多胞管增强泡沫铝复合结构的压缩和吸能性能研究

Aiming at low strength and weak energy absorption of aluminum foam, this paper proposes an effective method to enhance aluminum foam:filling metallic multicellular tube into pre-perforated aluminum foam and fixing it with epoxy resin to prepare a new multi-cell tube reinforced aluminum foam composite structure(MTRF). The compression and energy absorption properties of the composite structure were studied by experiment and commercial finite element software ABAQUS/explicit. The experimental results show that compared with those of aluminum foam, the compressive strength and unit mass energy absorption performance of multi-cell tube reinforced aluminum foam structure are increased by 500% and 700%, respectively, indicating the excellent load carrying capacity and energy absorption performance of MTRF structure. Meanwhile, the experimental results verify the accuracy of the finite element model. Based on this, the enhancement mechanism of MTRF is studied by Abaqus/Explicit. The numerical results show that the foam aluminum provides enough lateral support for the multi-cell tube, restraining its lateral deformation under compression load, and makes the deformation mode change from the low order deformation mode to the higher order deformation mode. That is, the number of plastic hinge increases, resulting in a significant increase in the carrying capacity and energy absorption of the MTRF.