Mechanic of Advanced and Smart Materials
Quarterly

Investigations of the Mechanical Properties of DLP 3D Printed Graphene/Poly-Amide Composites in different printing directions

Document Type : Original Article

Authors

Mohammad Velashjerdi 1
Meysam Soleymani 2
yasman moghadas zadeh 1

1 Department of Material science and Engineering, Arak University, Arak

2 Chem, Eng. Dept. Arak University Arak Iran

https://doi.org/10.61186/masm.4.2.189
Abstract
In this research, the effect of adding different percentages of graphene oxide to polyamide and the effect of different printing directions on the mechanical properties of 3D printed samples were investigated. At first, 0.3% and 0.7% of graphene oxide nanoparticles were mixed in the matrix. Pure and composite polymer samples with different percentages of graphene oxide were printed by stereolithography in three directions. The mechanical properties of the samples were evaluated using tensile, impact and hardness tests. A scanning electron microscope was used to check the fracture surfaces of the samples. The results of the mechanical properties tests indicate a decrease in strength with the addition of go nanoparticles. With the increase of graphene oxide nanoparticles, the strength of the parts decreased by 30%. On the other hand, there was a 12% difference in tensile strength in pure polymer samples, which reached 17% with the addition of nanoparticles. Microscopic investigations showed the formation of clusters of graphene oxide nanoparticles in the composite samples, which led to stress concentration and cracking. Based on this, the printing direction has a significant effect on the mechanical properties of the printed samples. Among the pure polymer samples, the sample printed in the flat direction and among the composite samples, the nanocomposites printed in the vertical direction showed the best mechanical properties. Adding graphene oxide nanoparticles to the resin and increasing the percentage of nanoparticles in the direction of printing on the edge led to a decrease in hardness compared to the pure polymer sample.

Keywords

digital light proccesing
graphene oxide
mechanical properties
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Mechanic of Advanced and Smart Materials
Volume 4, Issue 2
Summer 2024
Pages 189-206

  • Receive Date 14 April 2024
  • Revise Date 22 April 2024
  • Accept Date 30 April 2024

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