Iranian Journal of Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Experimental investigation of printing parameters' effect on the inter-raster strength in a single layer of polylactic acid material printed by fused deposition modeling process

Document Type : Original Article

Authors
Maryam Abolizadeh 1
Nasrin Aminizadeh 2
Amin Safi Jahanshahi 2
Behnam Akhoundi 2
1 MSc Student, Faculty of Mechanical Engineering, Sirjan University of Technology, Kerman, Iran
2 Assistatnt Professor, Faculty of Mechanical Engineering, Sirjan University of Technology, Kerman, Iran
10.22034/ijme.2024.468611.1986
Abstract
The fused deposition modeling process is one of the most widely used additive manufacturing methods. In this process, each layer is formed by placing rasters next to each other. By increasing the strength of the connection between the rasters and the layers, the mechanical properties of the printed part can be increased. Therefore, in this research, at first, the relationship between the temperature of the deposited raster and the printing parameters is theoretically determined. This causes the identification and effect of each parameter on the amount of temperature drop in the deposited raster. Then the effect of printing parameters, including nozzle temperature, extrusion width, layer height, printing speed, and filling pattern, on the tensile strength of a single layer is investigated to determine the inter-raster strength. The theoretical results show that when the nozzle temperature is 210°C, the extrusion width is 0.8 mm, the layer height is 0.3 mm, and the printing speed is 80 mm/s, the minimum temperature drop of 38% from 210 to 152 °C occurs in the deposited raster. Also, the parameters of layer height, printing speed, nozzle temperature, and extrusion width have the greatest effect on temperature drop respectively. The maximum temperature drop is 303% from 210 to 52 °C. Also, the variance analysis of the results of the tensile test shows that the effect of the parameters of the filling pattern, printing speed, extrusion width, layer height, and nozzle temperature are 82.05, 6.41, 5.86, 2.84 and 2.84%, respectively. The maximum tensile strength is 72 MPa for the sample where the nozzle temperature, extrusion width, layer height, printing speed, and filling pattern are equal to 210°C, 0.8 mm, 0.3 mm, 80 mm/s, and zigzag, respectively. The maximum increase in tensile strength in all samples is 109%, from 34.5 to 72 MPa. Also, in the samples in which the maximum inter-raster strength has been created, the necking phenomena occur, and inter-raster separation is not seen in the samples.
Keywords
3D Printing
Inter-Raster Strength
Additive Manufacturing
Mechanical Properties
Thermal Analysis
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