Effect of Infill Parameters on the Compressive Strength of 3D-Printed Nylon-Based Material

• Main Authors: Liu J., Naeem M.A., Al Kouzbary M., Al Kouzbary H., Shasmin H.N., Arifin N., Abd Razak N.A., Abu Osman N.A.
• Other Authors: 57223432161
• Format: Article
• Published: MDPI 2024
• Subjects: 3D print; carbon fiber-reinforced nylon; compressive strength; FDM; infill density; infill pattern; powered ankle-foot prosthesis; 3D printers; Compression testing; Infill drilling; Polyamides; Prosthetics; Rayon; Reinforcement; 3-D printing; 3d prints; 3D-printing; Carbon fiber reinforced; Carbon fiber-reinforced nylon; Infill density; Infill pattern; Powered ankle-foot prosthesis; Reinforced nylons; Standard specimens; Compressive strength

3D printing is the most suitable method to manufacture the frame parts of powered ankle-foot prostheses but the compressive strength of the 3D-printed part needs to be ensured. According to the compression test standard ASTM D695, the effect of infill pattern and density, which is transferred to the mass of the standard specimen, on the compressive strength is investigated with a carbon fiber-reinforced nylon material. With the same infill pattern, specimens with more mass have a higher compressive strength. With the same mass, specimens with triangular fill have a higher compressive strength than those with rectangular and gyroid fills. Compared with specimens with a solid fill, specimens with a triangular fill can also provide more compressive strength in a unit mass. According to the results of standard specimens, following the requirement of strength and lightweight, 41% triangular fill is selected to manufacture the supporting part of a powered ankle-foot prosthesis. Under a compressive load of 1225 N, the strain of the assembly of the standard adaptor and the 3D-printed part is 1.32 � 0.04%, which can meet the requirement of the design. This study can provide evidence for other 3D-printed applications with the requirement of compressive strength. � 2023 by the authors.