Showing papers on "Sandwich panel published in 1979"

Multiwall thermal protection system

Abstract: Multiwall insulating sandwich panels are provided for thermal protection of hypervelocity vehicles and other enclosures. In one embodiment of the invention the multiwall panels are formed of alternate layers of dimpled and flat metal (titanium alloy) foil sheets and beaded scarfed edge seals to provide enclosure thermal protection up to 1000° F. An additional embodiment employs an intermediate fibrous insulation for the sandwich panel to provide thermal protection up to 2000° F. and a third embodiment employs a silicide coated columbium waffle as the outer panel skin and fibrous layered intermediate protection for thermal environment protection up to 2500° F. The use of multiple panels of the present invention on an enclosure facilitate repair and refurbishment of the thermal protection system due to the simple support provided by the tab and clip attachment for the panels.

Method of manufacturing double layer attenuation panel with two layers of linear type material

Abstract: A method of manufacturing a double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure comprising an impervious facing of thin sheet material, a first honeycomb core with end wise directed cells, a first perforate facing of thin sheet material, a first thin layer of porous fibrous material, a second perforated facing of thin sheet material, a second honeycomb core with end wise directed cells, a third perforate facing of thin sheet material, the second perforated facing sheet having substantially larger perforations than the first and third sheets, and a second layer of porous fibrous material. The resulting sandwich panel has a pre-determined flow through resistance between the outer surface of the first and second layers of porous fibrous material and the cells of the first and second honeycomb cores. The cells of the first and second honeycomb cores may be of equal or different volume and may be constructed of similar or dissimilar materials.

Double layer attenuation panel with two layers of linear type material

Abstract: A double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure comprising an impervious facing of thin sheet material, a first honeycomb core with end wise directed cells, a first perforate facing of thin sheet material, a first thin layer of porous fibrous material, a second perforated facing of thin sheet material, a second honeycomb core with end wise directed cells, a third perforate facing of thin sheet material, the second perforated facing sheet having substantially larger perforations than the first and third sheets, and a second layer of porous fibrous material. The resulting sandwich panel has a pre-determined flow through resistance between the outer surface of the first and second layers of porous fibrous material and the cells of the first and second honeycomb cores. The cells of the first and second honeycomb cores may be of equal or different volume and may be constructed of similar or dis-similar materials.

Double layer attenuation panel

Abstract: A double degree acoustic attenuation sandwich panel having a plurality of stacked components adhered together to form a unitary sandwich structure. The structure comprising an impervious facing of thin sheet material, a first honeycomb core with end wise directed cells, a first perforate facing of thin sheet material, a first thin layer of porous fibrous material, a second honeycomb core with end wise directed cells, a second perforate facing of thin sheet material and a second layer of porous fibrous material. The resulting sandwich panel has a predetermined flow through resistance between the outer surface of the first and second layers of porous fibrous material and the cells of the first and second honeycomb cores. The cell of the first and second honeycomb cores may be of equal or different volume cells and may be constructed of similar or dissimilar materials.

Panel for walls, doors and the like

Abstract: A panel element for walls, doors and the like with transparent areas (3) comprises a sandwich panel consisting of a transparent or translucent core made of plastic, such as, for example, acrylic or polycarbonate glass, and a covering with metal sheet or foil (2) on both sides. In order also to obtain windows or similar transparent or translucent areas (3) in this panel element, this covering, which expediently consists of aluminium, is cut out in these areas.

Aluminium-polyurethane foam-aluminium sandwich panel - has foam core comprising alternating hard and soft sections

Abstract: Multi-ply laminate of sandwich construction esp. Al-sheet/polyurethane foam/Al-sheet is made in situ in that the foam coare is formed between the outer plies in such a way that there are spaced strips of comparatively harder polyurethane foam between which there are softer polyurethane foam strips i.e. harder and softer strips alternate. Mfr. comprises applying partition-like delimiters onto the lower Al-sheet within which a harder-setting, non-flowing, pre-expanded foam is introduced. The spaces between the resulting foam strips is filled with softer-setting liq. foam. Both foams expand at the same foaming pressure so that expansion occurs only in upward direction. The prod. is used in aircraft and motor lorry body construction.

