Thermal behaviour of 3D printed part under the influence of nitrogen

Ramli, Mohammad Adib (2021) Thermal behaviour of 3D printed part under the influence of nitrogen. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The present of oxygen during 3D printing process is expected to reduce the quality of 3D printing. The interaction between oxygen and heat during the printing caused bubbling effect on the product surface due to escaping of oxygen. This problem altered the product shape which can reduce the mechanical properties of the materials. Inert gases with lower ambient temperature are used by many industries to replace oxygen during 3D printing process. Therefore, this project was carried out to study how the temperature differences would impact the mechanical properties of the 3D printing materials such as ABS and plastic PC and how can inert gases improve the printing quality thermally. ANSYS 2021 software was used to simulate 3D printing process in an enclosed environment. Different gases condition of oxygen and inert gases of nitrogen and argon were used as the convection for gases environment during the simulation to identify the thermal interaction between A5 dog bone specimen and the heat from both bed sheet and printing nozzle. It was found that the oxygen provides the highest temperature distribution during 3D printing compare to inert gases. Maximum heat flux was obtained in inert gases compared to oxygen environment because of higher temperature difference of the inert gases. The stiffness of both 3D printing materials was proven to increase when printing in inert gases environment compare to the oxygen environment. The stiffness results obtained from the simulation were verified to be precise by the relationship between Young’s Modulus equation with the Linear Thermal Expansion equation where Young’s Modulus is inversely proportional to the temperature difference. Thermically, the inert gases were proven to improve the mechanical properties of the 3D printing materials.

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