|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical and Creep Behavior of Advanced Materials: A SMD Symposium Honoring Prof. K. Linga Murty
||L-114: Effects of Blade Curvature on Fatigue Life of Nickel-based Single Crystal Structures with Film-cooling Holes
||Zhixun Wen, Yamin Zhang, Youliang Li, Zhufeng Yue
|On-Site Speaker (Planned)
The curved thin-walled structures of multi film cooling holes with different curvatures were adopted to simulate film cooling turbine blades. The low cycle fatigue (LCF) characteristic was studied based on the theory of crystallographic slip damage. The resolved shear stress of slip systems, distribution of fatigue damage and LCF life were analyzed. Results show that there are obvious stress interferences among cooling holes, and the stress distribution is diamond-shape. Two slip bands around the holes were found to be lied on the line at approximately 45° to 135° with respect to the loading axis. The maximum resolved shear stress reduces with the increase of curvature radius. Meanwhile, the LCF life increases positively related with the curvature radius. When curvature radius is less than 13mm, the curvature radius has a remarkable effect on the resolved shear stress and LCF life, however, when the curvature radius exceed 13mm, the curved structure can be replaced with the plate structure. Furthermore, an exponential curve is found to be fit for the relation between the curvature radius and the logarithmic fatigue life.
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