Indentation experiments and simulations of nonuniformly photocrosslinked polymers in 3D printed structures

Zeang Zhao; Dong Wu; Hao Sen Chen; H. Jerry Qi; Daining Fang

doi:10.1016/j.addma.2020.101420

Indentation experiments and simulations of nonuniformly photocrosslinked polymers in 3D printed structures

Zeang Zhao, Dong Wu, Hao Sen Chen, H. Jerry Qi^*, Daining Fang^*

^*Corresponding author for this work

Institute of Advanced Structure Technology

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

In this paper, the microscale mechanical properties of 3D printed multi-layered polymeric structure were investigated by indentation experiments. The indentation modulus appears to be periodically varied inside the multi-layered structure and the overall stiffness of a structure was highly dependent on its printing condition. To elucidate the evolution of the nonuniform mechanical properties, we develop a thermodynamically consistent model which coupled the photopolymerization kinetics together with the reaction-dependent viscoelastic deformation. A correlation between the periodic mechanical properties and the stepwise photopolymerization 3D processing is investigated through the finite element simulations using the theoretical model. Suggestions on how to increase the printing speed of a structure without undermining its mechanical performance are provided.

Original language	English
Article number	101420
Journal	Additive Manufacturing
Volume	35
DOIs	https://doi.org/10.1016/j.addma.2020.101420
Publication status	Published - Oct 2020

Keywords

Digital light processing
Finite element simulation
Indentation
Polymer 3D printing

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10.1016/j.addma.2020.101420

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abstract = "In this paper, the microscale mechanical properties of 3D printed multi-layered polymeric structure were investigated by indentation experiments. The indentation modulus appears to be periodically varied inside the multi-layered structure and the overall stiffness of a structure was highly dependent on its printing condition. To elucidate the evolution of the nonuniform mechanical properties, we develop a thermodynamically consistent model which coupled the photopolymerization kinetics together with the reaction-dependent viscoelastic deformation. A correlation between the periodic mechanical properties and the stepwise photopolymerization 3D processing is investigated through the finite element simulations using the theoretical model. Suggestions on how to increase the printing speed of a structure without undermining its mechanical performance are provided.",

keywords = "Digital light processing, Finite element simulation, Indentation, Polymer 3D printing",

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AU - Fang, Daining

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N2 - In this paper, the microscale mechanical properties of 3D printed multi-layered polymeric structure were investigated by indentation experiments. The indentation modulus appears to be periodically varied inside the multi-layered structure and the overall stiffness of a structure was highly dependent on its printing condition. To elucidate the evolution of the nonuniform mechanical properties, we develop a thermodynamically consistent model which coupled the photopolymerization kinetics together with the reaction-dependent viscoelastic deformation. A correlation between the periodic mechanical properties and the stepwise photopolymerization 3D processing is investigated through the finite element simulations using the theoretical model. Suggestions on how to increase the printing speed of a structure without undermining its mechanical performance are provided.

AB - In this paper, the microscale mechanical properties of 3D printed multi-layered polymeric structure were investigated by indentation experiments. The indentation modulus appears to be periodically varied inside the multi-layered structure and the overall stiffness of a structure was highly dependent on its printing condition. To elucidate the evolution of the nonuniform mechanical properties, we develop a thermodynamically consistent model which coupled the photopolymerization kinetics together with the reaction-dependent viscoelastic deformation. A correlation between the periodic mechanical properties and the stepwise photopolymerization 3D processing is investigated through the finite element simulations using the theoretical model. Suggestions on how to increase the printing speed of a structure without undermining its mechanical performance are provided.

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Indentation experiments and simulations of nonuniformly photocrosslinked polymers in 3D printed structures

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