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Stress relaxation experimental research and prediction of GFRP pipes under ring deflection condition

  • Tong Shen

    Tong Shen, born in 1999, received a bachelor’s degree in engineering mechanics from Taiyuan University of Science and Technology in 2022 and is now a master’s student in mechanics at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China. His main research interests include mechanics and application of composite materials.

    , Jianzhong Chen

    Jianzhong Chen, born in 1978, received his MSc and PhD degrees from Wuhan University of Technology in 2005 and 2010. Currently, he is a master tutor at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China and the director of Hubei Province Mechanics Experimental Teaching Demonstration Center. His main research interests include composite mechanics and applications.

    , Yong Lv

    Yong Lv, born in 1982, received his MSc and PhD degrees from Wuhan University of Technology in 2007 and 2011, and he is a senior laboratory technician at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China. His main research interests are composite mechanics and mechanical testing technology.

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    , Xiaoyu Zhang

    Xiaoyu Zhang, born in 1975, received her MSc and PhD degrees from Wuhan University of Technology in 2000 and 2007, respectively. Her main research interests are composite mechanics and structural design. Currently, she is a master tutor at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China.

    and Li Huang

    Li Huang, born in 1967, received her MSc degree from Huazhong University of Science and Technology in 1994 and her PhD from Wuhan University of Technology in 2005. Her main research interests include smart materials and structures, fatigue, and fracture of composite materials. Currently, she is a master tutor at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China.

Published/Copyright: June 12, 2024
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Abstract

Glass fiber-reinforced plastic (GFRP) pipes are widely used as buried pipes in petrochemical and other industries. At present, in-depth studies have been conducted on GFRP pipes in terms of internal hydrostatic pressure, axial compression, and cyclic internal pressure, especially limited research has been carried out on transverse load, especially stress relaxation behavior. In this study, GFRP pipes with three different component contents were subjected to different initial deflections at different temperatures and subjected to stress relaxation tests for 1000 h. The findings demonstrate that the stress relaxation behavior of GFRP pipes is not affected by the initial deflection. Rather, it is primarily influenced by temperature and sand entrapment content, which are identified as the key factors determining the stress relaxation behavior of GFRP pipes. In addition, the time-temperature superposition principle (TTSP) was used to pass the test results to obtain a smooth master curve and verify the applicability of TTSP on GFRP pipes. Subsequently, the relaxation performance of GFRP pipes was predicted after 50 years. This research result contributes to a more comprehensive understanding of the stress relaxation behavior of GFRP through accelerated testing and offers crucial insights into the application of GFRP pipes.


Corresponding author: Yong Lv, Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan 430070, China, E-mail:

About the authors

Tong Shen

Tong Shen, born in 1999, received a bachelor’s degree in engineering mechanics from Taiyuan University of Science and Technology in 2022 and is now a master’s student in mechanics at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China. His main research interests include mechanics and application of composite materials.

Jianzhong Chen

Jianzhong Chen, born in 1978, received his MSc and PhD degrees from Wuhan University of Technology in 2005 and 2010. Currently, he is a master tutor at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China and the director of Hubei Province Mechanics Experimental Teaching Demonstration Center. His main research interests include composite mechanics and applications.

Yong Lv

Yong Lv, born in 1982, received his MSc and PhD degrees from Wuhan University of Technology in 2007 and 2011, and he is a senior laboratory technician at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China. His main research interests are composite mechanics and mechanical testing technology.

Xiaoyu Zhang

Xiaoyu Zhang, born in 1975, received her MSc and PhD degrees from Wuhan University of Technology in 2000 and 2007, respectively. Her main research interests are composite mechanics and structural design. Currently, she is a master tutor at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China.

Li Huang

Li Huang, born in 1967, received her MSc degree from Huazhong University of Science and Technology in 1994 and her PhD from Wuhan University of Technology in 2005. Her main research interests include smart materials and structures, fatigue, and fracture of composite materials. Currently, she is a master tutor at Hubei Key Laboratory of Theory and Application of Advanced Material Mechanics, School of Science, Wuhan University of Technology, Wuhan, China.

  1. Research ethics: Not applicable.

  2. Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  3. Competing interests: The authors state no conflict of interest.

  4. Research funding: The Fundamental Research Funds for the Central Universities (WUT:2021Ⅲ059JC).

  5. Data availability: The raw data can be obtained on request from the corresponding author.

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Published Online: 2024-06-12
Published in Print: 2024-07-26

© 2024 Walter de Gruyter GmbH, Berlin/Boston

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