Research Papers: Gas Turbines: Structures and Dynamics

Analysis of Multi-Axial Creep–Fatigue Damage on an Outer Cylinder of a 1000 MW Supercritical Steam Turbine

[+] Author and Article Information
Weizhe Wang

Key Laboratory of Education Ministry for
Power Machinery and Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China;
Gas Turbine Institute,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: wangwz0214@sjtu.edu.cn

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 28, 2014; final manuscript received May 7, 2014; published online May 28, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(11), 112504 (May 28, 2014) (8 pages) Paper No: GTP-14-1171; doi: 10.1115/1.4027634 History: Received March 28, 2014; Revised May 07, 2014

A multi-axial continuum damage mechanics (CDM) model was proposed to calculate the multi-axial creep–fatigue damage of a high temperature component. A specific outer cylinder of a 1000 MW supercritical steam turbine was used in this study, and the interaction of the creep and fatigue behavior of the outer cylinder was numerically investigated under a startup–running–shutdown process. To this end, the multi-axial stress–strain behavior of the outer cylinder was numerically studied using Abaqus. The in-site measured temperatures were provided to validate the heat transfer coefficients, which were used to calculate the temperature field of the outer cylinder. The multi-axial mechanics behavior of the outer cylinder was investigated in detail, with regard to the temperature, Mises stress, hydrostatic stress, multi-axial toughness factor, multi-axial creep strain, and damage. The results demonstrated that multi-axial mechanics behavior reduced the total damage.

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Fig. 1

(a) Structure and (b) mesh of outer cylinder

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Fig. 2

(a) Normalized startup curve, (b) normalized shutdown curve, and (c) range of each zone

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Fig. 3

Temperature distributions during startup process (I) and shutdown process (II)

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Fig. 4

Temperature differences during startup process (a) and shutdown process (b)

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Fig. 5

Schematic map of temperature measurement points on the outer cylinder

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Fig. 6

Demonstration of the fluctuating temperature under a steady-state power load condition

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Fig. 7

Mises stress distributions during startup process (I) and shutdown process (II)

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Fig. 8

Selected eight locations for the structural analysis

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Fig. 9

Temperature evolution at eight locations during startup (a) and shutdown (b) processes

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Fig. 10

Mises stress evolution at eight locations during startup process (a), steady-station operation process (b), and shutdown process (c)

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Fig. 11

Hydrostatic stress evolution at eight locations during steady-state operating condition

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Fig. 12

Multi-axiality evolution at eight locations during steady-state operating condition

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Fig. 13

Evolution comparison between the multi-axial strain ɛmul and multi-axiality αmul at eight locations

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Fig. 14

Total damage at eight locations throughout the whole operation




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