinusoidal -> trapezoidal or squar

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