초록 ▼

The present invention is a method for joining thermoplastic composite sandwich panels with thermoplastic welds (fusion bonds) made without autoclave processing of the joint. The preferred joint is a double interleaf staggered joint with supporting titanium doublers providing a tensile strength of at

The present invention is a method for joining thermoplastic composite sandwich panels with thermoplastic welds (fusion bonds) made without autoclave processing of the joint. The preferred joint is a double interleaf staggered joint with supporting titanium doublers providing a tensile strength of at least 12,000 lb/in. The joint is particularly suited for joining sections of a cryogenic tank for spacecraft.

대표청구항 ▼

[ We claim:] [1.]1. A method for making a thermoplastic fusion weld joint in thermoplastic composite, honeycomb core sandwich structure without autoclave processing during formation of the joint, comprising the steps of:(a) laying up upper and lower, left and right laminated face sheets having a plu

[ We claim:] [1.]1. A method for making a thermoplastic fusion weld joint in thermoplastic composite, honeycomb core sandwich structure without autoclave processing during formation of the joint, comprising the steps of:(a) laying up upper and lower, left and right laminated face sheets having a plurality of plies of fiber-reinforced thermoplastic matrix resin;(b) positioning separator plies along edges of the face sheets to define fingers that will overlap and interleaf and that will form the joint to create an interleaf split of fiber-reinforced laminated composite fingers adapted for forming a double staggered interleaf joint;(c) consolidating the face sheets to produce composites substantially free of volatiles or porosity with consolidated fingers along the edges where the joint will be made;(d) bonding the upper and lower face sheets, respectively, to a honeycomb core with a resin rich layer on the surface of the face sheet that contacts the honeycomb core to form the left and right honeycomb core sandwich structure;(e) removing the separator plies;(f) interleaving respective fingers of the left and right face sheets above and below the core to define double staggered interleaf joints;(g) optionally, positioning a metal foil between the core and each face sheet beneath the fingers in the region of the joint to reinforce the joint; and(h) melting and mixing the resin between fingers in the joints to form thermoplastic fusion welds and to complete double staggered interleaf joints above and below the honeycomb core.