PSI - Issue 37

P. Santos et al. / Procedia Structural Integrity 37 (2022) 833–840

838

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P.Santos et al. / Structural Integrity Procedia 00 (2019) 000 – 000

4

Equal energy line

3

2

Absorbed energy [J]

1

Laminate L + Cork

0

0

1

2

3

4

Impact energy [J]

Fig. 4. Energy profile diagram for the materials studied.

Table 2. Constants of the equation for different materials. Composites    Laminate 0.1042 0.7076 - 0.1536 L + Cork 0.0442 0.8677 -0.2693

4. Conclusions Composites involving green epoxy resin and date palm leaflets, variety Elghas, in their natural state were analysed in terms of impact strength. The benefits obtained with the incorporation of a cork layer were evaluated. It was possible to conclude that significant benefits were found when sandwich laminates are compared to the laminates. In terms of maximum load and displacement, regardless of the impact energy, the values obtained for sandwich laminates are always lower than those for laminates. Similar conclusions can be drawn for the restored energy because the capacity of the cork to absorb energy is almost unchanged due to its elastic deformation. Finally, based on an Energy Profile Diagram (EPD) it was possible to obtain the absorbed energy as a function of the impact energy. The good correlation obtained for the analysed impact energies allows the extrapolation of the results with good reliability. 5. Acknowledgements This research is sponsored by national funds through FCT - Fundação para a Ciência e a Tecnologia, under the project UIDB/00285/2020. This work was also supported by the project Centro-01-0145-FEDER-000017 — EMaDeS — Energy, Materials and Sustainable Development, co-financed by the Portugal 2020 Program (PT 2020), within the Regional Operational Program of the Centre (CENTRO 2020) and the European Union through the European Regional Development Fund (ERDF). This work was supported by the Algerian Ministry of Higher Education and Scientific Research via project PRFU: A11N01UN240120190002, as well as by the General Directorate of Scientific Research and Technological Development (DGRSDT). 6. References Aktaş, M., Atas, C., Içten, B. M., & Karakuzu , R. (2009). An experimental investigation of the impact response of composite laminates. Composite Structures, 87(4), 307 – 313. https://doi.org/10.1016/J.COMPSTRUCT.2008.02.003 Amaro, A. M., Reis, P. N. B., Neto, M. A., & Louro, C. (2013). Effect of different acid solutions on glass/epoxy composites. Journal of Reinforced Plastics and Composites, 32(14), 1018 – 1029. https://doi.org/10.1177/0731684413483886 Amroune, S., Bezazi, A., Belaadi, A., Zhu, C., Scarpa, F., Rahatekar, S., & Imad, A. (2015). Tensile mechanical properties and surface chemical