At present, the composite materials used in automobile […]
At present, the composite materials used in automobile manufacturing are mostly fiber-reinforced, or resin-based composite materials reinforced by woven fabrics and non-woven fabrics. Vehicles are exposed to external vibrations during driving, resulting in damage to internal parts. Therefore, transportation vehicles generally need to have better shock absorption. At present, in transportation vehicles, composite boxes with high strength, high elasticity and heat resistance based on fiber reinforced composite materials and PMI foam sandwich materials have been used.
Car spoilers are generally used to increase the grip of high-speed vehicle tires to improve fuel efficiency. However, the spoiler will vibrate under the influence of the high-speed air flow brought by the vehicle, and cause noise. Therefore, the rear spoiler of the car needs to be light in weight and have good shock absorption performance. PMI foam core sandwich composite materials generally use polymer foam quilt as the core layer, and use heterogeneous materials on both sides of the skin, such as carbon fiber reinforced plastics and glass fiber reinforced plastics, to achieve composite through bonding. The sandwich layer composite material has the characteristics of light specific gravity and good shock absorption.
Therefore, in order to meet the requirements of light weight and shock absorption performance of automobile rear spoiler, a sandwich layer composite spoiler was designed and developed using polymethacrylimide foam as the core material and carbon fiber reinforced composite material as the skin. This material is called carbon fiber reinforced sandwich composite material. In order to meet the lightweight and shock absorption requirements of the rear spoiler of the car, this research applies polymethacrylimide foam material and CFRP sandwich composite material to the spoiler, and designs a structurally safe PMI foam core CFRP Sandwich composite spoiler.
Its weight is much lighter than the traditional ABS/PC spoiler. Using reverse engineering and finite element analysis, the design scheme of carbon fiber laminate was obtained. When using five-piece carbon fiber braided prepreg, the PMI-FCCSC spoiler is 28.9% lighter than ABS/PC spoiler, when using four-layer carbon fiber braided prepreg, it is 36.2% lighter, and when using three-layer With carbon fiber prepreg, it is 43.6% lighter.