It is important to establish techniques to manufacture the parts for aircraft structures at a lower cost in the current aircraft industry. To reduce tool cost, it is necessary to improve the prediction accuracy for ai...
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It is important to establish techniques to manufacture the parts for aircraft structures at a lower cost in the current aircraft industry. To reduce tool cost, it is necessary to improve the prediction accuracy for aircraft part dimensions, which many aircraft manufacturers have attempted to do by introducing simulation technologies. Aircraft structures are primarily made of aluminum alloys, which have a greater springback tendency than steel. Therefore, it is necessary to develop simulation technologies to predict springback. In this research, two examples of applying simulation technologies to the main plastic forming are described. One ishydro-pressure forming. Hydro-pressure forming can reduce the number of dies by applying hydraulic pressure using a rubber pad. The other is stretch forming in which a desired shape is obtained by stretching a sheet over a tool surface. In this research, the results of a finite element method (FEM) were compared with those of experiments and theoretically calculated results to determine the accuracy of the FEM simulation. The FEM results were considerably similar to the theoretical value when appropriate simulation parameters were selected. Although the springback angles of the hydro-pressure forming simulation were in good agreement with the results of experiments, the curvature radius of the stretch forming after springback was smaller than the experimental values.
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