This paper focused on the investigation of mechanical, twist drilling performance and microstructural analysis in aluminum foil reinforced sisal flax epoxy composite. Six combinations of composite (SF1–SF6) were fabricated by hand layup method with two different orientation of circular (φ = 5 mm) geometrical patterns in aluminum foil (thickness 0.024 mm) as structural reinforcement. The mechanical properties were determined by the tensile, flexural, impact, and hardness investigation with ASTM test specimens. The machinability of the composites was studied through twist drilling operation (8 mm), and the drilling experiments were designed by the design expert 11.0. The analysis was performed on a CNC milling machine (VF-30 CNC VS) vertical milling center with the different process parameters like spindle speed (500–2000 r/min), feed rate (0.05–0.25 mm/min), and hole pitch (20, 40, and 60 mm) in sliding dry environments at room temperature. The fractured composite samples were examined through a scanning electron microscope to determine the fiber pullout, deboning, and voids between the reinforcement and matrix. The obtained results were shown that the sample with 45° staggered hole with 60 mm hole pitch (SF6) composite holds the excellent mechanical properties like tensile strength (31 MPa), flexural strength (76 MPa), impact strength (1.5 J), and hardness value (23 VHN) compared to other combinations. The effect of hole pitch and spindle speed significantly affects the circularity error.

中文翻译：

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嵌入穿孔铝箔的亚麻剑麻混合复合材料钻孔及力学性能分析

本文重点研究了铝箔增强剑麻环氧树脂复合材料的机械性能、麻花钻孔性能和微观结构分析。复合材料（SF1-SF6）的六种组合通过手糊法制造，在铝箔（厚度 0.024 mm）中具有两种不同方向的圆形（φ = 5 mm）几何图案作为结构增强材料。机械性能是通过拉伸、弯曲、冲击和硬度研究用 ASTM 试样确定的。通过麻花钻操作（8 mm）研究复合材料的可加工性，钻孔实验由设计专家11.0设计。分析是在数控铣床 (VF-30 CNC VS) 立式铣削中心上进行的，具有不同的工艺参数，如主轴转速 (500-2000 r/min)、进给速率 (0.05-0. 25 毫米/分钟）和孔间距（20、40 和 60 毫米）在室温滑动干燥环境中。通过扫描电子显微镜检查断裂的复合材料样品，以确定纤维拉出、脱骨以及增强材料和基体之间的空隙。所得结果表明，具有 60 mm 孔距 (SF6) 复合材料的 45° 交错孔样品具有优异的机械性能，如拉伸强度 (31 MPa)、弯曲强度 (76 MPa)、冲击强度 (1.5 J) 和与其他组合相比的硬度值 (23 VHN)。孔距和主轴转速的影响显着影响圆度误差。通过扫描电子显微镜检查断裂的复合材料样品，以确定纤维拉出、脱骨以及增强材料和基体之间的空隙。所得结果表明，具有 60 mm 孔距 (SF6) 复合材料的 45° 交错孔样品具有优异的机械性能，如拉伸强度 (31 MPa)、弯曲强度 (76 MPa)、冲击强度 (1.5 J) 和与其他组合相比的硬度值 (23 VHN)。孔距和主轴转速的影响显着影响圆度误差。通过扫描电子显微镜检查断裂的复合材料样品，以确定纤维拉出、脱骨以及增强材料和基体之间的空隙。所得结果表明，具有 60 mm 孔距 (SF6) 复合材料的 45° 交错孔样品具有优异的机械性能，如拉伸强度 (31 MPa)、弯曲强度 (76 MPa)、冲击强度 (1.5 J) 和与其他组合相比的硬度值 (23 VHN)。孔距和主轴转速的影响显着影响圆度误差。和硬度值 (23 VHN) 与其他组合相比。孔距和主轴转速的影响显着影响圆度误差。和硬度值 (23 VHN) 与其他组合相比。孔距和主轴转速的影响显着影响圆度误差。