Comparison of R6 and A16 J estimation methods under combined mechanical and thermal loads with FE results

Hyun Suk Nam; Chang Young Oh; Yun Jae Kim; Dong Wook Jerng; Robert A. Ainsworth; Peter J. Budden; Stéphane Marie

doi:10.1016/j.ijpvp.2015.09.002

Comparison of R6 and A16 J estimation methods under combined mechanical and thermal loads with FE results

Hyun Suk Nam, Chang Young Oh, Yun Jae Kim, Dong Wook Jerng, Robert A. Ainsworth, Peter J. Budden, Stéphane Marie

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

This paper compares elastic-plastic values of J calculated using the methods in the UK R6 and the French A16 fitness-for-service procedures with FE results for a vessel with a circumferential surface crack under axial tension and a radial thermal gradient. In the FE analyses, the relative magnitudes and loading sequence of mechanical and thermal loads are systematically varied, together with the material strain hardening exponent. Fully circumferential and semi-elliptical surface crack with two relative crack depths are considered. It is found that the R6 estimates are overall accurate but can be non-conservative at large L_r. The A16 estimates are more conservative than the R6 estimates at small L_r but are conservative even at large L_r. Possible sources of conservatism and non-conservatism in R6 and A16 are discussed.

Original language	English
Pages (from-to)	12-25
Number of pages	14
Journal	International Journal of Pressure Vessels and Piping
Volume	135-136
DOIs	https://doi.org/10.1016/j.ijpvp.2015.09.002
Publication status	Published - 2015 Nov

Bibliographical note

Funding Information:
This research is supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. 2007–0056094 , NRF-2013M2A7A1076396 , NRF-2013M2A8A1040924 ).

Publisher Copyright:
© 2015 Elsevier Ltd.

Keywords

A16
Circumferential cracked vessel
Combined mechanical and thermal loading
Elastic-plastic J
Finite element analysis
R6

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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10.1016/j.ijpvp.2015.09.002

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title = "Comparison of R6 and A16 J estimation methods under combined mechanical and thermal loads with FE results",

abstract = "This paper compares elastic-plastic values of J calculated using the methods in the UK R6 and the French A16 fitness-for-service procedures with FE results for a vessel with a circumferential surface crack under axial tension and a radial thermal gradient. In the FE analyses, the relative magnitudes and loading sequence of mechanical and thermal loads are systematically varied, together with the material strain hardening exponent. Fully circumferential and semi-elliptical surface crack with two relative crack depths are considered. It is found that the R6 estimates are overall accurate but can be non-conservative at large Lr. The A16 estimates are more conservative than the R6 estimates at small Lr but are conservative even at large Lr. Possible sources of conservatism and non-conservatism in R6 and A16 are discussed.",

keywords = "A16, Circumferential cracked vessel, Combined mechanical and thermal loading, Elastic-plastic J, Finite element analysis, R6",

author = "Nam, {Hyun Suk} and Oh, {Chang Young} and Kim, {Yun Jae} and Jerng, {Dong Wook} and Ainsworth, {Robert A.} and Budden, {Peter J.} and St{\'e}phane Marie",

note = "Funding Information: This research is supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. 2007–0056094 , NRF-2013M2A7A1076396 , NRF-2013M2A8A1040924 ). Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

year = "2015",

month = nov,

doi = "10.1016/j.ijpvp.2015.09.002",

language = "English",

volume = "135-136",

pages = "12--25",

journal = "International Journal of Pressure Vessels and Piping",

issn = "0308-0161",

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AU - Nam, Hyun Suk

AU - Oh, Chang Young

AU - Kim, Yun Jae

AU - Jerng, Dong Wook

AU - Ainsworth, Robert A.

AU - Budden, Peter J.

AU - Marie, Stéphane

N1 - Funding Information: This research is supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. 2007–0056094 , NRF-2013M2A7A1076396 , NRF-2013M2A8A1040924 ). Publisher Copyright: © 2015 Elsevier Ltd.

PY - 2015/11

Y1 - 2015/11

N2 - This paper compares elastic-plastic values of J calculated using the methods in the UK R6 and the French A16 fitness-for-service procedures with FE results for a vessel with a circumferential surface crack under axial tension and a radial thermal gradient. In the FE analyses, the relative magnitudes and loading sequence of mechanical and thermal loads are systematically varied, together with the material strain hardening exponent. Fully circumferential and semi-elliptical surface crack with two relative crack depths are considered. It is found that the R6 estimates are overall accurate but can be non-conservative at large Lr. The A16 estimates are more conservative than the R6 estimates at small Lr but are conservative even at large Lr. Possible sources of conservatism and non-conservatism in R6 and A16 are discussed.

AB - This paper compares elastic-plastic values of J calculated using the methods in the UK R6 and the French A16 fitness-for-service procedures with FE results for a vessel with a circumferential surface crack under axial tension and a radial thermal gradient. In the FE analyses, the relative magnitudes and loading sequence of mechanical and thermal loads are systematically varied, together with the material strain hardening exponent. Fully circumferential and semi-elliptical surface crack with two relative crack depths are considered. It is found that the R6 estimates are overall accurate but can be non-conservative at large Lr. The A16 estimates are more conservative than the R6 estimates at small Lr but are conservative even at large Lr. Possible sources of conservatism and non-conservatism in R6 and A16 are discussed.

KW - A16

KW - Circumferential cracked vessel

KW - Combined mechanical and thermal loading

KW - Elastic-plastic J

KW - Finite element analysis

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JO - International Journal of Pressure Vessels and Piping

JF - International Journal of Pressure Vessels and Piping

ER -

Comparison of R6 and A16 J estimation methods under combined mechanical and thermal loads with FE results

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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