PSI - Issue 53

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Reza Ahmadi et al. / Procedia Structural Integrity 53 (2024) 97–111 Author name / Structural Integrity Procedia 00 (2019) 000–000

In our thermography analysis, we observed some slight variations in stress results, particularly in notched specimens, as illustrated in the accompanying graphs. However, to account for these variations, we considered the average damage stress values, which were measured at 22.2 MPa and 19.4 MPa for specimens with one hole and two holes, respectively. Remarkably, our simulation results were found to be in strong agreement with the average stress values obtained from experimental tests, which were 23.33 MPa and 21.4 MPa for specimens with one hole and two holes (Figure17,18). This close alignment between the simulation and experimental data supports the precision of our material definition within the simulation, demonstrating its effectiveness in accurately modeling the behavior of the 3D printed PLA composite material under consideration. Indeed, the lower damage stress observed in thermography and stress analysis in ACP(Post) for specimens with two holes can be linked to stress distribution within the material. This suggests that the presence of multiple holes in the specimen may lead to a more even distribution of stress, resulting in lower damage stress levels. The interaction between the structural configuration of the specimen and the distribution of loads within it can have a significant impact on stress levels. In cases where a specimen has multiple holes, the load-bearing areas between the holes may be more evenly distributed, reducing stress concentrations, and lowering the potential for damage or failure. This phenomenon is consistent with the observation that the outer layers of the 3D printed PLA composite exhibited higher stress levels, as they are more likely to bear the primary load. Understanding how the specimen's geometry and the distribution of features impact stress distribution is critical for optimizing the design of 3D printed components and ensuring their structural integrity. These findings underscore the importance of considering the configuration and features of the specimen in stress analysis and design optimization.

Figure 17. Stress distribution in ACP (Post) analysis for notches specimen with one hole

Figure 18.Stress distribution in ACP (Post) analysis for notches specimen with two holes