Stress Analysis on the Stretch Forming of the Aluminum Saddle-Shaped Skins

Abstract

The stretch forming applied force during the forming process and exceed the yield stress of the raw material to make the part deforming plastically, and fitting the contour of a form block, then the purpose of forming can be reasonably achieved. The saddle-shaped skin located in the mating area between the vertical stabilizer and the empennage. This study investigates the stress distribution on the stretch forming of saddle-shaped skins. First, apply the FEM software-ABAQUS to analyses the stretch forming of saddle-shaped skin. Then use the statistical method to analysis the stress in different forming conditions. Finally, the stress of saddle-shaped skins on the critical location is analyzed and discussed. This study aims to modify the process parameters in advance to prevent the failure and defects of skin and provide valuable information for both production engineer and tool designer to improve their design of process parameters and form block.

Determination of Tool Motions in Stretch Forming Process for Aerospace Applications by Using Finite Element Method

“…In the previous works, no study is related to the comparison of the strain measurements between optical and numerical analyses. Chikong et al examined influence parameters on springback occurrence during stretch forming of dorsal skin which is made out of AA 7075-W [3]. Cai et al studied on numerical modeling of multi-point stretch forming process to form parabolic, saddle shaped and sphere parts in order to make a comparison with the simulations performed for traditional stretch forming operation [4].…”