Fatigue Crack Propagation Resistance

Example Tsai et al. investigated fatigue behavior in zirconia—alumina composites after heat treatments designed to modify the zirconia transformation yield stresses. Raman spectroscopy was used to quantify the fractions of monoclinic 

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Fig. 4. Plot of crack propagation, da/dN, as a function of stress intensity range or crack driving force, AK. The plot shows the effect of sterilization method and the effects of accelerated aging on the fatigue crack propagation resistance of UHMWPE [86]...

Products with the best toughness exhibit gcx)d fatigue crack propagation resistance at 20 °C (68 °F). lypical da/dN characteristic are shown here. 

Beta foiging techniques are, however, used to develop microstructures in a, a + P, and near P-alloys characterized by Widmanstatten or acicular primary a morphology in a transformed P matrix. This foiging process is typically used to enhance fi actiue-related properties, such as firacture tou mess and fatigue crack propagation resistance, and to enhance the creep resistance of a and a-P alloys. In fact, some a alloys (such as Ti-1100) are designed to be P foiged to develop the desired final mechanical properties. 

Oral E, Malhi A, Muratoglu O. Mechanisms of decrease in fatigue crack propagation resistance in irradiated and melted UHMWPE. 

Baker D, Coughlin D, Pruitt L. The effect of accelerated aging and sterilization method on the fatigue crack propagation resistance of Hylamer-M and GUR4150HP at body temperature. Trans 34th Soc Biomater 1998 21 122. 

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