| The thinking of honeycomb sandwich structure comes from the "genius mathematician and designer"-Bee. With the advantages of lightweight, high-strength, high stiffness, the honeycomb sandwich structure material must be play an important role in the field of wind energy. At the present time, the common honeycomb panels are glued honeycomb panels home and abroad, the junction between panel and core is physical combination in glues aluminum honeycomb panel(GAHP), the strength,service life and the tolerance work environment were confined by adhesive. It is limitation to get better performance through improve and increase adhesive performance. The braze welding is one of the perfect methods of substitution glues.The brazing junction between panel and core is metallurgical combination in brazed aluminum honeycomb panel(BAHP), and all of mechanics properties are better than glued aluminum honeycomb panel(GAHP) at the same standard. In addition, for disadvantages of the complicated preparation technique and difficult industrialization of the present welded aluminum honeycomb panel, this paper creatively puts forward a new structure honeycomb panel the π type structure aluminum honeycomb panel.Based on some preliminary study, this paper mainly focus on the methods and mechanical properties of the brazed aluminum honeycomb manufacturing and researches the mechanical properties of aluminum honeycomb by the Ansys simulation. The research work and results including:1. The brazed aluminum honeycomb flat compressive deformation process included the following four stages:elastic buckling, plastic buckling insTableility, plastic strengthening of the honeycomb core and densification; The brazed aluminum honeycomb flat compressive test and simulation display panel only pass axial pressure has no effect on the siding when the platen process insTableility; the double honeycomb core wall mainly support the load, and the single-layer honeycomb core wall connected and restrained the double honeycomb core. But in the π-type structure aluminum honeycomb panel, the walls connect and constraint each other.2. The flat crush strength formula of the BAHP is: and The flat crush strength formula of the π-BAHP is:However, the flat crush strength of the π-BAHP is0.13-0.45MPa lower than the traditional BAHP,because the wall plats in π type aluminum honeycomb panel connect each other.3. When the Brazed aluminum honeycomb panel is subjected to edgewise compressive load, the left and right panels through its own deformation of the vertical load into a horizontal intermediate cellular core. The insTableility deformation modes of the edgewise compressive affected by the intermediate honeycomb core ordering way. The longitudinal edgewise compressive of the aluminum honeycomb occurred the dimple type insTableility, while the lateral edgewise compressive generated the shear wrinkling insTableility, pressure strength of the aluminum honeycomb longitudinal side compressive strength is greater than the lateral side. The ultimate load of longitudinal side compressive strength is about12%higher than the lateral side compressive pressure.4. The edgewise compressive of the π type aluminum honeycomb panel is higher than the traditional brazed aluminum honeycomb panel. the longitudinal edgewise compressive of the π type aluminum honeycomb panel is1.3%～5.5%higher and the lateral edgewise compressive edgewise compressive of the π-BAHP is4.2%～10%higher than the traditional BAHP.5. When the brazed aluminum honeycomb panel subjected to bending loads, according to the face sheet tensile and compressive strength and shearing rigidity of the honeycomb core, it showed three typical failure modes:the collapse of the honeycomb core failure, the overall the curved failure and panel shear failure.6. In the edgewise compressive simulation process of the brazed aluminum honeycomb, the deformation mode and actual test is similar, but load in the simulation test results is slightly larger than the actual value, the longitudinal edgewise compressive limit load is greater than the lateral side of the pressure limit load. The longitudinal three-point bending failure load is about2.2%～10.8%, but the difference value of the lateral three-point bending failure load is about5.8%～12.9%.7. The combination property of the π type aluminum honeycomb panel is better than the traditional brazed aluminum honeycomb panel. The innovation of this paper mainly reflects in proposing that using the shield gas-Nocolok brazing method to prepare the brazed aluminum honeycomb panel. Meantime during the course of the study, for disadvantages of the complicated preparation technique and difficult industrialization of the present welded aluminum honeycomb panel, the π type structure aluminum honeycomb panel (ZL200710065822.8) is put forward creatively in this paper. In actual application process, the π type structure aluminum honeycomb panel has been applied to manufacturing the wind power blade.8national patents are applied, a national invention patents and5utility model patents have been authorized. The further study and future application of the brazed aluminum honeycomb panel has been discussed in the last part of this paper. |
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