The density of steel is 7.8, while the density of aluminum is 2.7, aluminum alloy can use more than 500kg in a vehicle, the effect is that the vehicle weight can be reduced by about 40%. Aluminum automotive body
lightweight benefits are self-evident, from the performance of the power, fuel economy to handling performance will be greatly improved.
If the strength of the car body is increased and the strength of the safety theory is enhanced, the aluminum alloy will be slightly inferior to the steel plate, but the low density makes the aluminum alloy have greater advantages. The equal strength steel plate and the aluminum alloy have a thickness ratio of 1:1.4, and the weight ratio is only 1: 0.5 means that aluminum alloy can achieve the same strength with only half the weight. The aluminum plate used in general aluminum car body
is 0.2-0.5mm thicker than ordinary low-carbon steels. By increasing the thickness, it is possible to achieve higher body rigidity and torsional resistance than high-strength steels.
This is directly linked to the previous two points in terms of improved handling. Lighter weight can reduce body inertia and increase the thrust-to-weight ratio. Power performance at the same power level can be greatly improved. After increasing the body's rigidity and torsion resistance, it is equivalent to the body's increased effect of reinforcing the tie rod, which can leave more room for the suspension adjustment and increase the limit of the body. In addition, aluminum car body are generally optimized for chassis suspension. For example, few aluminum automotive body models swing back to steel, while all-aluminum suspension components can reduce the unsprung mass and have a certain amount of control lift help.