Details
| Original language | English |
|---|---|
| Pages (from-to) | 801-821 |
| Number of pages | 21 |
| Journal | International Journal of Plasticity |
| Volume | 27 |
| Issue number | 5 |
| Publication status | Published - 25 Sept 2011 |
| Externally published | Yes |
Abstract
In this paper, we construct a model for prediction of fatigue crack initiation based on the material's microstructure. In order to do so, the energy of a persistent slip band (PSB) is monitored and an energy balance approach is taken, in which cracks initiate and the material fails due to stress concentration from a PSB (with respect to dislocation motion). These PSBs are able to traverse low-angle grain boundaries (GB), thus belonging to clusters of grains. As a consequence of the ongoing cyclic slip process, the PSBs evolve and interact with high-angle GBs, the result of which leads to dislocation pile-ups, static extrusions in the form of ledges/steps at the GB, stress concentration, and ultimately crack initiation. Hence, this fatigue model is driven by the microstructure, i.e. grain orientations, widely distributed grain sizes, precipitates, PSB-GB interactions, as well as the affect of neighboring grains. The results predict that cracks initiate near twin boundaries from PSBs spanning a single large grain with a favorable orientation or multiple grains connected by low-angle GBs. Excellent agreement is shown between model predictions and experimental data.
Keywords
- Energy methods, Fatigue, Grain boundaries, Persistent slip bands, Polycrystalline material
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: International Journal of Plasticity, Vol. 27, No. 5, 25.09.2011, p. 801-821.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The role of grain boundaries on fatigue crack initiation - An energy approach
AU - Sangid, Michael D.
AU - Maier, Hans J.
AU - Sehitoglu, Huseyin
N1 - Funding information: Support for this work was provided by the Rolls-Royce Corporation and the National Science Foundation , DMR 08-03270 .
PY - 2011/9/25
Y1 - 2011/9/25
N2 - In this paper, we construct a model for prediction of fatigue crack initiation based on the material's microstructure. In order to do so, the energy of a persistent slip band (PSB) is monitored and an energy balance approach is taken, in which cracks initiate and the material fails due to stress concentration from a PSB (with respect to dislocation motion). These PSBs are able to traverse low-angle grain boundaries (GB), thus belonging to clusters of grains. As a consequence of the ongoing cyclic slip process, the PSBs evolve and interact with high-angle GBs, the result of which leads to dislocation pile-ups, static extrusions in the form of ledges/steps at the GB, stress concentration, and ultimately crack initiation. Hence, this fatigue model is driven by the microstructure, i.e. grain orientations, widely distributed grain sizes, precipitates, PSB-GB interactions, as well as the affect of neighboring grains. The results predict that cracks initiate near twin boundaries from PSBs spanning a single large grain with a favorable orientation or multiple grains connected by low-angle GBs. Excellent agreement is shown between model predictions and experimental data.
AB - In this paper, we construct a model for prediction of fatigue crack initiation based on the material's microstructure. In order to do so, the energy of a persistent slip band (PSB) is monitored and an energy balance approach is taken, in which cracks initiate and the material fails due to stress concentration from a PSB (with respect to dislocation motion). These PSBs are able to traverse low-angle grain boundaries (GB), thus belonging to clusters of grains. As a consequence of the ongoing cyclic slip process, the PSBs evolve and interact with high-angle GBs, the result of which leads to dislocation pile-ups, static extrusions in the form of ledges/steps at the GB, stress concentration, and ultimately crack initiation. Hence, this fatigue model is driven by the microstructure, i.e. grain orientations, widely distributed grain sizes, precipitates, PSB-GB interactions, as well as the affect of neighboring grains. The results predict that cracks initiate near twin boundaries from PSBs spanning a single large grain with a favorable orientation or multiple grains connected by low-angle GBs. Excellent agreement is shown between model predictions and experimental data.
KW - Energy methods
KW - Fatigue
KW - Grain boundaries
KW - Persistent slip bands
KW - Polycrystalline material
UR - http://www.scopus.com/inward/record.url?scp=79953881854&partnerID=8YFLogxK
U2 - 10.1016/j.ijplas.2010.09.009
DO - 10.1016/j.ijplas.2010.09.009
M3 - Article
AN - SCOPUS:79953881854
VL - 27
SP - 801
EP - 821
JO - International Journal of Plasticity
JF - International Journal of Plasticity
SN - 0749-6419
IS - 5
ER -