Issue 73

H. Taoufik et alii, Fracture and Structural Integrity, 73 (2025) 236-255; DOI: 10.3221/IGF-ESIS.73.16

Figure 7: Impact of filament orientation on tensile strength and strain in 3D Printed PLA Samples.

R ESULT AND DISCUSSION

Statistical analysis of 3D printed samples he curves presented in Fig. 7 show distinct stress and strain behaviors. The 0° orientation curves (colored and non colored) reach the highest stress levels before dropping sharply, indicating the greatest tensile strength. This aligns with the fact that infill lines aligned with the loading direction contribute to better mechanical performance. Conversely, the 90° orientation curves (colored and non-colored) show the lowest stress levels throughout the strain, indicating the lowest tensile strength. This is because the infill lines are perpendicular to the loading direction, offering minimal resistance to the pulling force. 45° and 90° orientations: In contrast, when the infill lines are at 45° or 90° orientations, they are not directly aligned with the pulling force. It is like trying to support the same object by placing it at an angle on the pillars. The angled orientation makes it easier for the object to slide off or for the pillars to break, leading to lower overall strength. T

Figure 8: Weibull distribution analysis of tensile strength at different orientations (a): 90°, (b): 45°, and (c): 0°.

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