Brazing Of Cellular Aluminum Quasi Static Pressing And Dynamic Impact Mechanical Properties Of Numerical Simulation

Aluminum honeycomb panels was first used in the aerospace field, the design concept originated bionics, because of its light weight, high strength good rigidity, heat insulation,soud insulation, and so a series of advantages. The aluminum honeycomb also widely used in construction, military, energy, transportation and other fields.Domestic and foreign common aluminum honeycomb are adhesive honeycomb panels, its strength, service life, and work environment to a large extent constrained by adhesive. Welding manufacture aluminum honeycomb, the connector for the metallurgical combine, and its mechanical properties significantly higher than other adhesive products in the same specification. Therefore, the research and development with excellent performance welding aluminum honeycomb has great significance. In recent years, Domestic and foreign scholars mostly focused on researching of the aluminum honeycomb in-plane performance and in-plane equivalent parameters, while the properties of aluminum honeycomb panel under dynamic load impact study less. In order to expand its application areas, it is necessary to study the impact properties of the aluminum honeycomb. Brazing aluminum honeycomb, on an experimental basis, using computer simulation software ANSYS, to simulate the process of honeycomb aluminum under quasi-static compression and dynamic impact loading, to improve efficiency at the same time, for further theoretical research product design foundation. The content and conclusions of this study include:(1) Derived mechanical parameters of the aluminum honeycomb panel, Introduced the quasi-static compression and dynamic impact test of welding aluminum honeycomb, welded aluminum honeycomb platen deformation through four stages, respectively, the elastic deformation, plastic deformation, crushing deformation, densification stage. Welding aluminum honeycomb by the ball hit on the panel to form a permanent collapse pits, and the impact area of the honeycomb core crushing deformation. No stripping and pentration phenomena occurred in the aluminum honeycomb panels.(2) Study the influence of honeycomb core structural parameters (the side length of the core, core wall thickness, side length to thickness ratio of the core, side length to height ratio of the core) for flat crush performance. Found that the core wall thickness increase (decrease), reduce (increase) the side length of the core, The capacity of resistance pressure increased (decreased). When the side length of the core is smaller (larger), The influence of wall thickness of the core for platen performance is smaller (larger), and under the same size parameter tc/l, More longer(shorter) the core side length, More higher(lower) the compressive strength. With the structure parameter h/l increasing, Aluminum honeycomb flat compressive strength showed a decreasing trend after the first increase.(3) Using ANSYS finite element software to simulate the process of welding aluminum honeycomb by the ball impact. Analyzed the deformation of the aluminum honeycomb, stress distribution, and study the different impact energy and structural parameters (density of the honeycomb core, height of the core, thickness of the skin plate) on the impact deformation and energy absorption. Concluded that, the greater the impulse of the ball, the higher the peak contact force between aluminum honeycomb panel and ball. the shorter the contact time, the greater the impact dent depth and damage area, the higher the ratio of absorb energy and impact energy. Increase the core density can resist impacting deformation, the greater the density, the shorter the contact time, the higher the peak contact force. Density increases (decreases), Energy absorption ratio of core increase (decrease), Energy absorption ratio of plate decrease (increase), total energy absorption has little effect on the structure. Height of the core has little influence on impact deformation and energy absorption, The height of core is a parameter to consider the structure and layout, as well as honeycomb core side length of a certain ratio. Thickness of skin plate is inversely proportional to the impact deformation, panel thickness has little influence on the energy absorption of aluminum honeycomb panels.