PSI - Issue 51

M. Vaško et al. / Procedia Structural Integrity 51 (2023) 173–178 M. Vaško et al. / Structural Integrity Procedia 00 (2022) 000–000

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Fig. 5. The notch in the reinforcing layers.

Delamination was observed similarly as in the case of direct loading (Fig. 6a). In some cases, failure occurred transverse to the layering instead of delamination, i.e. the failure occurred between the filaments of individual laminas (Fig. 6b). This failure is possible due to the fibre arrangement where there is a lack of reinforcement around the circumference of the specimen.

(a)

(b)

Fig. 6. Perpendicular loading: (a) delamination of the specimen; (b) crack propagation between the filaments of a given lamina.

4. Conclusion The primary aim was to identify the effect of a notch on the impact toughness on one of the print setting variations. The results showed that in the case of specimens with laminas oriented perpendicular to the direction of the loading, the notch influence was observed since the impact toughness decreased considerably. On the other hand, the notched specimens showed higher toughness under direct loading. What is interesting is the different failure mechanism of the specimens, which will need to be analysed more closely. A similar assessment will be performed in the case of specimens reinforced with continuous fibre deposited in concentric rings and specimens reinforced with chopped carbon fibre in the future. The goal will be to analyse the impact of the notch not only on the impact toughness, but also on the failure mode of the specimens (whether the notch initiates the crack and how the crack propagates). Acknowledgements This work has been supported by KEGA 054ŽU-4/2021. References Barbero, J.E., 2017. Introduction to Composite Materials Design. 3 rd edition; CRC Press: Boca Raton, USA, p. 366. Caminero, M.A., Chacón, J.M., García-Moreno, I., Rodríguez, G.P., 2018. Impact damage resistance of 3D printed continuous fibre reinforced thermoplastic composites using fused deposition modelling. Composites Part B 148, 93-103. Chua, C.K., Leong, K.F., Lim, C.S., 2010. Rapid Prototyping: Principles and Applications, 3rd edition. World Scientific Publishing Com., Singapore, p. 512. Goh, G.D., Yap, Y.L., Agarwala, S., Yeong, W.Y., 2019. Recent progress in additive manufacturing of fiber reinforced polymer composite. Adv. Mater. Technol. 4, 1-22. Jones, R.M., 1999. Mechanics of Composite Materials, 2nd edition. Taylor & Francis Group, New York, pp. 538.