In everyone's inherent impression, the bumper is to protect people and cars, and it should be extremely hard. But judging from the materials used in modern cars, most household car bumpers are made of plastic, so many people will have doubts, plastic is so thin, compared with strong steel materials, it can really protect our role?
In fact, the early car safety concept was mainly to protect the car body, so steel and other metal materials were mostly used in the selection of car manufacturing materials. The front and rear bumpers of cars are stamped into U-shaped channel steel with a thickness of more than 3 mm. It is chrome-plated, riveted or welded with the frame rail, and has a large gap with the body, relying on a strong shell to protect the safety of the car body and occupants. But it's like an added part, and it looks pretty ugly.
However, with the development and progress of the times, people have found that the strong shell and the protection of the passengers in the car are not good. The reason is that these hardware cannot be buffered in the event of a collision. Pedestrians are also at great risk. With continuous attempts, people continue to seek more advanced safety solutions, and put forward the safety concept of "collision buffer energy absorption".
After numerous tests and summaries, people found that plastic bumpers are a good choice, because plastic bumpers have good elasticity and have a certain impact resistance, and they also take care of the safety of passengers in the car. If you accidentally hit a pedestrian, the plastic bumper will effectively absorb the impact force of the frontal collision with the pedestrian, so that the degree of injury to the pedestrian is minimized. Fiat was the first to use plastic bumpers. In 1976, Fiat in Italy produced the world's first bumper using a blend of polypropylene and ethylene-propylene copolymer from Hearst, Germany, and then major manufacturers followed suit.
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