Showing papers on "Sandwich-structured composite published in 1982"

Survivable satellite bus structural frame

Abstract: A three-sided prism shaped structure including upper and lower graphite/epoxy honeycomb sandwich decks spaced by rectangular graphite/epoxy longerons and braces, all of which are attached by using machined aluminum fittings. A graphite/epoxy sandwich panel and cone assembly is bonded to one side of the structure for mounting a space sextant therein. Aluminum equipment panels are attached to the other two sides. The bus structure is manufactured in accordance with available procedures for fabricating graphite/epoxy composite material which is the primary structural material.

Flexural Bending and Axial Compression of Architectural Sandwich Panels by Combined Finite-Prim-Strip Method

Abstract: In this paper, the flexural and axial compressive behavior of the prefabricated architectural sandwich panels are studied. The sandwich panel is approximated by the finite-prism-strip model. Such method is simple to program and save considerable computing effort than the finite element method. The results are compared with the available analytical solution.

Design, fabrication and test of liquid metal heat-pipe sandwich panels

Abstract: Integral heat-pipe sandwich panels, which synergistically combine the thermal efficiency of heat pipes and the structural efficiency of honeycomb sandwich panel construction, were fabricated and tested. The designs utilize two different wickable honeycomb cores, facesheets with screen mesh sintered to the internal surfaces, and potassium or sodium as the working fluid. Panels were tested by radiant heating, and the results indicate successful heat pipe operation at temperatures of approximately 922 K (1200 F). These panels, in addition to solving potential thermal stress problems in an Airframe-Integrated Scramjet Engine, have potential applications as cold plates for electronic component cooling, as radiators for space platforms, and as low distortion, large area structures.

Pitched roof truss esp. for house - built of sandwich panels with articulated joints later locked at required angles

Abstract: A roof truss or support structure for a pitched roof, esp. of a house, is composed of prefabricated sandwich panels connected together by hinges at their joints and initially assembled flat. They are then bent at these joints to form a parabolic truss structure. More specifically, the hinges are locked in the bent positions to stiffen the truss. In a preferred embodiment, each rectangular sandwich plate is composed of an outer (upper) sheet metal layer, a central thermal insulating layer, esp. of rigid polyurethane foam, and a bottom plate of reinforced concrete, sheet metal, or the like. At the ends hinges are fitted to form the joints. With this arrangement, in numerous variations, trusses can be simply built up.

Graphite-Fiber-Reinforced Glass-Matrix Composite

Abstract: G/GI structural composite material made of graphite fibers embedded in borosilicate glass exhibit excellent strength, fracture toughness, and dimensional stability at elevated temperatures. It is made by passing graphite-fiber yarn through slurry containing suspension of fine glass particles in carrier liquid and winding on drum to produce prepegged uniaxial tape. After drying, tapes are cut into appropriate lengths and laid up in graphite die in desired stacking scheme. Stack is consolidated by hot pressing in furnace.

Analytic Solution for Continuous Sandwich Plates

Abstract: An analytical solution is presented for simply supported continuous sandwich plate over two spans and subjected to transverse loads. The process involves utilizing the force method in conjunction with the principle of superposition. Solutions for simply supported single sandwich plates subjected to transverse loads and edge moments are found first, and then combined to ensure deformation compatibility along the middle support. The effects of transverse shear deformations on the response of continuous plates are found to be substantial, unlike the case of simply supported single plate. Simple expressions are derived for uniform distributed and concentrated loads.

Mechanical Properties of E293/1581 Fiberglass-Epoxy Composite and of Several Adhesive Systems

Abstract: : Mechanical properties have been generated on E293/1581 fiberglass- epoxy composite and several different adhesive systems. Three flat panels of this composite were supplied. Several panels having adhesive joints were also supplied having the E293/E-glass fabric composite laminates bonded; to itself, to steel, and to aluminum honeycomb material. Several types of adhesives, both film and foam adhesives, were used in bonding the single lap joint panels and the composite-honeycomb sandwich panel. Tensile, flexure, and interlaminar shear data were obtained on specimens removed from the flat panels parallel to the warp fabric direction and at room temperature and 280 deg F (138 degrees C). Single lap shear tests were conducted on specimens removed from the adhesively bonded panels. Three point flexure and edgewise compression tests were conducted on specimens removed from the composite-aluminum honeycomb sandwich panel. (Author)