Aerothermal performance of radiatively and actively cooled panel at Mach 6.6

Abstract: A flight-weight radiative and actively cooled honeycomb sandwich panel (RACP) was subjected to multiple cycles of both radiant and aerothermal heating. The 0.61 m by 1.22 m test specimen incorporated essential features of a full scale 0.61 m by 6.10 m RACP designed to withstand a heat flux of 136 kW/sq m. The panel consisted of heat shields, a thin layer of high temperature insulation, and an aluminum honeycomb sandwich panel with coolant tubes next to the sandwich skin. A 60/40 mass solution of ethylene glycol/water was used to cool the panel which successfully withstood a total of 3.5 hr of radiant heating and 137 sec exposure to an M = 6.6 test stream. Heat shield temperatures reached 1080 K (1945 deg R), and cooled-panel temperatures reached 382 K (687 deg R) midway between coolant tubes. Simulation of the full scale panel indicated that the full scale RACP would perform as expected. The tests revealed no evidence of coolant leakage or hot gas ingress which would seriously degrade the RACP performance.

Lateral deflection of a sandwich-panel building model under combined loading

Abstract: The behavior of a half-scale panelized building model subjected to, lateral and vertical loads has been analyzed both experimentally and theoretically. The model wa made up of 2-in.-thick sandwich panels with styrofoam core and .025-in.-thick aluminum facings stapled together with aluminum extrusions. Comparisons of the results with the design wind and seismic loads of the Uniform Building Code shows the reliable structural performance of this type of structural system.

Nonlinear Elastic Analysis of Panelized Shear Sandwich Walls

Abstract: Light-weight sandwich panel assemblies can be prefabricated, mass-produced, easily transported, and effectively erected with a small crew and no crane. A one-half scale, six-story building model made up of 2-in. (51-mm) thick aluminum sandwich panels and stapled connections resisted lateral loads of up to 83.3 psf (4,000 kN/m²) representing reference wind speeds of over 93 mph (150 km/hr). An analytical approach has been developed to predict deflections and stresses of panelized building structures having friction-variable shear connections that give rise to nonlinear behavior of the structure. Theoretical and experimental results compared within an average of 6% and a maximum of 13%.

Light fireproof insulated composite load-bearing sandwich panel - has mineral fibre strip layer covering frame and holding one covering layer

Abstract: The statically loadable lightweight structural element for walls, floors or ceilings affords a high degree of fire resistance and heat and sound insulation. It comprises a load-bearing frame filled and sealed with a structure of composite mineral fibre panels. Only oen covering layer(3) of the composite panel is attached to the frame(5). The mineral-fibre-lamellae layer(1) is thicker(6) than the frame structure, so as to cover it completely. The other covering layer(4) is held solely by the mineral fibre lamellae, the frame structure being thus completely embedded in the heat-insulating layer made from these lamellae, and invisible from outside. The fixed covering layer is pref. on the side exposed to the higher temperature. This combines effective fireproofing, heat and sound insulation, and rigidity under one-sided heat or moisture subjection, with light weight.

Lightweight stabilising roof sandwich panel - has thick light central layer rigidly joined to thin outside panels

Abstract: The stabilising roof sandwich panel is made up from two spaced apart strong thin panels (8) with an intervening thicker layer (9) of cohesive light material, such as foam or perlite. The intervening layer (9) is connected to both panels with shear strength effect, to make a cohesive bendable unit. On two opposite sides, on the line of roof slope, panels incorporate a carrier, with an upright stem piece along the thick layer and flanges along top and bottom.

The structural behavior of a graphite-polymide honeycomb sandwich panel with quasi-isotropic face sheets and an orthotropic core

Abstract: The results of a series of tests of graphite-polyimide honeycomb sandwich panels are presented. The panels were 1.22 m long, 0.508 m wide, and approximately 13.3 m thick. The face sheets were a T-300/PMR-15 fabric in a quasi-isotropic layup and were 0.279 mm thick. The core was Hexcel HRH 327-3/16 - 4.0 glass reinforced polyimide honeycomb, 12.7 mm thick. Three panels were used in the test: one was cut into smaller pieces for testing as beam, compression, and shear specimens; a second panel was used for plate bending tests; the third panel was used for in-plane stability tests. Presented are the experimental results of four point bending tests, short block compression tests, core transverse shear modulus, three point bending tests, vibration tests, plate bending tests, and panel stability tests. The results of the first three tests are used to predict the results of some of the other tests. The predictions and experimental results are compared, and the agreement is quite good.