Experimental and Numerical Investigation of the Effect of Blast Loading on Sandwich Structures with Metallic Lattice Cores

Authors

1 Ph.D. Student, Department of Mechanical Engineering, Islamic Azad University, Tehran, Iran

2 Faculty of Mechanics, Electrical Power and Computer Islamic Azad University, Science and Research Branch

3 Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran

4 Assistant Professor, Department of Mechanical Engineering, Islamic Azad University, Tehran, Iran

5 Assistant Professor, Faculty of Engineering, Imam Hossein University, Tehran, Iran

10.22044/jsfm.2025.16062.3960

Abstract

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.

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Journal of Solid and Fluid Mechanics
Volume 15, Issue 5
November and December 2025

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