Study On Buffering Characteristics Of Multi-layer Foamed Aluminum Filled The Expanded-rube Compound Structure

During the test of the projectile penetrating a hard target such as rock and concrete,the ballast test device is often subjected to failure due to the high overload caused by the impact.Reducing energy absorption technology is an important method for effectively protecting internal devices under impact and collision conditions.It is an ideal choice to absorb and transform the impact energy generated by impact collision with materials with high degree of plastic deformation and expansion ring structures.In this paper,theoretical models,numerical simulations and experimental methods are combined to analyze the dynamic mechanical response and cushioning properties of foamed aluminum energy absorbing materials,expanded rubes,and the plastic deformation of the combined expanded rube structures.The study is as follows:(1)From the theoretical aspect,the deformation characteristics and energy absorption mechanism of the expansion ring structure are expounded.Based on some basic assumptions for establishing the model,the mechanical model of the quasi-static lower expansion ring structure is introduced.Based on the analysis of the dynamic mechanical properties and deformation mechanism of aluminum foam,a theoretical model of foamed aluminum and expanded rube composite structure is established and the energy absorption mechanism of the composite structure is analyzed.The numerical calculation and experimental research are provided for this purpose.reference.(2)The counter-ballistic experiments were used to simulate the buffering and load-reducing characteristics of the expanded rube structure under impact conditions and measure its mechanical parameters.(3)Finite element software was used to numerically analyze the dynamic response and energy absorption of positive and negative gradient aluminum foams under quasi-static conditions,and further studied the structure of expanded aluminum ring-filled expanded rube composite structures.It is found that the energy absorption capacity of the gradient foam aluminum filled expanded composite structure is greatly improved compared with the expanded rube structure under the condition that the structural space is fully utilized.(4)The finite element software was used to simulate the reduction of the test device overload of the gradient-filled expanded-compression energy absorbing warhead,and the reliability of the selected finite model was verified by comparing the theoretical model calculation results with the simulation results.Numerical simulation studies and analyzes the ballistic characteristics of projectiles penetrating a three-tiered reinforced concrete spacing target and the effectiveness of its expanding-ring composite structure in buffering and reducing the load of the missile-loaded test device during the projectile's penetration of a multi-layered target.