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<p>The fatigue, creep, and thermal conductivity performance of epoxy composites reinforced with <i>Pueraria phaseoloides</i> stem fiber and polysilicon dust–derived Si₃N₄ particles were investigated. Prior to fabrication, both the fibers and filler particles were subjected to alkaline treatment followed by silane surface modification to enhance interfacial bonding and dispersion within the epoxy matrix. All composites contained a constant fiber content of 30 vol.% (EC), while the Si₃N₄ particle content was varied as EC0 (0.5 vol.%), EC1 (1.5 vol.%), EC2 (2.5 vol.%), EC3 (3.5 vol.%), and EC4 (4.5 vol.%). Mechanical and thermophysical tests were conducted in accordance with ASTM standards and compared with a neat epoxy reference sample. The results showed a systematic improvement in creep resistance and thermal conductivity with increasing Si₃N₄ content. The EC4 composite exhibited the highest thermal conductivity of 0.519 W/mK, representing an increase of approximately 101% compared with neat epoxy (0.258 W/mK). The same composite also showed the lowest creep strain values of 0.0036, 0.0108, and 0.0143 at 5000&#xa0;s, 10,000&#xa0;s, and 15,000&#xa0;s, corresponding to reductions of about 61%, 27%, and 19%, respectively, relative to pure epoxy. In contrast, the EC2 composite demonstrated superior fatigue performance, achieving fatigue lives of 29,138, 28,935, and 28,320 cycles under 25%, 50%, and 75% ultimate tensile stress (UTS) loading, which correspond to improvements of approximately 211%, 256%, and 334%, respectively, over the neat epoxy system. Scanning Electron Microscopy (SEM) analysis confirmed uniform dispersion of Si₃N₄ particles and strong fiber–matrix interfacial adhesion, validating the effectiveness of the surface treatments in enhancing load transfer, suppressing deformation mechanisms, and improving thermal transport in the developed hybrid composites.</p>

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Fatigue, Creep, and Thermal Conductivity Analysis of Epoxy Composites Reinforced with Pueraria phaseoloides Stem Fiber and Si3N4 Particles Derived from Polysilicon Dust

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Dipti N. Kashyap,
  • L. Karthick,
  • S.A.Deepak,
  • Nalla Bhanu Teja,
  • R. Prasanna Venkatesh,
  • L. K. Joshila Grace,
  • G. H. Waghmare,
  • L. Ganesh Babu

摘要

The fatigue, creep, and thermal conductivity performance of epoxy composites reinforced with Pueraria phaseoloides stem fiber and polysilicon dust–derived Si₃N₄ particles were investigated. Prior to fabrication, both the fibers and filler particles were subjected to alkaline treatment followed by silane surface modification to enhance interfacial bonding and dispersion within the epoxy matrix. All composites contained a constant fiber content of 30 vol.% (EC), while the Si₃N₄ particle content was varied as EC0 (0.5 vol.%), EC1 (1.5 vol.%), EC2 (2.5 vol.%), EC3 (3.5 vol.%), and EC4 (4.5 vol.%). Mechanical and thermophysical tests were conducted in accordance with ASTM standards and compared with a neat epoxy reference sample. The results showed a systematic improvement in creep resistance and thermal conductivity with increasing Si₃N₄ content. The EC4 composite exhibited the highest thermal conductivity of 0.519 W/mK, representing an increase of approximately 101% compared with neat epoxy (0.258 W/mK). The same composite also showed the lowest creep strain values of 0.0036, 0.0108, and 0.0143 at 5000 s, 10,000 s, and 15,000 s, corresponding to reductions of about 61%, 27%, and 19%, respectively, relative to pure epoxy. In contrast, the EC2 composite demonstrated superior fatigue performance, achieving fatigue lives of 29,138, 28,935, and 28,320 cycles under 25%, 50%, and 75% ultimate tensile stress (UTS) loading, which correspond to improvements of approximately 211%, 256%, and 334%, respectively, over the neat epoxy system. Scanning Electron Microscopy (SEM) analysis confirmed uniform dispersion of Si₃N₄ particles and strong fiber–matrix interfacial adhesion, validating the effectiveness of the surface treatments in enhancing load transfer, suppressing deformation mechanisms, and improving thermal transport in the developed hybrid composites.