PSI - Issue 33

Alexey Fedorenko et al. / Procedia Structural Integrity 33 (2021) 652–657 Fedorenko A., Fedulov B., Jurgenson S., Lomakin E./ Structural Integrity Procedia 00 (2019) 000–000

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The loading diagrams are shown in Fig.6. for both concepts with representation of the ultimate force of pure concrete plate. The proposed concept shows the ultimate force of 74,000 kN, while the conventional one only 52,000 kN, so the increase factor is 1.4. The slope of loading curves in the elastic range is similar for the both concepts, so no enhancement in stiffness for the proposed sandwich, and one can conclude in this case stiffness is governed by the concrete. The ultimate force of pure concrete is 32,000 kN. Notice pure concrete strength in Fig.6 was also estimated by simulation, but it is close to the simple calculation as a product of a compression yield limit (Table 1) and a cross-section area.

Fig. 6. Loading diagrams of proposed, conventional and a pure concrete plate without reinforcement

Conclusion The compressive loading case was considered for the comparison of strength properties of the conventional concrete plate with bar reinforcement, and the proposed concept of the plate based on sandwich with pyramidal core. The ultimate force is extremely large for the both concepts, but it is increased up to 1.4 times for the proposed concept. Together with promising characteristics of the proposed structure under bending, presented in previous work [6], it seems effective for custom industrial applications, where enhanced requirements to stiffness and strength are hardly satisfied by conventional plates. Acknowledgements This research was supported by the Russian Science Foundation (grant No. 20-11-20230). References [1] A.G. Evans, J.W. Hutchinson, N.A. Fleck, M.F. Ashby, H.N.G. Wadley, The topological design of multifunctional cellular metals, Prog. Mater. Sci. 46 (2001) 309–327. https://doi.org/10.1016/S0079-6425(00)00016-5. [2] G.W. Kooistra, V. Deshpande, H.N.G. Wadley, Hierarchical corrugated core sandwich panel concepts, J. Appl. Mech. Trans. ASME. 74 (2007) 259–268. https://doi.org/10.1115/1.2198243. [3] B. Wang, L. Wu, L. Ma, Y. Sun, S. Du, Mechanical behavior of the sandwich structures with carbon fiber-reinforced pyramidal lattice truss core, Mater. Des. 31 (2010) 2659–2663. https://doi.org/10.1016/j.matdes.2009.11.061. [4] H.N.G. Wadley, N.A. Fleck, A.G. Evans, Fabrication and structural performance of periodic cellular metal sandwich structures, Compos. Sci. Technol. 63 (2003) 2331–2343. https://doi.org/10.1016/S0266-3538(03)00266-5. [5] Y. Zhu, Q. Qin, J. Zhang, On effective mechanical properties of an orthogonal corrugated sandwich structure, Mater. Des. 201 (2021) 109491. https://doi.org/10.1016/j.matdes.2021.109491.