Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 15 5 2025 11 22 Experimental and Numerical Investigation of the Effect of Blast Loading on Sandwich Structures with Metallic Lattice Cores Experimental and Numerical Investigation of the Effect of Blast Loading on Sandwich Structures with Metallic Lattice Cores 3711 10.22044/jsfm.2025.16062.3960 FA Ali Koochakinejad Eramsadati Ph.D. Student, Department of Mechanical Engineering, Islamic Azad University, Tehran, Iran Ali Alinia-ziazi Faculty of Mechanics, Electrical Power and Computer Islamic Azad University, Science and Research Branch Hashem Babaei Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran Shahram Etemadi Haghighi Assistant Professor, Department of Mechanical Engineering, Islamic Azad University, Tehran, Iran Mojtaba Ziya-Shamami Assistant Professor, Faculty of Engineering, Imam Hossein University, Tehran, Iran Journal Article 2025 04 11 Sandwich structures with metallic lattice cores, due to their lightweight and high strength, are widely used in aerospace, automotive, and dynamic load-resistant structures. In this research, the effect of blast loading on sandwich structures with trapezoidal and triangular lattice cores has been investigated both experimentally and numerically. Experimental tests were conducted using the free-air explosion method, and the mechanical response of these structures, including deformation and energy absorption, was analyzed. For numerical simulation, Abaqus software and the CONWEP method were used to model the blast effects. The results indicate that the geometry of the lattice core significantly influences the mechanical behavior of the sandwich structure. Trapezoidal and triangular lattice cores exhibit nearly similar behavior in terms of energy absorption and back face sheet deflection under blast loading. A comparison of experimental and numerical data demonstrates the high accuracy of the numerical model in predicting the structural behavior. The findings of this research can be utilized in the optimal design of blast-resistant structures. Sandwich structures with metallic lattice cores, due to their lightweight and high strength, are widely used in aerospace, automotive, and dynamic load-resistant structures. In this research, the effect of blast loading on sandwich structures with trapezoidal and triangular lattice cores has been investigated both experimentally and numerically. Experimental tests were conducted using the free-air explosion method, and the mechanical response of these structures, including deformation and energy absorption, was analyzed. For numerical simulation, Abaqus software and the CONWEP method were used to model the blast effects. The results indicate that the geometry of the lattice core significantly influences the mechanical behavior of the sandwich structure. Trapezoidal and triangular lattice cores exhibit nearly similar behavior in terms of energy absorption and back face sheet deflection under blast loading. A comparison of experimental and numerical data demonstrates the high accuracy of the numerical model in predicting the structural behavior. The findings of this research can be utilized in the optimal design of blast-resistant structures. https://jsfm.shahroodut.ac.ir/article_3711_052557a932069f149705d33c11d273a4.pdf