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<p>In accordance with NFT57-900 and DIN-16966 standards, this study examines the internal pressure behavior of an assembled L-shaped E-glass/Vinylester FWP. To characterize a single pipe, three standardized tests are used: compression (ASTM D2412), split-disk (ASTM D2290), and internal pressure (ASTM D1599-99). Non-destructive assessment methods, such as Acoustic Emission (AE) and Scanning Electron Microscopy (SEM), are used in conjunction with these tests to examine the mechanisms of damage. Following this, the same IPT protocol was also performed on the assembled L-shaped pipeline to evaluate its overall structural performance.Experimental results indicate that the pressure response of E-glass/ Vinylester tubes can be described by three phases: (1) an initial linear elastic phase, (2) a nonlinear phase associated with damage propagation, and (3) ultimate failure. The techniques employed to characterize the damage evolution are as follows: First, macroscopic observations provided an initial understanding of the distribution of the failure along the tube. Scanning Electron Microscope revealed the internal failure mechanisms, such as matrix failure, fiber breaking, or even fiber–matrix debonding. Finally, to monitor failure in real time, Acoustic Emission was applied during the internal pressure and Split-Disk tests. This technique reveals the sequence of failure modes and provides insight into the interaction between failure mechanisms. Leakage occurred almost at the same location across all specimens. The dominant modes of damage observed were delamination and matrix failure.</p>

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Experimental Investigation of Damage Modes in Single and Assembled Hybrid Composite Pipes Through Multiple Tests

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Imen Debbabi,
  • Houda Khaterchi,
  • Sonia Braiek,
  • Ated Ben Khalifa

摘要

In accordance with NFT57-900 and DIN-16966 standards, this study examines the internal pressure behavior of an assembled L-shaped E-glass/Vinylester FWP. To characterize a single pipe, three standardized tests are used: compression (ASTM D2412), split-disk (ASTM D2290), and internal pressure (ASTM D1599-99). Non-destructive assessment methods, such as Acoustic Emission (AE) and Scanning Electron Microscopy (SEM), are used in conjunction with these tests to examine the mechanisms of damage. Following this, the same IPT protocol was also performed on the assembled L-shaped pipeline to evaluate its overall structural performance.Experimental results indicate that the pressure response of E-glass/ Vinylester tubes can be described by three phases: (1) an initial linear elastic phase, (2) a nonlinear phase associated with damage propagation, and (3) ultimate failure. The techniques employed to characterize the damage evolution are as follows: First, macroscopic observations provided an initial understanding of the distribution of the failure along the tube. Scanning Electron Microscope revealed the internal failure mechanisms, such as matrix failure, fiber breaking, or even fiber–matrix debonding. Finally, to monitor failure in real time, Acoustic Emission was applied during the internal pressure and Split-Disk tests. This technique reveals the sequence of failure modes and provides insight into the interaction between failure mechanisms. Leakage occurred almost at the same location across all specimens. The dominant modes of damage observed were delamination and matrix failure.