PSI - Issue 56

Vasilica Ioana Cimpoies et al. / Procedia Structural Integrity 56 (2024) 49–57 Author name / Structural Integrity Procedia 00 (2019) 000–000

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4. Conclusions For all the samples subjected to compressive loads each of the three evaluation methods provide highly congruent results. It can be concluded that these methods can be used together to validate the testing results, as the deviations among them remain consistently below 5% The two different experimental methods used in this case, direct load-displacement measurement and full-field 2D digital image correlation may serve as complementary tools. This proves particularly valuable assessing the behavior of internal points within a structure, a task that may be otherwise challenging to accomplish using alternative instrumentation. The tested samples have demonstrated that an increasing in the number of cells, weather it occurs in the rows or columns, results in a significant enhancement of the structure’s elasticity and a corresponding reduction of its stiffness. It has been validated that the most significant increase is achieved by incorporating symmetrical layers of spiral patterns. As future perspectives will be developed a mathematical model for this type of structure, with the focus on identifying the potential applications for these metamaterials. It is likely that applications will gravitate towards domains that require high elasticity and instant shape recovery. Evaluation of these structures will imply implementation in the numerical models of both geometrical and material nonlinearities and contact between members of quilling-inspired metamaterials. Considering the observed behavior and properties of this metamaterial, exhibits the potential to function as a substitute for conventional spring mechanisms and can also find application in impact absorbing panels and protective plates. References Cernescu, A., Romanoff, J., Remes, H., Faur, N., Jelovica, J., 2014, Equivalent mechanical properties for cylindrical cell honeycomb core structure, Composite Structures, vol. 108, 866-875. Findeisen, C., Hohe, J., Kadic, M., Gumbsch, P., 2017, Characteristics of mechanical metamaterials based on buckling elements, 2017, Journal of the Mechanics and Physics of Solids, vol. 102, 151-164. Fu, M., Liu, F., Hu, L., 2018, A novel category of 3D chiral material with negative Poisson’s ratio, Composites Science and Technology, vol. 160, 111-118. Kshad, M.A.E., Popinigisa, C., Naguib,H.E., 2018, 3D printing of ron-resch-like origami cores for compression and impact load damping, Smart Materials and Structures, vol. 28, no. 1. Mizzi, L., Spaggiari, A., 2021, Chiralisation of Euclidean polygonal tessellations for the design of new auxetic metamaterials, Mechanics of Materials, vol. 153, 2021, 103698. Moreira, D. C., Sphaier, L. A., Reis, J.M.L., Nunes, L.C.S., 2012, Determination of Young’s modulus in polyester-Al2O3 and epoxy-Al2O3 nanocomposites using the Digital Image Correlation method, Composites Part A: Applied Science and Manufacturing, vol.43, issue 2, 304-309. Mousanezhad, D., Haghpanah, B., Ghosh,R., Hamouda, A. M., Nayeb-Hashemi,H., Vaziri, A., 2016, Elastic properties of chiral, anti-chiral, and hierarchical honeycombs: A simple energy-based approach, Theoretical and Applied Mechanics Letters, vol. 6, issue 2, 81-96. Pan, B., Li, K., 2011, A fast digital image correlation method for deformation measurement, Optics and Lasers in Engineering, vol. 49, issue 7, 841-847. Racz, L., Dudescu, M. C., 2022, Numerical Investigation of the Infill Rate upon Mechanical Properties of 3D-Printed Materials, Polymers, 2022, vol. 14, issue 10. Szykiedans, K., Credo, W., 2016, Mechanical Properties of FDM and SLA Low-cost 3-D Prints, Procedia Engineering, Vol. 136, 257-262. Tachi, T., 2013, Designing Freeform OrigamiTessellations by GeneralizingResch’s Patterns, Journal of Mechanical Design, vol. 135, issue 11. Tachi, T., 2017, Characteristics of mechanical metamaterials based on buckling elements, Journal of the Mechanics and Physics of Solids 102, 151 164. Vanlanduit, S., Vanlanduit, J., Guillaume, P., 2009 A digital image correlation method for fatigue test experiments, Optics and Lasers in Engineering, vol. 47, issues 3–4, March–April, 371-378. Zadpoor, A.A, 2016 Mechanical meta-materials, Materials Horizon, vol. 3, 371-381. Zhou, X., Ren, L., Song, S. et. al., 2023, Advances in 3D/4D printing of mechanical metamaterials: From manufacturing to applications, Composites Part B: Engineering, vol. 254, 110585.