Carbon fiber composite materials

The problems to be solved and the planned goals to be achieved in the project. This project aims to address the significant demand of China's green new energy strategy for lightweight automotive body technology, with the goal of breaking through the basic common bottleneck problem of composite materials in the large-scale application of lightweight automotive body. By combining basic theoretical research, virtual simulation technology, and experimental research methods, a composite material performance research method is established at multiple scales from micro, meso, to macro. Establish connection design and optimization methods for composite materials. And based on this, establish a forward design method for composite material automotive components to the overall body, laying a theoretical foundation and design method for the application of composite materials in automotive bodies. The specific research objectives of this project are as follows: (1) Establish a multi-scale composite material performance research method from meso to macro scale, obtain the elastic-plastic constitutive relationship and damage failure criteria of composite materials, and thus construct the basic input parameters and important underlying foundations for component and vehicle structural design methods. (2) Establish a composite material connection design and optimization method for automotive bodies, providing important theoretical design method support for the overall structural design of composite material bodies. (3) Establish an efficient and fast design method for composite automotive components, improve component performance and reduce component weight. Establish performance testing methods for components, develop structural design, simulation analysis, and testing methods for components, and ultimately provide design method support for the engineering application of composite automotive components. (4) Design for the stiffness, strength, collision, fatigue durability, NVH and other performance of the entire vehicle body, establish a forward design method for composite and metal hybrid vehicle bodies, and provide a design method for the application of composite materials in the entire vehicle body. The lightweight technology of automobiles is an inevitable trend in the development of the automotive industry. With the continuous increase in the world's car ownership, a series of problems such as energy shortage and environmental pollution are becoming increasingly prominent. Reducing automotive energy consumption and reducing environmental pollution has become a key issue that the automotive industry must address. In recent years, lightweight design of automobiles has been proven to be an effective way to solve the above problems and has become an inevitable development trend in the automotive industry. Taking the energy issue as an example, both traditional fuel vehicles and new energy vehicles face the common challenge of "energy conservation", and one of the keys to solving this problem is "automotive lightweight technology". For traditional fuel powered vehicles, according to statistics, for every 10% reduction in self weight, fuel consumption can be reduced by 6% -8%, and greenhouse gas emissions can be reduced by about 13%. The lightweight technology for new energy vehicles is an inevitable trend in the development of the automotive industry. With the continuous increase in the world's car ownership, a series of problems such as energy shortage and environmental pollution are becoming increasingly prominent. Reducing automotive energy consumption and reducing environmental pollution has become a key issue that the automotive industry must address. In recent years, lightweight design of automobiles has been proven to be an effective way to solve the above problems and has become an inevitable development trend in the automotive industry. Taking the energy issue as an example, both traditional fuel vehicles and new energy vehicles face the common challenge of "energy conservation", and one of the keys to solving this problem is "automotive lightweight technology". For traditional fuel powered vehicles, according to statistics, for every 10% reduction in self weight, fuel consumption can be reduced by 6% -8%, and greenhouse gas emissions can be reduced by about 13%. For new energy vehicles, taking pure electric vehicles as an example, reducing vehicle weight by 40% can reduce electricity consumption by about 40%. This indicates that under the same battery capacity conditions, lightweight electric vehicles can significantly increase range, reduce battery consumption throughout the entire life cycle, and reduce battery usage costs. Therefore, whether it is traditional fuel or new energy vehicles, lightweight technology, especially body lightweight technology, is the key technology to improve automotive energy efficiency, reduce environmental pollution, and promote the upgrading and progress of the automotive industry. Composite materials with lightweight and excellent mechanical properties are important materials for achieving lightweight design of automobiles. The use of lightweight composite materials for automotive components is widely recognized as an important development direction in the current lightweight design of automobiles. Composite materials, due to their lightweight and excellent mechanical properties, have gradually replaced traditional metal materials and are increasingly widely used in automotive components with high requirements for lightweight. It is worth noting that composite materials have rich designable parameters due to their unique multi-component and microstructural characteristics, making the design, preparation, and molding of composite automotive components more complex than traditional homogeneous metal automotive components. In addition, the lightweight of the vehicle body is not simply achieved by using composite materials to reduce the weight of the vehicle body. It is a multi-objective system optimization engineering that requires optimization of the vehicle body to minimize the weight of the vehicle body while ensuring efficient manufacturing pace and reasonable production costs. As is well known, the design method of scientific systems is the foundation and precursor of any new material towards practical engineering applications. Therefore, from bottom to top, studying and obtaining the basic properties of composite materials, and based on this, further establishing a design method for composite automotive components, ultimately obtaining a forward design method for hybrid vehicle bodies that includes composite materials and metal materials, is the only way to achieve the widespread application of composite materials in lightweight automotive bodies.