3D printing and mechanical properties of polyamide products with Schwartz primitive topology

Physical and mechanical properties of cellular structures made of polyamide-12 were studied. The samples represent structural elements, which are repeating in 3 directions and have a geometric form of Schwarz Primitive. Samples have the shape of a cube (the sizes 30 $\times$ 30 $\times$ 30 mm). The technology of layer-by-layer sintering of powder material on SLS (selective laser sintering) 3D printer was used to fabricate the samples. Compression tests of samples with different geometries have shown that with the increase of the characteristic size of repeating structural element the strength of samples grows. With the use of finite element annalists, we have found that this is related to the increase of dangerous section area. The possibility of a substantial increase of specific strength of material while maintaining its density was shown.