| Summary: | 博士 === 國立中央大學 === 機械工程學系 === 101 === Superplastic forming processes usually uses flat sheet to produce simple and symmetrical shapes, however, complicated and non-symmetrical shapes are rarely produced by using superplastic forming. This thesis focuses on using superplastic forming to manufacture the aluminum ” Airplane Fairing Cover” used on an actual commercial airliner. Using the superplastic aluminum alloy 5083, the material was processed into a V-shaped sheet. The Friction effect of between material and die wall in the high-temperature environment will influence the deformation trend of the material. So, this thesis utilizes the forming trend of the rectangle opening box, and then applies to deformation trend of bending preformed sheet. Also try the V-shaped sheet drawing forming process and reverse forming process. The pressure-time curves were calculated for commencing superplastic forming process.
This thesis also uses finite element software suite ANSYS/LS-DYNA to combine the experiment to analyze the superplastic forming process of 5083 aluminum alloy, and discuss the influence of the final thickness distributed of airplane fairing cover in order to verify the numerical simulation analyzed of feasibility and reliability. The ANSYS/LS-DYNA provides a useful tool for designer to understand the geometry appearance of the die in the design level, and reduces the trial tests and shortens the product development process in order to keep costs down. In this thesis, there are compare of numerical analysis and superplastic forming experiments. The results show both the final thickness distribution tends to be consistent. Therefore, the ANSYS/LS-DYNA is capable of predicting the superplastic forming experiment with complementary effects.
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