Effect of cell shape and mass reduction on the impact strength of cellular 3D-printed parts

Articles in Press

Document Type : Research Paper

Authors

1 Mechanical Engineering Department, Engineering Faculty, Ayatollah Boroujerdi University, Boroujerd, Iran

2 Department of Mechanical Engineering, Arak University of Technology, Arak, Iran

3 Shahrekord University

Abstract

The manufacturing industry is facing a growing concern for environmental regulations and a demand for strong and lightweight materials. The use of brittle materials such as PLA can lead to higher costs due to their inefficiency and short lifespan. A common methods for improving the mechanical properties of polymer materials is through creating porosity, nano reinforcement or using cellular structures. This research aims to enhance the impact strength of 3D-printed parts made of PLA by altering their structure through the examination of various cell shapes, including circular, decagonal, octagonal, hexagonal, and square shapes, for mass reductions of 23, 36, and 43%. Charpy impact test was employed to investigate the design specimen’s impact strengths. Results showed that the cell shapes with few corners and no corners reasonably allow the formation of plastic hinges and improve the sample impact strength. Results demonstrated that the absorbed energy increases by 30-60% on average by creating a cellular structure. In addition, investigations showed that the impact strength of Sq43, Ci43, and He43 improved by 111%, 92%, and 44%, respectively, compared to cell-free 3D-printed PLA.

Keywords

Journal of Nanostructures

Articles in Press, Accepted Manuscript
Available Online from 20 August 2024

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