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http://dx.doi.org/10.3795/KSME-A.2016.40.7.653

A Study on the Effects on Low Cycle Fatigue Life of a High Pressure Turbine Nozzle due to the Perturbation of Crystal Orientation of Grain of DS Materials  

Huh, Jae Sung (Aero-propulsion Research Office, Korea Aerospace Research Institute)
Kang, Young Seok (Aero-propulsion Research Office, Korea Aerospace Research Institute)
Rhee, Dong Ho (Aero-propulsion Research Office, Korea Aerospace Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.40, no.7, 2016 , pp. 653-658 More about this Journal
Abstract
High pressure components of a gas turbine engine are generally made of nickel-base superalloys, using precision casting process due to complicated geometries with intricate channels and cooling holes. Turbine components manufactured from directionally solidified and single crystal materials have columnar grains; however, it is found that the crystals do not grow in its preferred direction, although the orientation can be controlled. This anisotropy can lead to the variations of elastic and Hill's parameters in constitutive equations, and they alter stress distributions and the low cycle fatigue life. We aims to evaluate the effects of perturbed crystal orientations on the structural integrity of a directionally solidified nozzle using low cycle fatigue life. We also attempt to show the necessity for the control of allowed manufacturing errors and stochastic analysis. Our approaches included conjugate heat transfer and structural analysis, along with low cycle fatigue life assessment.
Keywords
High Pressure Turbine Nozzle; Directionally Solidified Material; Crystal Orientation of Grain; Uncertainty; Low Cycle Fatigue Life; Critical Plane Approach;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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