Technical Briefs

Life Assessment of Turbine Components Through Experimental and Numerical Investigations

[+] Author and Article Information
Guicang Hou

School of Energy and Power Engineering,
BeiHang University,
Beijing 100191, China

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received April 16, 2012; final manuscript received October 21, 2012; published online March 18, 2013. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 135(2), 024502 (Mar 18, 2013) (6 pages) Paper No: PVT-12-1043; doi: 10.1115/1.4007962 History: Received April 16, 2012; Revised October 21, 2012

A new lifetime criterion for withdrawal of turbine components from service is developed in this paper based on finite element (FE) analysis and experimental results. Finite element analysis is used to determine stresses in the turbine component during the imposed cyclic loads and analytically predict a fatigue life. Based on the finite element analysis, the critical section is then subjected to a creep-fatigue test, using three groups of full scale turbine components, attached to an actual turbine disc conducted at 750 °C. The experimental data and life prediction results were in good agreement. The creep-fatigue life of this type of turbine component at a 99.87% survival rate is 30 h.

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Fig. 1

Strategy for creep-fatigue life assessment of turbine component

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Fig. 2

FE model of the attachment

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Fig. 3

The rotational speed spectrum

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Fig. 4

Equivalent stress of the turbine attachment

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Fig. 5

Equivalent stress for the tenon

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Fig. 6

Equivalent stress for the mortise

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Fig. 7

Larson-Miller curve of GH742 superalloy

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Fig. 8

A sketch of creep-fatigue loading method for full scale turbine components

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Fig. 10

Lead wires of temperature monitoring

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Fig. 11

Load spectrum of creep-fatigue test

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Fig. 12

Experimental turbine component

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Fig. 9

Fatigue test in progress

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Fig. 13

Failed turbine blade and turbine discs

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Fig. 14

Fracture surface of turbine disc




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