Prestressed Rod Stiffened Composite Structures

摘要

A structurally efficient rod-stiffened panel incorporating pretressing benefits is provided, the prestress provided by pultruded rod which is already in the system. The pultruded rods being retained in either tension or compression stresses apply prestressing via interfacial behavior. The new system improves the efficiency of structural composites by tailoring the stress system within structure to fully utilize the structural potential of various components, and to avoid premature local failures within composite structures. A method for producing a prestressed rod stiffened composite structure is also provided.

主权项

1. A prestressed rod-stiffened composite panel comprising
unidirectional fiber composite elements, generally at least one of cylindrical rods, oval rods and cylindrical tubes; a multiaxial fiber composite constituent comprising skin and stiffeners, where the stiffeners wrap around and bond to said unidirectional composite elements; where the multiaxial fiber composite constituent and the unidirectional fiber composite element are subjected to opposite prestressing forces for improving the structural performance of the rod-stiffened composite panel; wherein said prestressing forces are applied to the unidirectional fiber composite elements using at least one of thermo-mechanical and hydraulic methods, with said forces balanced against reactions applied to temporary external supports before establishing bond between the unidirectional fiber composite elements and the multiaxial fiber composite constituent, followed by establishing said bond and then removal of said temporary external supports in order to balance the prestressing force in the unidirectional fiber composite elements with an opposite prestressing force applied to the multiaxial fiber composite constituent via bond shear stresses.