Carbon fiber composite

Problems to be solved and objectives to be achieved in the project: Aiming at the major demand of China's green and new energy strategy for the lightweight technology of automobile body, the project aims to break through the basic common bottleneck problem of composite material in the large-scale application of lightweight automobile body, and combines basic theoretical research, virtual simulation technology and experimental research methods to establish a composite material performance research method from the micro, meso and macro scales. Establish the connection design and optimization method of composite materials. On this basis, the forward design method from composite auto parts to the whole body is established, which lays the theoretical foundation and design method for the application of composite materials in the automobile body. The specific research objectives of this project are as follows: (1) Establish a mesoscopic, mesoscopic and macroscopic multi-scale composite material performance research method, obtain the elastic-plastic constitutive relationship and damage failure criteria of composite materials, and thus construct the basic input parameters and important underlying basis for the structural design method of parts and vehicles. (2) Establish the composite connection design and optimization method for automobile body, and provide important theoretical design method support for the overall structure design of composite body. (3) Establish an efficient and rapid design method for composite automotive parts, improve the performance of parts and reduce the weight of parts. Establish the performance test method of components, form the structural design, simulation analysis and test method of components, and finally provide the design method support for the engineering application of composite automotive components. (4) The forward design method of composite and metal hybrid body is established based on the design of the rigidity, strength, impact, fatigue durability, NVH and other properties of the vehicle body to provide a design method for the application of composite materials in the vehicle body. Automobile lightweight technology is an inevitable trend in the development of automobile industry. With the continuous increase of the number of cars in the world, a series of problems such as energy shortage and environmental pollution have become increasingly prominent. Reducing automobile energy consumption and reducing environmental pollution have become the key issues that the automobile industry must solve. In recent years, automobile lightweight design has been proved to be an effective way to solve the above problems and has become an inevitable development trend of the automobile industry. Taking the energy problem as an example, both traditional fuel vehicles and new energy vehicles are facing the common problem of "energy saving", and one of the keys to solve this problem is "automobile lightweight technology". For traditional fuel vehicles, according to statistics, the fuel consumption can be reduced by 6% - 8% and the greenhouse gas emissions can be reduced by about 13% for each 10% reduction in its dead weight. The lightweight technology of new energy vehicles is the inevitable trend of the development of the automobile industry. With the continuous increase of the number of cars in the world, a series of problems such as energy shortage and environmental pollution have become increasingly prominent. Reducing automobile energy consumption and reducing environmental pollution have become the key issues that the automobile industry must solve. In recent years, automobile lightweight design has been proved to be an effective way to solve the above problems and has become an inevitable development trend of the automobile industry. Taking the energy problem as an example, both traditional fuel vehicles and new energy vehicles are facing the common problem of "energy saving", and one of the keys to solve this problem is "automobile lightweight technology". For traditional fuel vehicles, according to statistics, the fuel consumption can be reduced by 6% - 8% and the greenhouse gas emissions can be reduced by about 13% for each 10% reduction in its dead weight. For new energy vehicles, taking pure electric vehicles as an example, reducing the vehicle weight by 40% can reduce the power consumption by about 40%. This shows that under the same battery capacity, the lightweight of electric vehicles can significantly increase the range, reduce the battery consumption in the whole life cycle and reduce the battery cost. Therefore, whether it is traditional fuel or new energy vehicles, lightweight technology, especially body lightweight technology, is the key technology to improve the level of automobile energy saving, reduce environmental pollution, and promote the upgrading and progress of the automobile industry. Composite materials with light weight and excellent mechanical properties are important materials for lightweight design of automobiles. The use of lightweight composite automotive components is recognized as an important development direction of lightweight automotive design. Because of its lightweight and excellent mechanical properties, composite materials have gradually replaced the traditional metal materials and are more and more widely used in automobile parts with high requirements for lightweight. It is worth noting that composite materials have rich designable parameters due to their unique multi-component and micro-structure characteristics, which makes the design, preparation and molding of composite automotive parts more complex than traditional homogeneous metal automotive parts. In addition, the body weight reduction is not simply to use composite materials to reduce the body weight. It is a multi-objective system optimization project, which needs to meet the requirements and optimize the car body to reduce the weight of the car body as much as possible, and at the same time ensure efficient manufacturing pace and reasonable production costs. It is well known that the scientific and systematic design method is the foundation and guide for any new material to be applied in engineering. Therefore, it is the only way to realize the wide application of composite materials in lightweight automobile body to study and obtain the basic properties of composite materials from the bottom up, and further establish the design method of composite automobile parts and finally obtain the forward design method of hybrid body including composite materials and metal materials.