Dynamic Response of Aluminum Foam Filled Pipes under Lateral Explosive Load

A combination of numerical simulation and theoretical analysis is used to study the dynamic response of foamed aluminum filled pipes under lateral explosion loads. The finite element software ABAQUS/EXPLICIT was used to carry out a numerical simulation study on the plastic deformation of the aluminum foam-filled tube under lateral explosive load, and the influence of the relative density of the foam aluminum, the diameter and wall thickness of the outer tube and other factors on the dynamic response of the structure was analyzed. Based on the ideal rigid-plastic foundation beam model, combined with the modal analysis method, a theoretical analysis model for predicting the mid-span deflection of the foamed aluminum filled pipe under lateral explosive load is established, and a dimensionless analysis is carried out. The change of the dimensionless deflection of the mid-span with the elementary impulse is obtained. The error between the theoretical prediction and the numerical simulation result of the foamed aluminum filled pipe mid-span deflection is within 20%, indicating that the established theoretical analysis model is reasonable and feasible. The relative density of foamed aluminum has a great influence on the mid-span deflection of the filled pipe under lateral explosive load. As the relative density of foamed aluminum increases, the mid-span deflection of the filled pipe decreases. As the diameter and wall thickness of the outer tube increase, the mid-span deflection decreases. The two modal functions assumed in the theoretical analysis have little effect on the mid-span deflection of the filled pipe.