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Aerospace structure requires lightweight panels to obtain weight saving and strength. It is well known that lightweight and stiff, sandwich panels are one of a vital element of aerospace structural design. In sandwich structures, the face sheets are the main load-bearing element. Since conventional polymer matrix composite materials have a limitation for elevated temperature application, metallic sandwich structures must be used in for elevated temperature application, like propulsion system. In this study, it is demonstrated that superplastic blow forming process with titanium and IN718 can be applied to manufacturing of metallic sandwich structure with cores for lightweight structure of aircraft structural panels and propulsion components. The result shows that the developed technology to process design of gas blow forming by the finite element method can be applied for near net shape forming of various sandwich structures from pre-welded panels. Keywords-manufacturing; sandwich; aerospace; high temperature; propulsion; titanium

Superplastic Blow Forming of Welded Sandwich Panel for Elevated Temperature Application