Abstract
In the present paper, a new microscopic mechanism model of fatigue crack growth is presented based on the dislocation-free zone (DFZ) theory. A cohesive zone model is developed to determine the stress field of the DFZ under cyclic loading. The process of fatigue crack growth is viewed as the intermittent quasi-cleavage fracture of the DFZ. A simple relation is derived to evaluate the fatigue crack growth rate. The calculated dc/dN curves exhibit three different regimes of fatigue crack growth, which is in agreement with the general propagation pattern of fatigue crack. The model gives a reasonable explanation for both the crack growth and striation formation.
| Original language | English |
|---|---|
| Pages (from-to) | 14-17 |
| Number of pages | 4 |
| Journal | Materials Science and Engineering: A |
| Volume | 355 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - 25 Aug 2003 |
Keywords
- Cleavage fracture
- Cohesive zone
- Dislocation-free zone
- Fatigue crack growth
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