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Research Papers

Analysis of Rotating Components Based on a Characteristic Strain Model of Creep

[+] Author and Article Information
Mariusz Banaszkiewicz

The Szewalski Institute of Fluid-Flow Machinery,
Polish Academy of Sciences,
Fiszera 14,
Gdańsk 80-231, Poland;
ALSTOM Power Ltd.,
Stoczniowa 2,
Elbląg 82-300, Poland
e-mail: mbanaszkiewicz@imp.gda.pl

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received July 9, 2015; final manuscript received January 27, 2016; published online March 22, 2016. Assoc. Editor: Vadim V. Silberschmidt.

J. Eng. Mater. Technol 138(3), 031004 (Mar 22, 2016) (11 pages) Paper No: MATS-15-1159; doi: 10.1115/1.4032661 History: Received July 09, 2015; Revised January 27, 2016

This paper discusses the application of a characteristic strain model (CSM) to analyze the creep behavior of rotating components. First, simple cylinders are analyzed at variable loads and different model constants. A closed-form analytical solution for the steady-state stress and the location of the skeletal point in the rotating solid cylinder are obtained. Then, the hollow cylinder behavior is investigated by numerical analysis, and the skeletal point location is shown to be independent of the applied load. Finally, a numerical creep analysis of a steam turbine rotor is carried out with a detailed examination of the stress and creep strain fields in the rotor disk. The existence of multiple skeletal points in the rotor disk, as well as the independence of their locations of the creep data, is shown.

Copyright © 2016 by ASME
Topics: Creep , Stress , Cylinders , Disks
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References

Viswanathan, R. , 1989, Damage Mechanisms and Life Assessment of High-Temperature Components, ASM International, Metals Park, OH.
Viswanathan, R. , and Stringer, J. , 2000, “ Failure Mechanisms of High Temperature Components in Power Plants,” ASME J. Eng. Mater. Technol., 122(3), pp. 246–255. [CrossRef]
Yao, H. T. , Xuan, F. Z. , Wang, Z. , and Tu, S. T. , 2007, “ A Review of Creep Analysis and Design Under Multi-Axial Stress States,” Nucl. Eng. Des., 237(18), pp. 1969–1986. [CrossRef]
Holdsworth, S. R. , Askins, M. , Baker, A. , Gariboldi, E. , Holmström, S. , Klenk, A. , Ringel, M. , Merckling, G. , Sandstrom, R. , Schwienheer, M. , and Spigarelli, S. , 2008, “ Factors Influencing Creep Model Equation Selection,” Int. J. Pressure Vessels Piping, 85, pp. 80–88. [CrossRef]
Bolton, J. , 2005, “ A ‘Characteristic Strain’ Model for Creep,” ECCC/IMechE Creep and Fracture in High Temperature Components—Design and Life Assessment Issues Conference, London, Sept. 12–14.
Bolton, J. , 2008, “ Analysis of Structures Based on a Characteristic-Strain Model of Creep,” Int. J. Pressure Vessels Piping, 85, pp. 108–116. [CrossRef]
Banaszkiewicz, M. , 2015, “ Multilevel Approach to Lifetime Assessment of Steam Turbines,” Int. J. Fatigue, 73, pp. 39–47. [CrossRef]
Boyle, J. T. , 2011, “ The Behaviour of Structures Based on the Characteristic Strain Model of Creep,” Int. J. Pressure Vessels Piping, 88, pp. 473–481. [CrossRef]
Gupta, V. K. , Singh, S. B. , Chandrawat, H. N. , and Ray, S. , 2005, “ Modeling of Creep Behavior of a Rotating Disc in the Presence of Both Composition and Thermal Gradients,” ASME J. Eng. Mater. Technol., 127(1), pp. 97–105. [CrossRef]
Norton, F. H. , 1929, The Creep of Steel at High Temperatures, McGraw-Hill, London.
Bonora, N. , and Esposito, L. , 2010, “ Mechanism Based Creep Model Incorporating Damage,” ASME J. Eng. Mater. Technol., 132(2), p. 021013. [CrossRef]
Chmielniak, T. , Kosman, G. , and Rusin, A. , 1990, Creep of Thermal Turbines Components, WNT, Warsaw, Poland (in Polish).
Webster, G. A. , and Ainsworth, R. A. , 1994, High Temperature Component Life Assessment, Chapman & Hall, London.
Lipka, J. , 1967, Strength of Rotating Machinery, WNT, Warsaw, Poland (in Polish).
Boyle, J. T. , 2012, “ The Creep Behaviour of Simple Structures With a Stress Range-Dependent Constitutive Model,” Arch. Appl. Mech., 82(4), pp. 495–514. [CrossRef]
Binda, L. , Holdsworth, S. R. , and Mazza, E. , 2010, “ The Exhaustion of Creep Ductility in 1CrMoV Steel,” Int. J. Pressure Vessels Piping, 87(6), pp. 319–325. [CrossRef]

Figures

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Fig. 1

Creep strain versus the ratio of the applied stress to the rupture stress [5]. ECCC P91 data at (a) 550 °C and (b) 600 °C.

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Fig. 2

Time-independent stress distribution in a solid cylinder under steady-state creep

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Fig. 3

Elastic and relaxed stress distributions in a solid cylinder at different loads

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Fig. 4

Mises stress distributions across a cylinder section at different times

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Fig. 5

Radial stress distributions across a cylinder section at different times

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Fig. 6

Circumferential stress distributions across a cylinder section at different times

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Fig. 7

Axial stress distributions across a cylinder section at different times

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Fig. 8

Equivalent creep strain distributions across a cylinder section at different times

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Fig. 9

Variation in the time of creep strain and creep strain rate at the cylinder surface and bore

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Fig. 10

Stress distributions across a cylinder section at steady-state creep

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Fig. 11

Mises stress distributions across a cylinder section at different times

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Fig. 12

Circumferential stress distributions across a cylinder section at different times

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Fig. 13

Mises stress distributions across a cylinder section for different constants of the creep model

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Fig. 14

Variation of the normalized von Mises stress across a cylinder section for various speeds

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Fig. 15

Variation of the normalized circumferential stress across a cylinder section for various speeds

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Fig. 16

Steady-state temperature distribution in a steam turbine rotor

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Fig. 17

Detailed view of the control stage disk

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Fig. 18

Von Mises stress distribution at the elastic state (t = 0) and after 1000, 50,000, and 300,000 hrs

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Fig. 19

Variation of the von Mises stress with time at four characteristic locations

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Fig. 20

Von Mises stress distributions across a disk radial section at different times

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Fig. 21

Von Mises stress distributions across a disk axial section at different times

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Fig. 22

Von Mises stress distributions at steady-state for minimum, mean, and maximum creep data

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Fig. 23

Von Mises equivalent creep strain distributions after 100, 1000, 50,000, and 300,000 hrs

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Fig. 24

Variation of the von Mises equivalent creep strain with time at four characteristic locations

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