Why is the front and back of the car made of raw material?
What you want is not strong and too strong, and you are in heaven. Almost all car bumpers are made of synthetic plastic. It has good elasticity and will not deform. It automatically breaks after absorbing energy. It is not only light but also practical. To say cheap or iron, the cost of these synthetic plastics is not low!!
Of course, most of these are for cheap cars, and some models don't do that. For example, Laosilaisi's bumpers aren't plastic. Plastic bumper with elastic and a bit, is slight collision or scratched, the plastic bumper has good elasticity, have certain impact performance, that is to say, if the situation did not knock a small touch, plastic bumper can automatically rebound automatic repair, even off the paint. It is better than concave, after all, painting is much cheaper than sheet metal repair plastic material is more advantageous to protect pedestrians in addition to these, the plastic bumper also can protect the pedestrian effect, after the car steel and not rely on the bumper to bear, or look at the main body frame. But because the plastic bumper material, with more flexibility and better absorb the impact force than the metal, so we often see the network of bicycle crash bumper and so on this type of picture, think carefully, if the metal bumper, tragedy is likely to pedestrians and bicycles.
Because for the car prices, the most direct effect is to save manufacturing costs, but not only that, plastic bumpers to some extent, but also to protect the interests of consumers. In some densely populated countries in Europe, the car ownership, parking nature is very scarce, the owners often have to close together, this time on the plastic bumper has played a key role, if the car is not crowded into the narrow parking space, can use the low speed gently push the front or rear the vehicle, convenient "push" to the parking space. Especially in the crowded streets of London, do not pull the handbrake parking is the It's only human. is for the convenience of others, such as parking. Don't be surprised if someone finds someone parking one day and "scratches" to his bumper. This is the unspoken rule that everyone knows".
Of course not safe plastic has a strong bow force and iron is relatively poor is the role of energy absorbing bumper plastic deformation under impact and brittle and easy to rupture in the medial surround there are a few small column impact can break and decrease the intensity of the impact also reduced the degree of deformation of many cars are
