Crack-Tip Stress Field of Cracked Pipe under Combined Tension and Thermal Load

J. H. Je; H. S. Lee; D. J. Kim; Y. J. Kim

doi:10.1016/j.proeng.2015.12.339

Crack-Tip Stress Field of Cracked Pipe under Combined Tension and Thermal Load

J. H. Je, H. S. Lee, D. J. Kim, Y. J. Kim

Research output: Contribution to journal › Conference article › peer-review

Abstract

In the presence of excessive plasticity, the fracture toughness depends on the size and geometry. For material under fully yielded conditions, the stresses near the crack tip are not unique, but depend on geometry. So Single-parameter; J-approach is limited to high-constraint crack geometry. J-Q theory has been proposed in order to decide crack geometry constraint. This approach assumes that the crack-tip fields have two degrees of freedom. In this paper, based on J-Q theory, crack-tip stress field of fully circumferential cracked pipe under combined load is investigated using FE analysis. Combined loads are tensile axial force and thermal gradient of radial direction. Q-stresses of a crack geometry and it's loading state are used to determine constraint effect, and give a characteristic order for crack-tip constraint.

Original language	English
Pages (from-to)	1686-1694
Number of pages	9
Journal	Procedia Engineering
Volume	130
DOIs	https://doi.org/10.1016/j.proeng.2015.12.339
Publication status	Published - 2015
Event	14th International Conference on Pressure Vessel Technology, 2015 - Shanghai, China Duration: 2015 Sept 23 → 2015 Sept 26

Bibliographical note

Publisher Copyright:
© 2015 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

Keywords

Combined load
Crack-tip Constraint
Cracked pipe
Q-stress

ASJC Scopus subject areas

General Engineering

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10.1016/j.proeng.2015.12.339

Cite this

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title = "Crack-Tip Stress Field of Cracked Pipe under Combined Tension and Thermal Load",

abstract = "In the presence of excessive plasticity, the fracture toughness depends on the size and geometry. For material under fully yielded conditions, the stresses near the crack tip are not unique, but depend on geometry. So Single-parameter; J-approach is limited to high-constraint crack geometry. J-Q theory has been proposed in order to decide crack geometry constraint. This approach assumes that the crack-tip fields have two degrees of freedom. In this paper, based on J-Q theory, crack-tip stress field of fully circumferential cracked pipe under combined load is investigated using FE analysis. Combined loads are tensile axial force and thermal gradient of radial direction. Q-stresses of a crack geometry and it's loading state are used to determine constraint effect, and give a characteristic order for crack-tip constraint.",

keywords = "Combined load, Crack-tip Constraint, Cracked pipe, Q-stress",

author = "Je, {J. H.} and Lee, {H. S.} and Kim, {D. J.} and Kim, {Y. J.}",

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year = "2015",

doi = "10.1016/j.proeng.2015.12.339",

language = "English",

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journal = "Procedia Engineering",

issn = "1877-7058",

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TY - JOUR

T1 - Crack-Tip Stress Field of Cracked Pipe under Combined Tension and Thermal Load

AU - Je, J. H.

AU - Lee, H. S.

AU - Kim, D. J.

AU - Kim, Y. J.

PY - 2015

Y1 - 2015

N2 - In the presence of excessive plasticity, the fracture toughness depends on the size and geometry. For material under fully yielded conditions, the stresses near the crack tip are not unique, but depend on geometry. So Single-parameter; J-approach is limited to high-constraint crack geometry. J-Q theory has been proposed in order to decide crack geometry constraint. This approach assumes that the crack-tip fields have two degrees of freedom. In this paper, based on J-Q theory, crack-tip stress field of fully circumferential cracked pipe under combined load is investigated using FE analysis. Combined loads are tensile axial force and thermal gradient of radial direction. Q-stresses of a crack geometry and it's loading state are used to determine constraint effect, and give a characteristic order for crack-tip constraint.

AB - In the presence of excessive plasticity, the fracture toughness depends on the size and geometry. For material under fully yielded conditions, the stresses near the crack tip are not unique, but depend on geometry. So Single-parameter; J-approach is limited to high-constraint crack geometry. J-Q theory has been proposed in order to decide crack geometry constraint. This approach assumes that the crack-tip fields have two degrees of freedom. In this paper, based on J-Q theory, crack-tip stress field of fully circumferential cracked pipe under combined load is investigated using FE analysis. Combined loads are tensile axial force and thermal gradient of radial direction. Q-stresses of a crack geometry and it's loading state are used to determine constraint effect, and give a characteristic order for crack-tip constraint.

KW - Combined load

KW - Crack-tip Constraint

KW - Cracked pipe

KW - Q-stress

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U2 - 10.1016/j.proeng.2015.12.339

DO - 10.1016/j.proeng.2015.12.339

M3 - Conference article

AN - SCOPUS:84964010063

SN - 1877-7058

VL - 130

SP - 1686

EP - 1694

JO - Procedia Engineering

JF - Procedia Engineering

T2 - 14th International Conference on Pressure Vessel Technology, 2015

Y2 - 23 September 2015 through 26 September 2015

ER -

Crack-Tip Stress Field of Cracked Pipe under Combined Tension and Thermal Load

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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