PSI - Issue 68

Estera Vălean et al. / Procedia Structural Integrity 68 (2025) 955 – 961 Vălean et al./ Structural Integrity Procedia 00 (2025) 000–000

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To make a more detailed comparison of the static and dynamic results, a plot showing the total absorption energy for different types of specimens is presented in Figure 5. It can be seen, that under static load, the maximum energy absorption occurs in the PLA-CF smooth material, while under dynamic load, it occurs for PLA specimens.

Fig. 5. Static and dynamic total energy absorption

3. Conclusions The present paper presents the results of an experimental investigation carried out on PLA and PLA-CF specimens (smooth and notch) obtained by additive manufacturing. The following conclusions could be drawn: - the properties of the material reinforced with carbon fibers are much weaker than those of the virgin material, with the exception of the total absorption energy in static loading. - adding the notch decreases the maximum flexural strength for the PLA material by 22%, and for the PLA-CF material by 25%. - The effect of notch on the maximum impact strength for the PLA material is 85% and for PLA-CF material 93%. - in the static load, the maximum energy absorption occurs in the case of PLA-CF smooth material, and for the dynamic load for PLA. Acknowledgements This research has received partially funding from the European Union’s Horizon 2020 research and innovation program (H2020-WIDESPREAD-2018, SIRAMM) under grant agreement No. 857124. References Ajay Kumar, M., Khan, M. S., & Mishra, S. B. (2020). Effect of fused deposition machine parameters on tensile strength of printed carbon fiber reinforced PLA thermoplastics. Materials Today: Proceedings, 27:1505–1510. https://doi.org/10.1016/j.matpr.2020.03.033. Calì, M., Pascoletti, G., Gaeta, M., Milazzo, G., & Ambu, R. (2020). New filaments with natural fillers for FDM 3D printing and their applications in biomedical field. Procedia Manufacturing, 51:698–703. https://doi.org/10.1016/j.promfg.2020.10.098. Foltuţ, D., Vălean, E., Dzitac, V., & Marşavina, L. (2023). The influence of temperature on the mechanical properties of 3D printed and injection molded ABS. Materials Today: Proceedings, 78:210–213. https://doi.org/10.1016/j.matpr.2022.10.039. García Ibarra, V., Sendón, R., & Rodríguez-Bernaldo de Quirós, A. (2016). Antimicrobial Food Packaging Based on Biodegradable Materials. In Antimicrobial Food Packaging: 363–384. https://doi.org/10.1016/B978-0-12-800723-5.00029-2. ISO 178:2019, Plastics — Determination of flexural properties. ISO 179-1, 2023, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test. Ji, Q., Wei, J., YI, J., Zhang, L., Ma, J., & Wang, Z. (2024). Study on the static and dynamic mechanical properties and constitutive models of 3D printed PLA and PLA-Cu materials. Materials Today Communications, 39, 108690. https://doi.org/10.1016/j.mtcomm.2024.108690.