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Research Papers: Design and Analysis

Development of Inverse Analysis Method of Heat Conduction and Thermal Stress for Elbow—Part II

[+] Author and Article Information
Kiminobu Hojo

Mitsubishi Heavy Industries,
1-1, Wadasaki-cho 1-chome,
Hyogo-ku,
Kobe 652-8585, Japan
e-mail: kiminobu_hojo@mhi.co.jp

Mayumi Ochi

Mitsubishi Heavy Industries,
1-1, Niihama 2-chome,
Arai-cho,
Takasago 676-8686, Japan
e-mail: mayumi_ochi@mhi.co.jp

Seiji Ioka

Department of Engineering,
Osaka Electro-Communication University,
18-8, Hatsu-cho,
Neyagawa 572-8530, Japan
e-mail: ioka@isc.osakac.ac.jp

Shiro Kubo

Department of Science and Engineering,
Setsunan University,
17-8, Ikeda-nakamachi,
Neyagawa 572-8508, Japan
e-mail: kubo@mech.eng.osaka-u.ac.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 25, 2015; final manuscript received November 8, 2015; published online May 4, 2016. Assoc. Editor: Albert E. Segall.

J. Pressure Vessel Technol 138(5), 051207 (May 04, 2016) (7 pages) Paper No: PVT-15-1052; doi: 10.1115/1.4032200 History: Received March 25, 2015; Revised November 08, 2015

An inverse heat conduction analysis method for piping elbow was developed to estimate the temperature and stress distribution on the inner surface by measuring the outer surface temperature. In the paper, the accuracy for the thermal stress calculation using the inverse heat conduction analysis method was confirmed by comparing with the reference results from normal FE heat conduction and thermal stress analyses. In the case of the measured-basis fluid temperature input from a high temperature–pressure test, the inverse analysis method estimated the maximum stress change by 7% conservative comparing with the normal FE analyses.

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References

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Figures

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Fig. 1

Validation flow of inverse analysis method

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Fig. 2

Assumed thermal stratification pattern with time change

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Fig. 3

Thermal stratification for validation of inverse analysis method: (a) fluid time-average temperature distribution image and notations, (b) temperature distribution of vertical direction, and (c) time change of center of stratification

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Fig. 4

Measurement cross section and points of high temperature and pressure test

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Fig. 5

Fluid time-average temperature

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Fig. 6

FE analysis model (heat conduction and thermal stress analyses)

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Fig. 7

Comparison of temperature on inner surface between inverse analysis method and reference FE analysis (pattern 1): (a) temperature-time change on inner surface and (b) RMS of temperature difference between two methods

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Fig. 8

Comparison of temperature on inner surface between inverse analysis method and reference FE analysis (based on high temperature–pressure test): (a) temperature-time change on inner surface and (b) RMS of temperature difference between two methods

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Fig. 9

Tresca stress contours at the maximum stress change on the inner surface (pattern 1): (a) reference FE analysis and (b) inverse analysis method

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Fig. 10

Tresca stress contours at the maximum stress change on the inner surface (based on high temperature–pressure test): (a) reference FE analysis and (b) inverse analysis method

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Fig. 11

Increase of temperature measurement points: (a) original measurement locations and (b) increased measurement locations

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