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The approach provides a useful alternative to performing difficult short-crack fatigue experiments, particularly for materials with small bridging zones.
Model predictions qualitatively compare well to experimentally observed effects of fatigue crack growth transients in materials with crack bridging zones.
Both an alumina ceramic with large steady-state bridging zones (∼2 mm), where the predicted and experimentally measured fatigue threshold R-curves agree well over a range of crack sizes from 0.06 to 7 mm, and a Y2O3-MgO -dopedd Si3N4 ceramic, where bridging zones are much shorter (∼100 μm), are investigated.
Similar(57)
For monolithic, grain-bridging ceramics, the crack-size dependence of the fatigue threshold during bridging zone development presents a difficulty in its application in design.
The existence of a "free bridging zone" (different from the conventional "full bridging zone") is recognized, and its influence on the evolving fracture resistance is discussed.
The bridging zone resists the crack growth through aggregate bridging mechanism.
This is achieved by considering a bridging zone and a microcrack at the macrocrack tip.
A large-scale fracture process zone, consisting of a crack tip and a fibre bridging zone, developed.
The suggested model successfully represents the increase of the stress-constant bridging zone and the decrease of the stress-resisting zone with increasing fiber content.
The bridging tractions are expressed as a function of the maximum bridging stress, the bridging zone length and exponential softening parameter.
Regarding toughness, they exhibit a crack growth resistance (R-curve) behavior, derived from the development of a multiligament bridging zone at the crack wake.
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