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Three-dimensional dislocation dynamics simulations are used to studymicro-crack interaction with the first micro-structural barrier in face-centredcubic bi-crystals loaded in high cycle fatigue conditions. In the examinedconfiguration, we assumed that micro-crack transmission occurs due to surfacerelief growth in the secondary grain ahead of the primary crack. This indirecttransmission mechanism is shown to strongly depend on grain-1/grain-2disorientation. For instance, small grain disorientation induces plastic strainlocalisation ahead of the crack and faster transmission through the firstbarrier. Conversely, large grain-1/grain-2 disorientation induces plasticstrain spreading similar to crack tip blunting yielding slower indirecttransmission. A semi-analytical micro-model is developed based on the presentsimulation results and complementary experimental observations highlighting theoriginal notion of first-barrier compliance. The model captures well knownexperimental trends including effects of: grain-size, grain disorientation andmicro-crack retardation at the first barrier.

acta materialia

Effect of grain disorientation on early fatigue crack propagation in  face-centred-cubic polycristals: A three-dimensional dislocation dynamics  investigation