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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

A Continuum Damage Mechanics Model on Creep Rupture Life Assessment of a Steam Turbine Rotor

[+] Author and Article Information
Jing JianPing

The State Key Laboratory of Vibration, Shock & Noise,  ShangHai JiaoTong University, ShangHai 200030, P. R. Chinajianpj@sjtu.edu.cn

Meng Guang

The State Key Laboratory of Vibration, Shock & Noise,  ShangHai JiaoTong University, ShangHai 200030, P. R. China

Sun Yi, Xia SongBo

School of Energy Science and Engineering,  Harbin Institute of Technology, Harbin 150001, P. R. China

J. Eng. Gas Turbines Power 128(1), 173-177 (Feb 15, 2005) (5 pages) doi:10.1115/1.1924483 History: Received July 30, 2003; Revised February 15, 2005

A nonlinear continuum damage mechanics model is proposed to assess the high temperature creep life of a steam turbine rotor, in which the effect of mean stress is taken into account and the damage is accumulated nonlinearly. The model is applied to a 300 MW steam turbine under hot start operation. The results are compared with those from the linear accumulation theory that is dominant in the creep life assessment of steam turbine rotors at present. The comparison results show that the nonlinear continuum damage mechanics model describes the accumulation and development of damage better than the linear accumulation theory.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Finite element mesh of high pressure rotor of 300 MW steam turbine

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Figure 2

Start operation curves (5)

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Figure 3

Stress field of high pressure rotor of 300 MW steam turbine at rated load

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Figure 4

Temperature field of high pressure rotor of 300 MW steam turbine at rated load

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Figure 5

Damage evolution for creep of 30Cr1Mo1V at 525°C and σ=200MPa

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Figure 6

Diagram of effects of load sequence for CDM model

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Figure 7

Distribution of triaxial coefficient of 300 MW steam turbine at rated load

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Figure 8

Creep damage comparison of uniaxial and multiaxial CDM model

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