Phase-field fracture coupled elasto-plastic constitutive model for 3D printed thermoplastics and composites

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Department of Mechanical Engineering-Engineering Mechanics


Understanding the mechanical behavior and failure of 3D printed components is vital for their application. Recently, many experimental studies have demonstrated that the fracture in these types of materials depends on the printing parameters. This study aims to develop numerical models for predicting the constitutive behavior and fracture of 3D printed thermoplastics and 3D printed short fiber reinforced composites. A small-strain elasto-plastic anisotropic phase field fracture approach has been proposed for a class of 3D printed thermoplastics; further a finite strain elasto-plastic cohesive zone based phase field model has been proposed to model the fracture in 3D printed short fiber reinforced composites. Experiments are also performed in 3D printed thermoplastic parts to investigate the fracture mechanisms in detail. It is observed that the fracture pattern varies with the printing orientations for the thermoplastics as well as for the composites. Hence the printing orientation influences the peak load and the fracture toughness of the printed parts. The proposed model predictions have been validated against the experimental data for both the 3D printed thermoplastics and composites.

Publication Title

Engineering Fracture Mechanics