Fig. 1 Examples of lightweight material applications1.Introduction2.2 Efficiency improvement of materials processing 612. Challenges in vehicle body weight 2.1 Backgrounddevelopmentreduction*CP and Test Engineering Methodology Innovation DepartmentConsidering the accelerating global competition to develop electric vehicles, product competitiveness is enhanced by increasing the cruising distance. Motor efficiency and battery power density are also increased, and the vehicle weight is reduced to further improve the performance of the electric powertrains, which requires streamlining part structures. Nondestructive measurement technology using X-ray computed tomography (CT) can be used in the research and development phase to analyze fine internal structures whose performances and conditions can change from those of the original when disassembled as three-dimensional profile data. The findings of this analysis can contribute significantly toward improving the performance of electric vehicles.This study focuses on the use of X-ray CT for vehicle body weight reduction, which is gaining popularity given the advancements in electrification. Structural design technology that optimally combines materials with different physical properties is necessary to realize vehicle body weight reduction. The multi-materialization of vehicle body parts has evolved from using conventional steel sheets to using high-tensile steel sheets, aluminum alloy sheets, resins, carbon fiber-reinforced plastics (CFRP), and other materials, as presented in Fig. 1, in addition to structural streamlining.(1)In this chapter, materials indispensable for multi-materialization and examples of applications to enhance the technological development of bonding dissimilar materials are presented, followed by the prospects for this measurement technology.The supply chain for materials and parts in the automotive industry has become globalized, and this has prompted the expansion of local development and manufacturing bases. When developing lightweight vehicle bodies that combine individual part materials to achieve the performance goals by combining various materials, facility requirements of a manufacturing base must be considered. For example, the internal structure of joints for dissimilar material bonding and fiber orientation inside the material responsible for ensuring the strength and stiffness of carbon fiber-reinforced plastics (CFRP) must be evaluated. The design optimization of material processing based on the evaluation of several prototypes is necessary to achieve these performance goals.Bonding Recently, the application of CFRP has expanded from the aerospace to automotive fields owing to improvements in material technology. Resin injection molding, press molding, injection molding, and other methods have been used based on application requirements. Resin injection molding is a process where carbon fiber is formed into a part shape in a mold and injected with resin to impregnate itself with the resin and harden it.indicators that Performance internal structure, which represents technologies for dissimilar materials (mechanical, solid phase, and adhesive bonding) depend on the application and material characteristics. For example, self-piercing riveting (SPR), used in mechanical bonding technology, is a joining method wherein the leg of a rivet piercing the upper plate is spread without piercing the lower plate.indicate processing results such as strength, stiffness, and durability, and the factors associated with the processing parameters, are analyzed during the development of the material processing processes. The internal structure of prototyped parts 6. X-ray CT Nondestructive Measurement Technology Supporting Vehicle Body Weight Reduction TechnologyYasuhiro Kanda* Yoshitaka Usui*
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