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Research Papers: Materials and Fabrication

Evaluation of Simplified Creep Design Methods Based on the Case Analysis of Tee Joint at Elevated Temperature

[+] Author and Article Information
Jian-Guo Gong

School of Mechanical and Power Engineering,
East China University of
Science and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: jggong@ecust.edu.cn

Qi-Wei Xia

School of Mechanical and Power Engineering,
East China University of
Science and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: xia_qiwei@163.com

Fu-Zhen Xuan

School of Mechanical and Power Engineering,
East China University of
Science and Technology,
130 Meilong Road,
Shanghai 200237, China
e-mail: fzxuan@ecust.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 23, 2016; final manuscript received April 14, 2017; published online June 1, 2017. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 139(4), 041412 (Jun 01, 2017) (10 pages) Paper No: PVT-16-1245; doi: 10.1115/1.4036533 History: Received December 23, 2016; Revised April 14, 2017

Based on a tee joint, the simplified creep design methods of ASME code, elastic-perfectly plastic (EPP) analysis of Code Case N-861 (CC N-861) and the inelastic analysis by isochronous stress strain (ISS) curve, were evaluated and compared to nonlinear finite element creep analysis (FECA). Results indicate that both EPP and FECA lead to a greater inelastic strain than ISS curve-based results. By contrast, the ISS-based analysis induces a smaller usage fraction (damage) than FECA due to the underestimated inelastic strain. In addition, the smallest usage fraction (damage) is obtained by using EPP analysis of CC N-861 in which case the remarkable bending strain is involved.

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References

Figures

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Fig. 1

Finite element model of tee joint at elevated temperature: (a) Mesh model and boundary conditions and (b) loading history

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Fig. 2

Stress–strain curve for 316SS at 600 °C [15]

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Fig. 3

Isochronous stress–strain curve for 316SS at 600 °C

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Fig. 4

Flow diagram for inelastic analysis based on Code Case N-861

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Fig. 5

Methodology for elastic-perfectly plastic analysis based on various target inelastic strains in Code Case N-861

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Fig. 6

Relationship between the normalized inelastic strain distribution and the distance along with the chosen path under various internal pressures

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Fig. 7

Relationship between maximum principle stress and maximum principle strain for the chosen path at various internal pressures: (a) internal pressure of 0.5 MPa and (b) internal pressure of 2.0 MPa

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Fig. 8

von Mises stress and total inelastic strain distributions for tee joint with target inelastic strain of 0.5% (p/p0 = 2.0): (a) von Mises stress and (b) total inelastic strain

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Fig. 9

von Mises stress and total inelastic strain distributions for tee joint with target inelastic strain of 0.002% (p/p0 = 0.5): (a) von Mises stress and (b) total inelastic strain

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Fig. 10

Total inelastic strain distributions along with path A for various target inelastic strains (p/p0 = 2.0)

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Fig. 11

Plastic strain and averaged strain for various target inelastic strains (p/p0 = 2.0)

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Fig. 12

Total inelastic strain distributions along with path A for various target inelastic strains (p/p0 = 0.5)

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Fig. 13

Plastic strain and average strain calculated for various target inelastic strains (p/p0 = 0.5)

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Fig. 14

von Mises stress and inelastic strain distributions of tee joint based on nonlinear finite element creep analysis (p/p0 = 2.0): (a) von Mises stress and (b) inelastic strain

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Fig. 15

von Mises stress and equivalent plastic strain distributions of tee joint based on isochronous stress strain curve (p/p0 = 2.0): (a) von Mises stress and (b) equivalent plastic strain

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Fig. 16

Difference of material model between inelastic analysis based on ISS curve and the EPP analysis in CC N-861

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Fig. 17

Inelastic strain distributions for nonlinear finite element creep analysis and two simplified creep design methods (p/p0 = 0.5)

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Fig. 18

Usage fraction (damage) for nonlinear finite element creep analysis and simplified creep design method (p/p0 = 0.5)

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Fig. 19

Mechanism for difference between EPP analysis and nonlinear finite element creep analysis (p/p0 = 0.5)

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Fig. 20

Inelastic strain distributions for nonlinear finite element creep analysis and two simplified creep design methods (p/p0 = 2.0)

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Fig. 21

Usage fraction (damage) for nonlinear finite element creep analysis and two simplified creep design methods (p/p0 = 2.0)

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