Crack-tip stress field of fully circumferential cracked pipe under combined tension and thermal loads

Jin Ho Je; Dong Jun Kim; Keun Hyung Bae; Yun Jae Kim

doi:10.1115/PVP201428905

Crack-tip stress field of fully circumferential cracked pipe under combined tension and thermal loads

Jin Ho Je, Dong Jun Kim, Keun Hyung Bae, Yun Jae Kim

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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; Japproach 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
Title of host publication	Codes and Standards
Publisher	American Society of Mechanical Engineers (ASME)
ISBN (Electronic)	9780791845981
DOIs	https://doi.org/10.1115/PVP201428905
Publication status	Published - 2014 Jan 1
Externally published	Yes
Event	ASME 2014 Pressure Vessels and Piping Conference, PVP 2014 - Anaheim, United States Duration: 2014 Jul 20 → 2014 Jul 24

Publication series

Name	American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume	1
ISSN (Print)	0277-027X

Conference

Conference	ASME 2014 Pressure Vessels and Piping Conference, PVP 2014
Country/Territory	United States
City	Anaheim
Period	14/7/20 → 14/7/24

ASJC Scopus subject areas

Mechanical Engineering

Access to Document

10.1115/PVP201428905

Cite this

Je, J. H., Kim, D. J., Bae, K. H., & Kim, Y. J. (2014). Crack-tip stress field of fully circumferential cracked pipe under combined tension and thermal loads. In Codes and Standards (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 1). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP201428905

Crack-tip stress field of fully circumferential cracked pipe under combined tension and thermal loads. / Je, Jin Ho; Kim, Dong Jun; Bae, Keun Hyung et al.
Codes and Standards. American Society of Mechanical Engineers (ASME), 2014. (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Je, JH, Kim, DJ, Bae, KH & Kim, YJ 2014, Crack-tip stress field of fully circumferential cracked pipe under combined tension and thermal loads. in Codes and Standards. American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, vol. 1, American Society of Mechanical Engineers (ASME), ASME 2014 Pressure Vessels and Piping Conference, PVP 2014, Anaheim, United States, 14/7/20. https://doi.org/10.1115/PVP201428905

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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; Japproach 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.

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Crack-tip stress field of fully circumferential cracked pipe under combined tension and thermal loads

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