| Autor: |
Harris Tucker, Reeju Pokharel, Peter Kenesei, Anthony D. Rollett, Robert M. Suter, C. M. Hefferan, A. R. Cerrone, Clayton Stein, Jonathan Lind, Anthony R. Ingraffea, Tugce Ozturk, Sukbin Lee |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Current Opinion in Solid State and Materials Science. 18:244-252 |
| ISSN: |
1359-0286 |
| DOI: |
10.1016/j.cossms.2014.06.001 |
| Popis: |
The study of fatigue in metals, and fatigue initiation specifically, lends itself to analysis via an emerging set of characterization and modeling tools that describe polycrystals on the meso- or microstructural length scale. These include three-dimensional characterization techniques, elastic anisotropic and visco-plastic stress models, new approaches to the statistical description of stress and strain distributions, synthetic microstructure modeling, and improved tools for manipulating the large datasets generated. A specific example of analysis in both 2D and 3D of fatigue cracks in a nickel-based superalloy is given where all the cracks are effectively coincident with coherent twin boundaries. A spectral method is used to analyze the stress state based on a fully anisotropic elastic calculation. The results indicate that, although a high resolved shear stress is associated with the locations of the observed cracks, the length of the trace of the twin boundary is more strongly correlated with crack formation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect