Accession Number : AD0922976

Title :   Composite Box Beam Optimization. Volume II. Increased Structural Efficiency of Boron/Aluminum.

Descriptive Note : Final technical rept. Dec 72-Mar 74,

Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE NY

Personal Author(s) : Donohue, Peter J. ; Truran, R. ; Borstell, H. ; Golam, G. ; Forsch, H.

Report Date : MAY 1974

Pagination or Media Count : 135

Abstract : The program was undertaken to extend the technology base for highly loaded composite wing box structure through the selective application of the newer advanced composite material systems and minimization of the use of metallic structural elements. The design engineering and manufacturing technology portion of the program demonstrated the high compression strength of boron/aluminum through 350 F and the weight savings of boron/aluminum skinned honeycomb sandwich construction over a titanium baseline design. This volume reports the results of a study to further increase the structural efficiency of boron/aluminum to the 550 F temperature regime. The use and practicality of secondarily retort brazing boron/aluminum faced titanium honeycomb core sandwich construction in overcoming the limitations of its adhesive bonded counterpart was investigated. Various aspects of the basic brazing process including core pretreatment and braze alloy requirements were investigated. Optimal parameters were selected and a preliminary process specification written. The basic properties; the strength of codiffusion braze bonded overlap and integral stepped joints; and the strength of single shear, double row bolted joints of optimally brazed sandwich panels and plain specimens subjected to the selected braze temperature are reported. Pertinent conclusion and recommendations for future study are presented. (Author)

Descriptors :   (*COMPOSITE STRUCTURES, OPTIMIZATION), (*BOX BEAMS, COMPOSITE STRUCTURES), (*COMPOSITE MATERIALS, BOX BEAMS), (*WINGS, COMPOSITE STRUCTURES), BORON, ALUMINUM, LAMINATES, AIRFRAMES, BRAZING, DIFFUSION, BONDED JOINTS, MANUFACTURING, SANDWICH CONSTRUCTION, HONEYCOMB STRUCTURES, DIFFUSION BONDING, SUPERSONIC AIRCRAFT, JET FIGHTERS.

Subject Categories : Attack and Fighter Aircraft
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE