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Hydrogen gaseous effects on fracture resistance of API-X70 estimated by XFEM

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Abstract

Hydrogen embrittlement has been recognized as one of major degradation mechanisms causing the decrease of ductility and fracture toughness of several kinds of materials. In accordance with the demand for hydrogen fuels, it becomes more important to ensure safety of relevant facilities like pressure vessels, storage tanks and so on. The objective of this study is to examine fracture resistance of American Petroleum Institute (API)-X70 steel under highly pressurized hydrogen gaseous condition. The extended finite element method (XFEM) was adopted to predict J-R curves via a crack growth simulation approach. At first, preliminary analyses for SM490A carbon steel were carried out to demonstrate applicability of the XFEM, of which result was comparable to test data within 14 %. Subsequently, iterative numerical analyses were conducted to calibrate appropriate damage parameters for the API-X70 steel by using notched round bar specimens. Finally, crack growth simulations of 1T-compact tension (CT) specimens were performed adopting the calibrated parameters. JIC values determined from predicted J-R curves were compared with 1/2T-CT CTOD test data and relevant constraint effect was discussed.

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Abbreviations

N I (x) :

Nodal shape function

u I :

Displacement vector

H(x) :

Heaviside function

F α (x) :

Crack tip function

I, a, b, α :

Nodal enriched degree of freedom

T :

Traction vector

5 :

Displacement segment vector

T 0 :

Cohesive strength

δ 0 :

Critical separation

Γ 0 :

Cohesive energy

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Acknowledgments

This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (Grant 19TLRP-C152334-01).

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Authors and Affiliations

  1. Department of Nuclear Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, 17104, Korea

    Dong-Hyun Kim, Jae Min Sim & Yoon-Suk Chang

  2. Division of Industrial Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Korea

    Un Bong Baek

Authors
  1. Dong-Hyun Kim
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  2. Jae Min Sim
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  3. Yoon-Suk Chang
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Corresponding author

Correspondence to Yoon-Suk Chang.

Additional information

Dong-Hyun Kim received his B.S. degree from the Department of Nuclear Engineering in 2020 at Kyung Hee University. Currently he is a M.S. candidate in Kyung Hee University and his research interest is computational fracture mechanics.

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Kim, DH., Sim, J.M., Chang, YS. et al. Hydrogen gaseous effects on fracture resistance of API-X70 estimated by XFEM. J Mech Sci Technol 35, 3829–3835 (2021). https://doi.org/10.1007/s12206-021-2106-7

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  • DOI: https://doi.org/10.1007/s12206-021-2106-7

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