Development of constitutive material model of 3D printed structure via FDM

The present paper develops the constitutive material models of the 3D printed parts via fused deposition modeling. Additive manufacturing of a part results in a complex microstructure which depends on the process parameters and build orientation. Consequently, anisotropy is introduced into the material properties. The mechanical behavior of the printed parts is governed by the constitutive behavior of the material. Therefore, the stiffness matrix of the material of the final printed part needs to be estimated for accurately capturing their behavior. The constitutive material modeling of the printed parts using numerical homogenization procedure is emphasized in this work. The present simulation models can capture the influence of build orientation, printing direction and layer thickness on the material behavior of the printed parts. Then, the influence of layer deposition in printing of differently oriented parts of the structure on the material behavior is investigated. It is revealed that the material behavior of different parts of the structure is not same and is dependent on the build orientation of the parts and also their thickness. This work aids the computation of elastic moduli and also selecting of the correct constitutive material model of the printed parts for stress analysis.