Research On Computer Aided Design Of Composite Frame Of The Special Heavy Truck

This paper summarizes the present application and research situation of composite in domestic and international automobiles, introduces the development trend of composite in weight-reducing design of automobile and analyzes the backward fields and weakness of composite application in domestic automobiles. On the basis of those, the research ideal of weight-reducing design by composite is given for the supporting frame of the special heavy truck.Subsequently, the structural characteristics of the truck are introduced as well as its steel frame according to the research requirement, and then analysis of the frame using finite element method (FEM) is also carried out in various load cases. From the calculated results, the deformation parameters of the frame in corresponding cases are derived, which establish a good foundation for weight-reducing design of the frame.According to the performance and development trend of composite, based on load capacities of the frame beam, a channel steel beam and a I-steel beam both made of carbon fiber reinforced polymer(CFRP) are designed and their stress and deformation are analyzed using FEM. Afterwards, the influence of different factors such as cross sectional dimensions and laminated projects on the beams' performance is further studied. Eventually, design of two kinds of composite beams is compared with each other. Research results provide a valuable basis for the design of the composite frame.Based on research above, according to the requirement of weight-reducing design, a composite frame project with CFRP without changing the frame's shape is studied and then a eligible project is obtained, which accomplishes the design requirement with better stiffness and strength. Afterwards, the influence of different laminated projects on the frame's performance is also researched.In order to seek better design, optimum design of the composite frame is studied using FEM. The first optimum model is established with the target function of the frame's weight as well as with the design variables of the beam's single layer thickness. The second optimum model is established with the target function of the frame's maximal deformation and with the design variables of the beam's layer angles. Better results are obtained for both models. The optimum research is of greatreference to improving design of the composite frame.ALL the research in this paper offers a valuable reference to design and application of composite main supporting components of domestic automobiles besides special heavy trucks. In the meantime, it is also greatly helpful for further application of new materials and technology.