Abstract
In this paper, the quasi-static three-point bending experiments are carried out to study the deformation behavior of square tube and square tube filled with foam aluminum. The difference of bending deformation mode, loading characteristics and energy absorption efficiency between tube and foam aluminum filled tube is compared. And the influence of adhesive between the foam aluminum core and the tube wall on the bending deformation of square tube filled with foam aluminum is analyzed. Based on the bending super beam element model of tube structure, the relationship between the moment and rotation of square tube filled with foam aluminum under transverse static loading is analyzed. And the formula for calculating the moment and rotation angle of square tube filled with foam aluminum at three-point bending is obtained. In order to compare the simulation results, theoretical calculation results and experimental results of quasi-static bending, the three-point bending deformation of square tube and filled with foam aluminum under quasi-static and impact loading is simulated by finite element method. The results show that the filling of foam aluminum can improve the bearing capacity and energy absorption performance of the square tube structure. Under the bending load, the deformation degree of the bearing section is greatly reduced, which increases the bearing capacity of the structure and increases the stability of its bending resistance.
Highlights
Square tube is often subjected to bending load in practical application
As the loading moment is greater than the plastic limit moment of the square tube structure, the tube walls on both sides of the square tube are extruded by the loading punch to produce plastic hinge
The results show that the filling of foam aluminum can improve the bearing capacity and energy absorption performance of the square tube
Summary
Square tube is often subjected to bending load in practical application. The cross-section of the bearing tube will be deformation seriously under the bending load, which leads to the stress concentration and the bending resistance of the structure decreases sharply. The theoretical strength of four failure modes was proposed by Yi-Ming Jen et al [5] Through numerical and experimental studies on the bending performance of foam aluminum filled aluminum alloy tubes under the dynamic energy absorption, it can be observed that the energy absorption capacity increases at high strain rates, which is very helpful for anti-collision applications, and was found by Vignesh Sampathden et al [6] Through the experiments of foam aluminum sandwich and fiber metal laminate on the basis of the new composite structure, compared with the traditional foam aluminum sandwich, the comprehensive performance of the new composite structure is improved, and the optimization parameters of the new foam aluminum composite structure with the best bending strength are obtained by Wang et al [7] The quasi-static three point bending test of the foam aluminum sandwich beam at 25 - 500oC temperature range was used to investigate the quasi-static deformation and failure behavior of the sandwich beam. Yan et al [9] By comparing the theoretical calculation results and simulation analysis results with the experimental results, the mathematical model of the calculation formula of the bending moment and angle of the filled foam aluminum square tube structure was obtained, and the correctness of the theoretical analysis was proved
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