Study on 3D Printing of Continuous Carbon Fiber Reinforced Nylon Composite Materials
Continuous carbon fiber reinforced composite materials have advantages such as high strength,rigidity,wear resistance,high temperature resistance and lightweight,making them suitable for fields that require high performances and lightweight.The use of 3D printing technology in the preparation of continuous carbon-fiber-reinforced composite materials has advantages such as higher efficiency,lower cost,high material utilization and flexible productions.The researches of 3D printing of continuous carbon fiber reinforced nylon composite materials were conducted,including the effects of extrusion width,layer thickness and printing temperature on the tensile properties and bending properties of printed materials.The influences of annealing treatment on the mechanical properties of the materials were also explored.The cutting cross-section and the cross-section resulted from tensile fracture failure of 3D-printed samples were observed by scanning electron microscopy(SEM).The relationships between the internal structures and mechanical properties of printed samples and post-treated printed samples were analyzed with different process parameter conditions.The results show that when the extrusion width is 0.65 mm,the mechanical properties of the printed samples are optimal.Its tensile strength and tensile modulus are respectively 501.51 MPa and 31.70 GPa,bending strength and bending modulus are respectively 164.53 MPa and 31.91 GPa.When the layer thickness is 0.1 mm,the mechanical properties of the printed sample are optimal,whose tensile strength and tensile modulus are respectively 520.78 MPa and 36.59 GPa,bending strength and bending modulus are respectively 168.43 MPa and 32.31 GPa.Subsequently,the mechanical properties decrease with the increasing of layer thickness.The effects of printing temperature on the mechanical properties of printed samples are relatively small.The post-annealing treatment has a certain optimization effect on the mechanical properties of printed samples,with an increase of tensile strength by3.07%and an increase of bending strength by51.27%.
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