At the beginning of the automobile, there were not many vehicles and the speed was not fast. Generally speaking, the speed is 30-40 km/h, so the probability of accidents between cars and pedestrians is very low. But now, with the continuous improvement of people's quality of life and the surge in the number of cars, the probability of accidents between vehicles and pedestrians has increased significantly. As a vulnerable group, pedestrians are often the most direct victims in accidents with cars. Therefore, in the current vehicle design, the protection of pedestrians has been promoted to a very high position. The appearance of plastic bumper is quite obvious for the protection of pedestrians (provided that at a certain speed).
The role of plastic bumper in car-to-car collision (also at low speed). We know that one of the characteristics of plastic is that it has certain ductility, and even if there is some deformation, it can recover itself to some extent.
The appearance of bumper is the best of both worlds for reducing vehicle weight and protecting pedestrians. Therefore, the role of plastic bumper in reducing vehicle weight is also based on protecting pedestrians.
Reduce cost, facilitate design and production, and prevent corrosion.