Iranian Journal of Mechanical Engineering Transactions of the ISME

Iranian Journal of Mechanical Engineering Transactions of the ISME

Experimental Investigation of Injection Pattern Effect on Tensile Strength of PLA Material in FDM Processes

Document Type : Research Paper

Authors
Farid Gholipour 1
Mohammad Reza Shabgard 2
Mohammad Baraheni 3
1 M.Sc., Manufacturing Group, Faculty of Mechanic, Tabriz University, Tabriz, Iran
2 Professor, Manufacturing Group, Faculty of Mechanic, Tabriz University, Tabriz, Iran
3 Assistant Professor, Manufacturing Group, Faculty of Mechanic, Arak University of Technology, Arak, Iran
10.30506/jmee.2024.2037896.1354
Abstract
Fused deposition modeling (FDM) is the most popular, simplest, and least expensive method of additive manufacturing and 3D printing. This technique, based on extruding molten thermoplastic filament, is favored across industries for rapid prototyping and creating complex geometries without molds or extra equipment. A key challenge in FDM is the significant impact of printing parameters on the mechanical and physical properties of the final product. This research aims to examine how basic printing parameters, specifically using a 0.4 mm nozzle diameter in two injection mold patterns (linear and concentric), affect tensile strength. Results showed that altering the injection pattern changes tensile strength, ranging from 28.1 MPa to 27.8 MPa at 190℃. The linear pattern achieved the highest tensile strength, while the concentric pattern had the lowest. Additionally, scanning electron microscope images of the fracture surfaces revealed that all samples had micro holes at the layer interfaces, a characteristic inherent to the FDM process.
Keywords
Additive manufacturing
3D printing
Injection pattern
Tensile strength

Subjects

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Iranian Journal of Mechanical Engineering Transactions of the ISME
Volume 26, Issue 2 - Serial Number 45
September 2025
Pages 51-71