<![CDATA[This study examines the mechanical properties of oil palm trunk fiber (OPTF) composites to assess their potential application in crash box structures as sustainable and lightweight materials. Oil palm trunk waste, abundantly available in South Kalimantan, was utilized as natural fiber reinforcement in epoxy composites. Specimens were fabricated with fiber orientations of 30°, 60°, and 90°, and tested for tensile and impact properties according to ASTM D638-02 and ASTM D6110 standards. The results showed that fiber orientation significantly influenced mechanical behavior. The 60° orientation exhibited the highest tensile strength and stiffness, while the 30° orientation had the greatest elongation, indicating better ductility. The 90° orientation showed moderate strength but brittle characteristics. Impact testing revealed that the 60° orientation absorbed the most impact energy, achieving the best balance between strength and toughness. Therefore, oil palm trunk fiber composites with 60° or hybrid 30°/60° orientations are considered mechanically feasible for potential crash box applications, combining adequate energy absorption capacity, lightweight advantages, and environmental sustainability.]]>
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