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<p>Biocomposites are gaining significant interest due to their low density, cost-effectiveness, high strength, and stiffness. This investigation examine the fatigue, mechanical, tribological, and flammability performance of composites fabricated using lignin extracted from sugarcane hard stems and natural bagasse microfibers. The composites were prepared via the hand layup method, and precise test specimens were produced. All specimens were characterized according to ASTM standards. Mechanical testing revealed that increasing lignin content enhanced tensile and flexural strengths. The optimized composite (VLB2) showed tensile and flexural strengths of 163&#xa0;MPa and 185&#xa0;MPa, representing improvements of 25.38% and 21.71%, respectively. Izod impact resistance reached 5.2&#xa0;J, improving 37.57%. Fatigue tests indicated superior resistance, with the composite enduring 41,000 cycles (1950%) at 25% ultimate tensile stress, 38,500 cycles (2067%) at 50% UTS, and 35,000 cycles (2213%) at 75% UTS. Hardness increased consistently, VLB3 with the highest Shore-D value of 86, improving 10.3%. Time-dependent deformation decreased to 0.0010 (50%), 0.0020 (69%), and 0.0040 (58%) at 5000&#xa0;s, 10,000&#xa0;s, and 15,000&#xa0;s, respectively. Flammability tests showed all composites achieved a horizontal burning rating of HB, while vertical burning was 7.08&#xa0;s, 15.3% slower. Tribological testing demonstrated a specific wear rate of 0.15&#xa0;mm³/Nm (38.6%) and a coefficient of friction (COF) of 0.18 (57.1%). Scanning electron microscopy confirmed improved fiber-matrix adhesion and microstructural reinforcement. Overall, lignin incorporation effectively enhances mechanical, thermal, and tribological properties, emphasizing the importance of optimized composition for durable biocomposites.</p>

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Effect of sugarcane lignin and Bagasse fiber on the mechanical and thermal performance of vinyl ester composites

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • S. Lakshmana kumar,
  • S. Kaliappan,
  • L. Natrayan,
  • M Muthukannan

摘要

Biocomposites are gaining significant interest due to their low density, cost-effectiveness, high strength, and stiffness. This investigation examine the fatigue, mechanical, tribological, and flammability performance of composites fabricated using lignin extracted from sugarcane hard stems and natural bagasse microfibers. The composites were prepared via the hand layup method, and precise test specimens were produced. All specimens were characterized according to ASTM standards. Mechanical testing revealed that increasing lignin content enhanced tensile and flexural strengths. The optimized composite (VLB2) showed tensile and flexural strengths of 163 MPa and 185 MPa, representing improvements of 25.38% and 21.71%, respectively. Izod impact resistance reached 5.2 J, improving 37.57%. Fatigue tests indicated superior resistance, with the composite enduring 41,000 cycles (1950%) at 25% ultimate tensile stress, 38,500 cycles (2067%) at 50% UTS, and 35,000 cycles (2213%) at 75% UTS. Hardness increased consistently, VLB3 with the highest Shore-D value of 86, improving 10.3%. Time-dependent deformation decreased to 0.0010 (50%), 0.0020 (69%), and 0.0040 (58%) at 5000 s, 10,000 s, and 15,000 s, respectively. Flammability tests showed all composites achieved a horizontal burning rating of HB, while vertical burning was 7.08 s, 15.3% slower. Tribological testing demonstrated a specific wear rate of 0.15 mm³/Nm (38.6%) and a coefficient of friction (COF) of 0.18 (57.1%). Scanning electron microscopy confirmed improved fiber-matrix adhesion and microstructural reinforcement. Overall, lignin incorporation effectively enhances mechanical, thermal, and tribological properties, emphasizing the importance of optimized composition for durable biocomposites.