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Tham khảo tài liệu 'lightweight electric hybrid vehicle design episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 7 Lightweight construction materials and techniques 7.1 Introduction The opening chapters of this book on propulsion system design demonstrate many of the possibilities for finding solutions for efficient electric traction. In this and the following chapter we consider some of the body structural material specification and running-gear requirements which will prompt an interest in efficient platforms to receive such advanced traction systems. A fuller account dealing with most vehicle types can be obtained in a parallel work by the author . The key to lightweight construction lies in a combination of structurally efficient design covered in Chapter 8 plus the exploitation of advanced materials technology and construction techniques. Steel the traditional building material for the structures of volume cars has excellent property combinations if it can be exploited in structurally efficient designs alloyed to produce high strength sheet then formed and fabricated by such techniques as hydroforming and laser-welded tailored blanking. Light high specific strength and rigidity alloys of aluminium magnesium and titanium also have a place and advanced polymer composite systems have already been proven in race car and similar applications to provide ultra-light solutions. However the future may lay in the wider meaning of composite construction in a combination of metals and polymer compounds fulfilling complementary roles. Monocoque shell structures in high strength sandwich-construction polymer composites are considered against space-frame structures in aluminium alloy. 7.2 The composite approach The use of metal platform base structures and reinforced plastic body shells is established technology for low to medium production cars in several categories and sometimes the weight reductions over all-steel integral sedans are not appreciated by the wider public. Indeed the wider public seems to have forgotten that light-cars of early history were considerably lighter than .
