Dislocation modelling of stage I fatigue crack growth
A simulation of the dynamics of generation, motion and interaction of dislocations in the stress field ahead of a mode II crack under a cyclic loading is presented. The cyclic plastic displacement at the crack tip allows the growth rate to be determined. Crack growth rate curves show an inherent thr...
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| Format: | Conference item |
| Published: |
1999
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| Summary: | A simulation of the dynamics of generation, motion and interaction of dislocations in the stress field ahead of a mode II crack under a cyclic loading is presented. The cyclic plastic displacement at the crack tip allows the growth rate to be determined. Crack growth rate curves show an inherent threshold DeltaK(th) below which no crack growth takes place. The simulations show that DeltaK(th) and near threshold crack growth rates are sensitive to the load ratio in accord with experiment. The retardation of cracks growing toward a microstructural barrier is investigated with the simulation. |
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