Multi-property cellular material design approach based on the mechanical behaviour analysis of the reinforced lattice structure

• Main Authors: X. Ren, L. Xiao, Z. Hao
• Format: Article
• Language: English
• Published: Elsevier 2019-07-01
• Series: Materials & Design
• Online Access: http://www.sciencedirect.com/science/article/pii/S0264127519302229

Lattice structures have advantages such as energy absorption and heat transfer; however, they can often suffer failure because of stress distribution and lack of stiffness. A spherical-node-body-centred-cubic (SNBCC) structure was developed to reduce the stress concentration and improve the stiffness. The relative density, surface area, and equivalent modulus of the SNBCC structure were studied, and a method to select suitable parameters was developed. The results showed that the prediction errors of the theoretical relative density and surface area were both <1.00% compared with that of the CAD model. The theoretical modulus's prediction error was approximately 10.00% compared with that of the finite element analysis. Compared with the BCC structure, the relative density of the SNBCC structure only increased from 1.00% to 7.00%, the stress concentration reduced from 10.00% to 30.00%, and the stiffness increased from 5.00% to 58.10%, when the ratio of the strut diameter to the unit cell length was within 0.02–0.10. The projection approach for the lattice structure's multi-property design was applied. If a solid material's modulus is 200.00 GPa, the design range of the relative density and the equivalent modulus can be within 0.0021–0.1197 and 0.10 MPa–1.00 GPa respectively. Keywords: Lattice structure, Mechanical property, Stress concentration, Multi-property design