Study On Static Mechanical Properties And Energy Absorption Performance Of Aluminum Matrix Composite Foam-filled Circular Tube

The breeding and spread of terrorism is a major threat of the current world’s security and social stability. After the incident of 911, the explosion and shock resistance of structures gradually become a hotspot in the field of civil engineering. Currently, thin-walled metal tube and metal foam filled tube are widely used in energy absorbing. These two types of components have been proven by engineering practice and they have excellent energy absorption capability. In recent years, domestic and foreign scholars used fly ash and aluminum prepared an aluminum matrix composite foam material. This material has a higher yield strength and greater energy absorption properties compared to conventional metal foam. But it prone to brittle fracture and difficult to use as energy absorbing component separately If we combine this kind of new material and thin-walled metal tube together to create an aluminum matrix composite foam-filled tube, it is bound to make good energy absorption effect. In this paper, three kinds of aluminum matrix composite foam whose average particle diameter are 150μm, 200μm and 300μm were made, and they were made into aluminum matrix composite foam-filled tube with 304 stainless steel. Its axial compression, transversal compression and three-point bending performance were studied, the specific contents are as follows:(1) Electronic universal testing machine was used to test three kinds of aluminum matrix composite foam-filled tube’s axial compression performance. The indicators which evaluate the mechanical properties and energy absorption performance were given. The type of the core, diameter-thickness ratio and height-thickness ratio’s effects to specimen’s deformation failure mechanism, mechanical properties and energy absorption properties were studied. Using finite element software LS-DYNA to simulate the experimental results, and the influence of the thickness to the average compressive load was studied. Fitting out the average compressive load formula of aluminum matrix composite foam-filled tube.(2) Electronic universal testing machine was used to test aluminum matrix composite foam-filled tube’s transversal compression performance. The type of the core and diameter-thickness ratio’s effects to specimen’s deformation failure mechanism, mechanical properties and energy absorption properties were studied. The influence of the thickness to the average compressive load was studied by numerical simulation.(3) Electronic universal testing machine was used to test aluminum matrix composite foam-filled tube’s three-point bending performance. By changing the tube’s wall thickness, the type the core and the effective filled length, the effects of these parameters on the performance of the three-point bending were studied. The relationships among the thickness, the average compressive load, and the specific energy absorption were studied by numerical simulation.