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Materials And Automotive Bumper Industry Essay

899 words - 4 pages

1) What is a bumper?A bumper is a shield made of steel, aluminium, rubber, or plastic that is mounted on the front and rear of a passenger car. When a low speed collision occurs, the bumper system absorbs the shock to prevent or reduce damage to the car. Some bumpers use energy absorbers or brackets and others are made with a foam cushioning material.http://www.nhtsa.dot.gov/cars/problems/studies/Bumper/Index.htmlBumper systems have changed drastically over the last 20 to 30 years. More demanding government safety regulations and different styling concepts have resulted in new designs.Materials have also changed dramatically. With emphasis on vehicle performance, High-strength and ultra high-strength steels were developed. These permitted designers to reduce sheet metal thickness, hence weight. For reasons of low cost and light weight, steel is well positioned in the current bumper system market.There are several factors that we must consider when selecting a bumper system. The most important factor is the ability of the bumper system to absorb enough energy to meet the OEM's internal bumper standard. Another important factor is the bumper'sability to absorb energy and stay intact at high-speed impacts. Weight, manufacturability and cost are also issues that we as an engineer consider during the design phase. Both initial bumper cost and repair cost are important. The formability of materials is important for high-sweep bumper systems. Another factor considered is recyclability of materials, which is a definite advantage for steel.There are four common bumper systems to use today:· Metal facebar· Plastic fascia and reinforcing beam· Plastic fascia, reinforcing beam and mechanical Energy absorbers· Plastic fascia, reinforcing beam and foam or honeycomb energy absorberMetal facebar system consists of a single metallic bumper that decorates the front or rear end of a vehicle and acts as the primary energy absorber in a collision.The bumper regulations to withstand a 2.5 mph (4 km/h) impact at the curb position plus orMinus two inches (50 mm) with no visual damage and no damage to safety related items.Plastic fascia and reinforcing beam system consists of a plastic fascia and a reinforcing beam that is fastened directly to the vehicle frame or motor compartment rails. It is primarily used in Europe and Japan, where bumper regulations are less stringent than rest of the world.Bumper systems with a plastic fascia, reinforcing beam and energy absorption are used primarily in North America. Energy can be absorbed by a mechanical absorber, by foam or honeycomb or by the reinforcing beam itselfBumper components:Energy absorbers Fascia, Facebar, Reinforcing beamBumper fascias are designed to meet several requirements. They must be aerodynamic to control the flow of the air around the car and the amount of air entering the engine compartment. They are easy to manufacture and light in weight. Virtually all fascias are made from one...

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