PSI - Issue 56

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Estera Vălean et al. / Structural Integrity Procedia 00 (2023) 000 – 000

Estera Vălean et al. / Procedia Structural Integrity 56 (2024) 58 – 64

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Fig. 4. a) SED vs.

trend with critical SED value as determined from smooth specimens and b) SED summary for PLA specimens with

experimental and predicted fracture load; c) SED vs.

trend with critical SED value as determined from smooth specimens.

5. Conclusions In this work the behavior of PLA and PLA-CF specimens realized through FDM process and weakened by V notches has been investigated in mode I loadings condition while changing the notch opening angle through the use of SED method. The critical SED value, considered for the application of the method, have been evaluated through the true strain – true stress curve; the ductile behavior shown by both materials required for the consideration of an equivalent elastic material for a consistent application of the method. It has been shown that, considering an equivalent elastic material, the method is able to predict the expected fracture load with an average error of ±7% considering both sets of specimens; besides, in agreement with the experimental results, the method predicts a minimum of the critical load to failure for 60°. Acknowledgements The project leading to these results has received funding from the European Union’s Horizon 2 2 research and innovation program 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. Berto, F., Lazzarin, P., 2014. Recent developments in brittle and quasi-brittle failure assessment of engineering materials by means of local approaches, Mater. Sci. Eng. R Reports, 75(1), 1-48. Durga, V., Rajiv, P., Navya Geethika, V., 2019. Effect of Fused Deposition Modelling (FDM) Process Parameters on tensile Strength of Car-bon Fibre PLA, Materials Today: Proceedings 18, 2012-2018. Farah, S., Anderson, D.G., Langer, R., 2016. Physical and mechanical properties of PLA, and their functions in widespread applications – a comparative review. Advanced Drug Delivery Reviews 107, 367-392. García Plaza, E., López, P.J.N., Torija, M.Á.C., Muñoz, J.M.C., 2019. Analysis of PLA geometric properties processed by FFF additive manufacturing: Effects of process parameters and plate-extruder precision motion. Polymers, 11, 1581. Foti, P., Berto F., 2020. Evaluation of the Effect of the TIG-Dressing Technique on Welded Joints through the Strain Energy Density Method, Procedia Structural Integrity, 25, 201-208.