<![CDATA[Fused Deposition Modeling (FDM) technology plays a significant role in fabricating the core of sandwich composite structures due to its capability to manufacture complex geometries with various infill patterns, enabling the optimization of lightweight and high-strength structures. This study aims to investigate the influence of infill pattern variations on the tensile properties of sandwich composites composed of a PLA core and carbon fiber skins using the hand lay-up method. The infill patterns employed include cubic, gyroid, grid, and honeycomb, each with an infill density of 20%. Specimens were fabricated and assembled according to ASTM D3039 standards, followed by tensile testing to evaluate ultimate tensile strength, elastic modulus, and fracture behavior. The results indicate that the honeycomb pattern achieved the highest tensile strength of 49.85 MPa and stiffness of 1045 MPa, followed by grid (47.44 MPa; 1033 MPa), gyroid (44.75 MPa; 946 MPa), and cubic (43.46 MPa; 945 MPa), establishing honeycomb as the most optimal infill pattern for enhancing mechanical performance.]]>
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