Carbon fiber reinforced composites (CFRP) have the characteristics of light weight, high specific strength modulus and so on, so they are often used in the structural design of UAV composite materials. Carbon fibre composites have strong designability. They can design lightweight, high aeroelastic structures, spray stealth coatings on their surfaces, and reduce the damage tolerance of carbon fibre composites at high speeds. In addition, chips or sensors can be embedded in the matrix structure of composite materials to form intelligent materials and real-time monitoring of structures.
In the structural design of UAV composites, the axial properties of carbon fiber composites and the designability of the direction of the laminated fibers should be fully utilized. According to the research experience, the common structures used in UAV are sandwich structure and laminate structure, such as the fuselage structure consisting of longitudinal beam flange, skin and transverse frame.
In the design of UAV composite structure, the structural stiffness and elastic distribution of UAV are mainly realized by different laying angles and different layers. For example, Helios solar UAV in the United States. The main structure of the UAV is made of carbon fiber reinforced epoxy resin composite material, which is made of asymmetric and unbalanced layers of composite material. Structural stiffness and elastic design of composite materials are perfectly combined.
In addition, small UAVs generally have low flight altitude, low load, slow speed, short duration and other performance deficiencies. In complex environments, the damage frequency of the airframe is relatively high. Traditional metal materials such as aluminum alloy can not meet the development requirements of UAV performance.
Carbon fiber composites have high specific strength and high specific stiffness. As far as materials are concerned, carbon fiber composites can reduce the weight of UAV body by at least 30% compared with aluminium alloy materials, which can greatly reduce the weight of UAV body, increase the payload of UAV, extend the flight distance and time of UAV body, and become the ideal of lightweight, miniaturization and high performance of UAV structure. Material Science.
In order to meet the high performance requirements of UAV, carbon fiber reinforced composites (CFRP) have been widely concerned and applied for its superior performance. Therefore, in the future, various advanced technologies such as lightweight design and development technology, low-cost preparation technology and rapid prototyping technology for large components of CFRP are the key technologies to maintain the structural design of general aircraft in China, and to maximize the expression and utilization of carbon fiber. Special advantages of dimensional composites.