A composite plate and shell structure
This entry is missing Overview , add relevant content to make the entry more complete, and it can also be upgraded quickly. Hurry up edit Come on! Sandwich structure is a composite structure of plate and shell. Its two surfaces are made of very thin plates, and a light sandwich layer is sandwiched between them.
- Chinese name
- Sandwich structure
- English name
- sandwich structure
- definition
- Plate and shell structure composed of panel and loose or light sandwich layer.
- Applied discipline
- Aviation science and technology (first level discipline), aircraft structure and its design and strength theory (second level discipline)
- Chinese name
- Sandwich structure
- Classification
- construction business
Structure introduction
Sandwich structure is a composite structure of plate and shell. Its two surfaces are made of very thin plates, and a light sandwich layer is sandwiched between them. The former is called surface plate, which requires high strength; The latter is called sandwich and requires light weight. the Second World War In order to make full use of wood resources, the British "Mosquito" bomber used a fully wooden sandwich structure. The general sandwich structure is used for the wing, tail wing, fuselage, arrow body, arrow, speed brake, engine nacelle, sound insulation device Fire barrier Etc. Compared with the thin skin of thin-walled structure, the sandwich plate is much thicker, has strong stability resistance, can reduce weight, and has smooth surface and good aerodynamic shape. However, its manufacturing process is complex, and the process quality is not easy to inspect, so its application is limited. The materials of sandwich structure surface plate include aluminum alloy, stainless steel, titanium alloy and various composite materials. Sandwich materials include light wood Foam plastic Etc., also available Metallic materials Or composite material made of corrugated plate sandwich or honeycomb sandwich (see honeycomb structure). The interlayer and the surface plate are generally bonded together with glue, and can also be connected by fusion welding and welding to form a whole. In the overall stress analysis, it is considered that the upper and lower surface plates only bear the tension, pressure and shear forces in the surface plate plane, and cannot bear the bending moment and torque, while the middle interlayer only bears the shear force perpendicular to the middle plane of the interlayer. The difference between sandwich structure and general plate and shell structure is that in addition to the deflection caused by bending moment, the influence of shear force should be considered in the deflection calculation. The distance between the two surface plates of the sandwich structure is large, so the Bending stiffness It is much larger than the general plate and shell structure, and the critical stress of instability is significantly increased. The sandwich structure itself does not use rivets, which avoids the problems caused by nail holes Stress concentration The fatigue strength is improved. The connection between sandwich structure and adjacent structure is more complex, the local contact strength of sandwich itself is weak, and it needs to bear the concentrated force of connection, so the joint design must be properly carried out. 
