Impact of prolonged exposure of eleven years to hot seawater on the degradation of a thermoset composite

Amir Hussain Idrisi, Abdel Hamid I. Mourad, Muhammad M. Sherif

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


This paper presents a long-term experimental investigation of E-glass/epoxy composites’ durability exposed to seawater at different temperatures. The thermoset composite samples were exposed to 23C, 45C and 65C seawater for a prolonged exposure time of 11 years. The mechanical performance as a function of exposure time was evaluated and a strength-based technique was used to assess the durability of the composites. The experimental results revealed that the tensile strength of E-glass/epoxy composite was reduced by 8.2%, 29.7%, and 54.4% after immersion in seawater for 11 years at 23C, 45C, and 65C, respectively. The prolonged immersion in seawater resulted in the plasticization and swelling in the composite. This accelerated the rate of debonding between the fibers and matrix. The failure analysis was conducted to investigate the failure mode of the samples. SEM micrographs illustrated a correlation between the fiber/matrix debonding, potholing, fiber pull-out, river line marks and matrix cracking with deterioration in the tensile characteristics of the thermoset composite.

Original languageEnglish
Article number2154
Issue number13
Publication statusPublished - Jul 1 2021


  • Durability
  • E-glass/epoxy composite
  • Mechanical properties
  • Microstructural analysis
  • Seawater

ASJC Scopus subject areas

  • General Chemistry
  • Polymers and Plastics


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