Experimental validation of theoretical models for hypercube models made by fused deposition modelling technology

• DOI: 10.1007/s12206-019-1140-1
• Publication Date: 2019-12-31T14:02:28Z
• Authors: Jeongho Choi; Sang-ik Lee
• Keywords: Tension (geology)

This paper aims to define theoretical model for sandwich core models such as core-fill and core-space models. These models are made of a polymer with an additive manufacturing capability using fused deposition modelling (FDM). Based on an American Society for Testing and Materials (ASTM) standard, the model runs either tension or compression using a laser extensometer to measure displacement. With tension, the model collects the following mechanical properties: 2.58 GPa for the elastic modulus, Es; 34.90 MPa for the compressive yield strength, σys; and 39 MPa for the compressive ultimate strength, σultimate. With compression, the model collects the following mechanical properties of a core-fill model: 0.0043 GPa for the elastic modulus, E* core-fill; 0.035 MPa for the yield strength, σys_core-fi;l, and 0.257 MPa for the ultimate strength, σ*ultimate_core-fill. The mechanical properties of the core-space model are 0.00407 GPa for the elastic modulus, E*core-space; 0.027 MPa for the yield strength, σ*ys_core-space; and 0.093 MPa for the ultimate strength, σ*ultimate_core-space. Finally, each model defined the correlation between either the relative density and the relative elastic modulus or the relative density and the relative compressive yield strength. In the near future, we hope to develop a lightweight structure for applications in the aero-space industry.