Journal
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
Volume 18, Issue 4, Pages 244-252Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cossms.2014.06.001
Keywords
LSHR; Fatigue; Slip accumulation; Coherent Sigma 3; Crack initiation; Superalloy
Funding
- AFOSR Discovery Challenge Thrust Grant [FA9550-10-1-0213]
- National Science Foundation [DMR080072]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1435544, 1606567] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1434462] Funding Source: National Science Foundation
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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. (C) 2014 Elsevier Ltd. All rights reserved.
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