SIM-AM 2023

Mechanics and modelling of additively manufactured layered photopolymerized polymers

  • Brighenti, Roberto (Univ. of Parma)
  • Cosma, Mattia (Univ. of Parma)

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Additive manufacturing of materials based on the photopolymerization process [1], offers a wide range of possibilities for obtaining small-scale and geometrically precise elements, whose physical and mechanical properties can be tuned at will by controlling the 3D printing process [1]. In this study, we consider the multi-physics problem of the photopolymerization process performed in subsequent layers, by considering the modelling of light diffusion, the chemical kinetics of the monomer-polymer conversion, as well as the mechanics of the obtained material [2]. A moving light source is assumed to trigger the polymerization reaction solved by accounting for the variable absorbance of the material being solidified and for the previously printed layers. Parametric analyses are performed to underline the role of the light exposure time and of the layer pattern on the mechanical properties of the obtained part. Considerations on the energy required by the AM process and its relationship with the final properties of the printed element are also made. As an example, in Fig. 1 the dimensionless shear modulus obtained by photopolymerizing the material domain with a different number of layers, for the same overall light exposure time, is illustrated. We demonstrate how the material properties and their distribution can be precisely tuned by leveraging the printing parameters. REFERENCES [1] J. Wu, Z. Zhao, C.M. Hamel, et al. Evolution of material properties during free radical photopolymerization. J. Mech. Phys. Sol. (2018) 112: 25–49. [2] R. Brighenti, M.P. Cosma. Mechanical behavior of photopolymerized materials. J. Mech. Phys. Sol. (2021) 153: 104456.