This paper has studied the stress distribution and deformation of the fourth stage turbine blades and disk of a certain kind of heavy gas turbine with FEM method. The calculating model is assembled turbine blades and disk, and the analysis includes 2-D and 3-D situations. By calculating under centrifugal force and thermal loads, the conclusion of whether the turbine blades and disk were safe and the strength characteristics were drawn. The results shown that stress concentration of the structure is a problem that can’t be ignored. To enhance the security of structure, optimizing of the structure is recommended. Also, the results shown that structure deformation is caused mostly by thermal load and structure stress is caused mostly by centrifugal force. ( CSPE)

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