3D打印连续纤维增强聚酰胺复合材料机械性能研究

Mechanical properties of 3D printing continuous fiberreinforced polyamide composites

采用3D打印增材制造(ALM)工艺制造连续纤维增强聚酰胺复合材料零件。利用扫描电镜来观察复合材料制成的3D打印单丝的显微照片,利用拉伸、压缩性能测试评估复合材料的力学性能。结果表明,纤维的表面处理导致硅烷偶联剂与玻璃纤维表面有化学反应发生;3D打印玻璃纤维表面附着大量聚酰胺材料,并结合良好。试样沿纤维方向的拉伸曲线应力随应变呈线性变化,直到断裂,在应力达到550 MPa时,试样发生断裂,拉伸应变为4.23%;而在垂直于纤维方向上,断裂强度可以达到10.56 MPa,试样发生断裂时,拉伸应变为1.32%。复合材料沿纤维方向上的压缩断裂强度可达86.82 MPa,试样发生断裂时,压缩应变为0.62%;而在垂直于纤维方向上,压缩断裂强度可达13.95 MPa,试样发生断裂时,压缩应变为1.22%。

Continuous fiber reinforced polyamide composite parts were manufactured by 3D printing additive manufacturing(ALM).Scanning electron microscope(SEM)was used to observe the microphotographs of 3D printing single filaments made of composite materials,and tensile and compression performance tests were used to evaluate the mechanical properties of composite materials.The results showed that the surface treatment of the fiber results in chemical reaction between the silane coupling agent and the glass fiber surface.The surface of 3D printing glass fiber was attached with a large number of polyamide materials,and the combination was good.The tensile curves along the fiber direction of the sample changed linearly with strain until it broke.When the stress reached 550 MPa,the sample broke and the tensile strain was 4.23%.In the direction perpendicular to the fiber,the breaking strength could reach 10.56 MPa,and the tensile strain was 1.32%when the sample broke.The compressive fracture strength of the composite along the fiber direction could reach 86.82 MPa,and the compressive strain was 0.62%when the sample broke.In the direction perpendicular to the fiber,the compressive fracture strength could reach 13.95 MPa,and the compressive strain was 1.22%when the sample broke.