The huge growing world car ownership is great influencing people's work and life, but resulting a series of problems such as energy shortage, environmental pollution is also increasingly prominent. Light-weight, energy saving, environmental protection, safety, comfort and low cost become the target of each car manufacturer, especially in energy saving and environmental protection, which is the major problem for the sustainable development of the human relationship, energy conservation, and emissions reduction has become an urgent problem in the automotive industry. Light-weight of the automobile, which means on the premise of guarantee vehicle performance is not affected, auto-manufacturers should be targeted to reduce automobile weight, to ensure the safety and comfort, and meanwhile should not improve the cost. From the life cycle of the automobile products, a fuel consumption cost is the main part of the vehicle life cycle cost, which occupies 71% of the cycle costs. A
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