Experimental tests were conducted to evaluate the compressive properties (yield strength and compressive modulus) and build time for five different cellular lattice structures fabricated by the Fused Deposition Modeling (FDM) process. The lattice structures had repeating unit cells, and the shapes of the unit cell under study included honeycomb, square, diamond, triangle, and circle. Test specimens were manufactured by a Stratasys Fortus 400mc machine using ABS (Acrylonitrile Butadiene Styrene) as the part material. The five different lattice structures were compared with each other and also with the sparse and sparse-double dense build styles that are directly available from the Fortus machine. Honeycomb structure was found to have the best compression properties for the same porosity, although the differences among the different lattice structures were small ( < 7%). All of these lattice structures were found to have much higher strength than the specimens with the same porosity built using the sparse and sparse-double dense styles. However, the various lattice structures required significantly longer build times than the sparse and sparse-double dense builds. For the honeycomb structure, our investigation also included the effects of porosity and cell size. Higher porosity led to lower compression strength but shorted build time. For the same porosity, the yield strength could be increased and the build time shortened simultaneously by having a certain cell size.
O. Iyibilgin et al., "Experimental Investigation of Different Cellular Lattice Structures Manufactured by Fused Deposition Modeling," Proceedings of the 24th Annual International Solid Freeform Fabrication Symposium (2013, Austin, TX), pp. 895-907, University of Texas at Austin, Aug 2013.
24th Annual International Solid Freeform Fabrication Symposium -- An Additive Manufacturing Conference (2013: Aug. 12-14, Austin, TX)
Mechanical and Aerospace Engineering
Article - Conference proceedings
14 Aug 2013