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<p>This study investigates the dynamic compressive behaviour of laminated kenaf/Kevlar hybrid composites, emphasizing the influence of stacking sequence and Kevlar incorporation. Five laminate configurations—pure kenaf (KF), pure Kevlar (KV) and three hybrids (KVA, KVB, KVC)—were fabricated through hand layup and vacuum bagging and tested using a Split Hopkinson Pressure Bar (SHPB) at 1.2, 1.4, and 1.6&#xa0;bar. KF exhibited the highest strain rate sensitivity confirming its ability to strengthen under elevated strain rates. KV, despite high tensile strength of Kevlar fiber showed lowest compressive strength (26.90–34.23&#xa0;MPa) and limited ductility. Among the hybrids, KVB demonstrated the best performance achieving maximum stress of 46.94&#xa0;MPa at 1.6&#xa0;bar and 144–289% increase in ductility compared with KV attributed to effective load confinement by the Kevlar outer layers and progressive crushing of the kenaf inner layer. KVA remained consistently weaker than KVB, underscoring the importance of Kevlar placement while KVC demonstrated 35% lower strength and 26–61% less ductile than KF but stronger and more ductile than KV. These findings confirm that stacking sequence influences hybrid composite response under high strain rate loading providing insights for developing lightweight, impact-resistant natural-synthetic hybrid composites.</p>

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Effect of stacking sequence and addition of Kevlar in Kenaf laminated composite under dynamic compression

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Siti Nuha Majiddah Abdul Aziz,
  • Sareh Aiman Hilmi Abu Seman

摘要

This study investigates the dynamic compressive behaviour of laminated kenaf/Kevlar hybrid composites, emphasizing the influence of stacking sequence and Kevlar incorporation. Five laminate configurations—pure kenaf (KF), pure Kevlar (KV) and three hybrids (KVA, KVB, KVC)—were fabricated through hand layup and vacuum bagging and tested using a Split Hopkinson Pressure Bar (SHPB) at 1.2, 1.4, and 1.6 bar. KF exhibited the highest strain rate sensitivity confirming its ability to strengthen under elevated strain rates. KV, despite high tensile strength of Kevlar fiber showed lowest compressive strength (26.90–34.23 MPa) and limited ductility. Among the hybrids, KVB demonstrated the best performance achieving maximum stress of 46.94 MPa at 1.6 bar and 144–289% increase in ductility compared with KV attributed to effective load confinement by the Kevlar outer layers and progressive crushing of the kenaf inner layer. KVA remained consistently weaker than KVB, underscoring the importance of Kevlar placement while KVC demonstrated 35% lower strength and 26–61% less ductile than KF but stronger and more ductile than KV. These findings confirm that stacking sequence influences hybrid composite response under high strain rate loading providing insights for developing lightweight, impact-resistant natural-synthetic hybrid composites.