초록

A hybrid structure comprises a metallic built-up sandwich structure, and a monolithic superplastic formed and diffusion bonded structure joined to the built-up sandwich structure.

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1. A hybrid structure comprising: a metallic built-up sandwich structure; anda monolithic superplastic formed and diffusion bonded (SPF/DB) structure joined to the built-up sandwich structure, wherein at least a non-joining portion of the SPF/DB structure has a reduced thickness relative to the buil

1. A hybrid structure comprising: a metallic built-up sandwich structure; anda monolithic superplastic formed and diffusion bonded (SPF/DB) structure joined to the built-up sandwich structure, wherein at least a non-joining portion of the SPF/DB structure has a reduced thickness relative to the built-up sandwich structure. 2. The hybrid structure of claim 1, wherein the SPF/DB structure has a complex contour. 3. The hybrid structure of claim 1, wherein the SPF/DB structure has a forming radius of curvature of less than six inches. 4. The hybrid structure of claim 1, wherein the built-up sandwich structure and the SPF/DB structure are joined by direct physical contact. 5. The hybrid structure of claim 1, wherein a joint between the built-up sandwich structure and the SPF/DB structure has localized strengthening. 6. The hybrid structure of claim 5, wherein the localized strengthening includes a thickness pad up of the SPF/DB structure. 7. The hybrid structure of claim 5, wherein the localized strengthening includes a shear strip joining the SPF/DB structure to the built-up sandwich structure. 8. The hybrid structure of claim 1, wherein the built-up sandwich structure includes first and second face sheets and a core of metallic ribbons joined between the face sheets. 9. The hybrid structure of claim 1, wherein at least one of the SPF/DB structure and the built-up sandwich structure is treated for noise attenuation. 10. The hybrid structure of claim 9, wherein the SPF/DB structure includes face sheets and a core that forms cells; and wherein at least one of the face sheets has a plurality of openings for allowing noise and air to enter into the cells. 11. The hybrid structure of claim 10, wherein the core includes a perforated septum. 12. The hybrid structure of claim 10, wherein cells are pyramid-shaped. 13. The structure of claim 1, wherein the built-up sandwich structure and the SPF/DB structure form an inner wall of an engine nacelle fan duct; wherein face sheets of the built-up sandwich structure have a plurality of openings for noise attenuation; and wherein the SPF/DB structure accommodates bifurcations. 14. The structure of claim 1, wherein the built-up sandwich structure and the SPF/DB structure are configured as a bleed air duct. 15. The structure of claim 1, wherein the built-up sandwich structure forms an annular portion of an engine plug, and wherein the SPF/DB structure forms a conical portion of the engine plug. 16. The structure of claim 1, wherein the built-up sandwich structure forms a convergent portion of a nozzle, and wherein the SPF/DB structure forms a throat and divergent section of the nozzle. 17. An engine nacelle fan duct comprising an inner wall including a metallic built-up sandwich structure joined by a monolithic SPF/DB structure, wherein at least a non-joining portion of the SPF/DB structure has a reduced thickness relative to the built-up sandwich structure and the SPF/DB structure accommodating a bifurcation. 18. A method of constructing a hybrid structure, the method comprising: forming a monolithic SPF/DB structure;joining the SPF/DB structure to a metallic built-up sandwich structure; andreducing a thickness of at least a non-joining portion of the SPF/DB structure relative to the built-up sandwich structure.