Abstract
Hot stretch bending (HSB) was an advanced manufacturing process for fuselage structure of aircraft. In this work, U shaped titanium extrusion hot stretch bending was investigated by applying numerical and experimental approaches. Hot uniaxial tension was tested to investigate the deformation behavior. Sequential coupling finite element model setup between electro-thermal coupling and thermal-mechanical coupling was established to optimize U shaped extrusion stretch bending process parameters for electro-thermal-mechanical coupling. The optimal process parameters for hot stretch bending of U shaped extrusion were determined and the springback after hot stretch bended was evaluated. In the bending experimental verification, under the condition of the strain neutral layer Rn of mold was equal to 829.5 mm, the angular springback rate was 0.56%, which is in a reasonable agreement with simulated result of 0.44%.
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