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Study on the creep properties of butt fusion–welded joints of HDPE pipes using the nanoindentation test

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Abstract

High-density polyethylene (HDPE) pipes have become the preferred water pipes in nuclear power plants. Since the butt fusion–welded joint of HDPE pipes is a weak link of a piping system, it is essential to study the creep properties of the welded joint. In this study, the creep properties of the welded joint of HDPE pipes were studied using a nanoindentation creep test. The test results showed that the weakest creep resistance was not located in the weld center, but was a little away from the weld center. The power-law creep constitutive model was constructed at different locations of the welded joint based on the test results. In addition, the hardness of the welded joint was tested. The results showed that the hardness of the welded joint could reflect the creep resistance of the welded joint.

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Abbreviations

A :

Projected contact area

c :

Constant depending upon the geometry of the indenter

F :

Applied load

H :

Hardness

h :

Contact depth

h pc :

Creep displacement

n :

Power-law creep stress exponent

\(\dot{\varepsilon}\) :

Creep strain rate

σ :

Stress

λ :

Power-law creep constant

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Acknowledgements

This work was supported by the Project of the National Natural Science Foundation of China (51705078) and the Fundamental Research Foundation of Sun Yat-sen University in 2019 (19lgpy300).

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Authors and Affiliations

  1. Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China

    Huan Sheng Lai

  2. China Nuclear Power Design Co., Ltd., Shenzhen, 518031, China

    Shushan Chen

  3. School of Chemical Engineering, Fuzhou University, Fuzhou, 350116, China

    Rong Lin & Xie Hang Duan

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  1. Shushan Chen
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  2. Huan Sheng Lai
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  3. Rong Lin
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  4. Xie Hang Duan
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Correspondence to Huan Sheng Lai.

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Recommended for publication by Commission XI - Pressure Vessels, Boilers, and Pipelines

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Chen, S., Lai, H.S., Lin, R. et al. Study on the creep properties of butt fusion–welded joints of HDPE pipes using the nanoindentation test. Weld World 66, 135–144 (2022). https://doi.org/10.1007/s40194-021-01186-0

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  • DOI: https://doi.org/10.1007/s40194-021-01186-0

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