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Abstract—The deformation and fracture of gas turbine parts like turbine blades which are subjected to high
temperature and other mechanical loads, depends mainly on temperature and time and hence
due to creep. For reliable operation of a gas turbine, life prediction of the components of the
turbine is of prime importance so that the damages can be detected and repaired before it gets
problematic. In the present study, a low-pressure turbine disc is analyzed for the stress field
under mechanical and thermal loading. The mechanical thermal loads and boundary conditions
are imposed in the finite element analysis software ANSYS. A time hardening model is used to
predict the stress relaxation and creep strain accumulations in the component with respect to
time. The Larson-Miller Parameter (LMP) data is used to evaluate the constants used in this
creep analysis. By defining the model through these constants, stress relaxation feature was
captured and the total time in hours for an accumulated creep strain of 0.1% was calculated.
The time required for the accumulation of the creep strain, without considering the stress relaxation
phenomena was observed to be conservative by an order. Thus the considerations given to
creep play a vital role in the design of machine components especially the aero gas turbine
engine components, which are primarily subjected to severe mechanical and thermal loads.
Index Terms—Gas turbine, Creep life, Larson miller parameter, Stress relaxation
Cite: Abhishek S Makunte and Ramesh B N, "Analysis of Turbine Disc for Creep Life," International Journal of Mechanical Engineering and Robotics Research, Vol. 3, No. 3, pp. 792-801, July 2014.