Probalistic Stress Rupture Life Analysis of Turbine Blades
The on-going effort to improve the efficiency of gas-powered turbines has facilitated incremental increases in the temperature and stress imposed on turbine components, such as blades, vanes, etc. The incipient failure of blades subjected to mechanical loads of 60 MPa to 950 MPa and temperatures up to 600°C or higher lead to failure manifesting in irreparable damage to the entire engine system. One of the primary failure modes of turbine blades is creep, which is facilitated by the high temperature at the turbine inlet coupled with the centrifugal stresses. This thesis will employ a probabilistic design approach to better assess the probability of failure due to creep rupture rather than accepting an unknown level of risk associated with the creep stress rupture criteria used for the deterministic analysis. NESSUS will be used to perform probabilistic analysis in order to predict the life and probability of failure of internally-cooled turbine blades due to creep rupture. Probabilistic analysis of the simulation results from this thesis will provide a probability distribution of the creep rupture lives and their sensitivity to the input variables for manufacturing, operational, thermal load and material property variations. It will predict the distribution of blade creep lives for a population of engines as well as determine the most sensitive input variables. This study will also be significant in determining and evaluating the effects of parameters that control component life and finally assist in improving performance, reducing cost, extending life of the component, and making the design robust.
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Gordon, Ali P.
Bachelor of Science (B.S.)
College of Engineering and Computer Science
Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic; Gas turbines -- Blades
Length of Campus-only Access
Honors in the Major Thesis
Khan, Sameer, "Probalistic Stress Rupture Life Analysis of Turbine Blades" (2006). HIM 1990-2015. 591.