About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Direct Observations and Characterization of Crack Closure during Microstructurally Small Fatigue Crack Growth via In Situ High-energy X-ray Characterization |
Author(s) |
Michael D. Sangid, Priya Ravi, Diwakar Naragani, Peter Kenesei, Jun-Sang Park |
On-Site Speaker (Planned) |
Michael D. Sangid |
Abstract Scope |
Direct observation of the crack closure mechanism of a naturally occurring, tortuous, 3D microstructurally small fatigue crack (SFC) are presented based on in situ high-energy X-ray diffraction experiments. These techniques provide the 3D microstructure and micromechanical response in the vicinity of the crack front. Specifically, the evolution of the stress state was analyzed for grains at the crack tip during cyclic loading and compared to observations of crack opening/closing events enabled by tomography. From this analysis, three grains that displayed different degrees of crack closure were further investigated, based on the orientation of the crack relative to the grains and the associated modality of crack growth. The stress normal to the crack plane and the associated degree of Mode I crack behavior were correlated with events of the crack opening earlier during the loading cycle. The mechanisms governing crack closure are discussed based on the associated grain-scale stress state. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Additive Manufacturing |