Correlation analysis between time-dependent creep crack-tip stress and constraint effect on creep crack initiation time

Seung Ho Lee; Hyun Woo Jung; Yun Jae Kim; Kamran Nikbin; Robert A. Ainsworth

doi:10.1115/PVP2020-21645

Correlation analysis between time-dependent creep crack-tip stress and constraint effect on creep crack initiation time

Seung Ho Lee, Hyun Woo Jung, Yun Jae Kim, Kamran Nikbin, Robert A. Ainsworth

School of Mechanical Engineering

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

Abstract

In this study, to qualify the constraint effect on creep crack initiation, the correlation analysis between proposed constraint parameter Q' using time-dependent creep crack-tip stress and creep crack initiation time variable Ai was performed. Ai implies the influence of constraint effect on creep crack initiation. The procedure to calculate the Ai and the Q'-parameter was presented. To evaluate various status of constraint effect, creep crack growth tests for twenty-one compact tension specimens of Type 316H stainless steel at 550^oC were investigated. The results of correlation analysis explain the reason for the different initiation time at the same C^* level in respect of constraint effect.

Original language	English
Title of host publication	Materials and Fabrication
Publisher	American Society of Mechanical Engineers (ASME)
ISBN (Electronic)	9780791883860
DOIs	https://doi.org/10.1115/PVP2020-21645
Publication status	Published - 2020
Event	ASME 2020 Pressure Vessels and Piping Conference, PVP 2020 - Virtual, Online Duration: 2020 Aug 3 → …

Publication series

Name	American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume	6
ISSN (Print)	0277-027X

Conference

Conference	ASME 2020 Pressure Vessels and Piping Conference, PVP 2020
City	Virtual, Online
Period	20/8/3 → …

Keywords

Constraint effect
Creep crack initiation
Creep crack initiation time variable
Time-dependent creep crack-tip stress

ASJC Scopus subject areas

Mechanical Engineering

Access to Document

10.1115/PVP2020-21645

Cite this

Lee, S. H., Jung, H. W., Kim, Y. J., Nikbin, K., & Ainsworth, R. A. (2020). Correlation analysis between time-dependent creep crack-tip stress and constraint effect on creep crack initiation time. In Materials and Fabrication Article v006t06a038 (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 6). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2020-21645

Correlation analysis between time-dependent creep crack-tip stress and constraint effect on creep crack initiation time. / Lee, Seung Ho; Jung, Hyun Woo; Kim, Yun Jae et al.
Materials and Fabrication. American Society of Mechanical Engineers (ASME), 2020. v006t06a038 (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 6).

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

Lee, SH, Jung, HW, Kim, YJ, Nikbin, K & Ainsworth, RA 2020, Correlation analysis between time-dependent creep crack-tip stress and constraint effect on creep crack initiation time. in Materials and Fabrication., v006t06a038, American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, vol. 6, American Society of Mechanical Engineers (ASME), ASME 2020 Pressure Vessels and Piping Conference, PVP 2020, Virtual, Online, 20/8/3. https://doi.org/10.1115/PVP2020-21645

Lee SH, Jung HW, Kim YJ, Nikbin K, Ainsworth RA. Correlation analysis between time-dependent creep crack-tip stress and constraint effect on creep crack initiation time. In Materials and Fabrication. American Society of Mechanical Engineers (ASME). 2020. v006t06a038. (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP). doi: 10.1115/PVP2020-21645

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abstract = "In this study, to qualify the constraint effect on creep crack initiation, the correlation analysis between proposed constraint parameter Q' using time-dependent creep crack-tip stress and creep crack initiation time variable Ai was performed. Ai implies the influence of constraint effect on creep crack initiation. The procedure to calculate the Ai and the Q'-parameter was presented. To evaluate various status of constraint effect, creep crack growth tests for twenty-one compact tension specimens of Type 316H stainless steel at 550oC were investigated. The results of correlation analysis explain the reason for the different initiation time at the same C* level in respect of constraint effect.",

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Correlation analysis between time-dependent creep crack-tip stress and constraint effect on creep crack initiation time

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