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Structure Control in Fiber Reinforced Polymer Composites in Additive Manufacturing Technologies

Prusinowski A., Kaczyński R.

Machine Dynamics Research

2018

Vol. 42, No. 3

17--25

The main reason for the authors to discuss the subject is the need to ﬁll the gaps in the knowledge regarding the abrasive wear of polymer composites with reinforcement in the form of short carbon ﬁbers that can be used in additive manufacturing technologies. The illustrated design of the extrusion head makes it possible to obtain a composite with a matrix in the form of a thermoplastic and reinforcement as carbon ﬁbers evenly spaced along the extrusion axis. The results of the simulation of heat propagation in the extrusion head and the ﬂow of the matrix material in the nozzle are shown. This paper presents the research on the mixing process of the matrix material in the designed system and describes further planned tests. The output materials were obtained at various amounts of the PLA matrix material fed in at both entrances to the extrusion head. Mixing of materials has been shown by obtaining different colors of the outgoing material using two different colors of one type of input material.

Simulation of processes occurring in the extrusion head used in additive manufacturing technology

Prusinowski A., Kaczyński R.

Acta Mechanica et Automatica

2017

Vol. 11, no. 4

317--321

The purpose of this research is unsatisfactory state of knowledge of the abrasive wear of composites with thermoplastic polymer as matrix material and reinforcing material in the form of short and focused carbon fibers that can be used in additive manufacturing technologies. The paper presents a conceptual design of an extrusion head used in Fused Deposition Technology, which allows for the implementation of appropriately stacked fibers at the level of detail production. Finite element simulation was performed to simulate the thermal effect of the system to demonstrate the effect of head cooling on the system. The assumed extrusion temperature of the material was obtained at a uniform nozzle temperature and stable temperature of the entire system. Flow simulation of thermoplastic polymer was carried out in the designed extrusion nozzle. By supplying 0.5 mm wire of 1.75 mm diameter thermoplastic material to the nozzle, the extrusion rate was 0.192 m/s. The proper design of the extrusion head for the intended applications has been demonstrated and the purpose of further research in this field has been confirmed.