scispace - formally typeset
Search or ask a question

Showing papers on "Sandwich panel published in 1978"


Patent
18 Dec 1978
TL;DR: In this paper, a foam insulation panel is provided which includes a plurality of standoffs for contacting the inwardly-facing skin of the sandwich panel, arranged in a grid pattern, molded integrally with the rest of the panel, and bonded to the skin.
Abstract: Thermal insulating apparatus for an aircraft fuselage of the type utilizing a sandwich panel construction. A foam insulation panel is provided which includes a plurality of standoffs for contacting the inwardly-facing skin of the sandwich panel. The standoffs may be arranged in a grid pattern, molded integrally with the rest of the panel, and bonded to the skin of the sandwich panel. The insulation panel may be used with or without a trim panel between it and the fuselage compartment, and in either case a sheet of metal foil may be attached to the inside face of the insulation panel. The foam may be of the self-skinning type so as to resist penetration of moisture into the foam panel and help direct condensate away from the fuselage compartment.

46 citations


Patent
21 Aug 1978
TL;DR: In this article, a weather-proof attachment device was proposed to connect sandwich panel wall system modules to concrete floors including a bracket under the wall with an upright rail connected to the inside facia sheet of the sandwich panel and an outside inverted U-shape rail extending into the interior core of the panel, the groove to receive the edge of a protection sheet from below extending from the bracket across the surface of the concrete and over the corner of the slab.
Abstract: A weather proof attachment device to connect sandwich panel wall system modules to concrete floors including a bracket under the wall with an upright rail connected to the inside facia sheet of the sandwich panel and an outside inverted U-shape rail extending into the interior core of the panel, the groove to receive the edge of a protection sheet from below extending from the bracket across the surface of the concrete and over the corner of the slab to prevent weather and rain from entering therein.

33 citations


Patent
15 Sep 1978
TL;DR: In this article, the strand connectors are permitted to solidify to complete the formation of the sandwich panel. But they are driven between the top and bottom skin by a controlled magnetic field.
Abstract: Sandwich panels comprising a top skin and a bottom skin and a connecting core of a plurality of strand connectors are fabricated by applying viscous liquid core material to one of the skins, providing particles with the viscous core material, and reciprocating the particles between the top and bottom skins to form the strand connectors. The strand connectors are permitted to solidify to complete the formation of the sandwich panel. The particles are preferably of a ferrous metal and are driven between the top and bottom skins by a controlled magnetic field. Compound curved and tubular sandwich panels can be formed by the method.

15 citations


01 Apr 1978
TL;DR: In this paper, the upper and lower surface panels of the arrow wing structure were redesigned using high strength graphite/polyimide sandwich panels, retaining the titanium spars and ribs from the prior study.
Abstract: Based on estimated graphite and boron fiber properties, allowable stresses and strains were established for advanced composite materials. Stiffened panel and conventional sandwich panel concepts were designed and analyzed, using graphite/polyimide and boron/polyimide materials. The conventional sandwich panel was elected as the structural concept for the modified wing structure. Upper and lower surface panels of the arrow wing structure were then redesigned, using high strength graphite/polyimide sandwich panels, retaining the titanium spars and ribs from the prior study. The ATLAS integrated analysis and design system was used for stress analysis and automated resizing of surface panels. Flutter analysis of the hybrid structure showed a significant decrease in flutter speed relative to the titanium wing design. The flutter speed was increased to that of the titanium design by selective increase in laminate thickness and by using graphite fibers with properties intermediate between high strength and high modulus values.

7 citations



Book ChapterDOI
TL;DR: A simple analysis procedure is developed to predict graphite/epoxy sandwich panel internal pressures at elevated temperatures, based on moisture characteristics of the panel constituents, prior environmental exposure, and test temperature time histories as mentioned in this paper.
Abstract: A simple analysis procedure is developed to predict graphite/epoxy sandwich panel internal pressures at elevated temperatures, based on moisture characteristics of the panel constituents, prior environmental exposure, andtest temperature time histories. Pressures so predicted are shown to correlate well with measured panel pressure test results. It is further shown that, due to environmental absorbed moisture, internal panel pressures of 65 psig (4.5 kg/cm 2 ) or greater can be produced at 350°F (177°C) in graphite/epoxy sandwich panels with Nomex core. Panel internal pressure test failures at 350°F (177°C) for various initial environmental exposures are also shown to be dependent on the moisture level in the METLBOND 329-7 adhesive at time of failure. Panel failure pressures in excess of 150 psig (10.5 kg/cm 2 ) at 350°F (177°C) are reported for low adhesive moisture levels (room temperature equilibrium relative humidity of 20 percent or less), but as low as 60 psig (4.5 kg/cm 2 ) for high adhesive moisture levels (70 percent relative humidity equilibrium at room temperature). Lap shear and flatwise tension test results of the METLBOND 329-7 adhesive at room temperature and 350°F (177°C) with absorbed moisture are also presented; these tests exhibit similar moisture strength degradation and failure modes as that demonstrated by the panel pressure test specimens.

5 citations




Patent
16 Nov 1978
TL;DR: A self-supporting sandwich panel is formed of a layer of insulating material which is bonded by adhesive or similar between two chipboards as discussed by the authors, which allows the use of lightweight rafters and supports generally.
Abstract: A self-supporting sandwich panel is formed of a layer of insulating material which is bonded by adhesive or similar between two chipboards. On one side of the panel wooden laths are provided, and these for pref. are also fixed on with adhesive. These wooden laths are fitted in the direction of the inclination of the roof. The side edges of the panels aligned to the slope of the roof are provided with ribs and/or grooves. The ribs and/or grooves are formed directly into the insulating material and the two chipboards. At least two opposing side edges of the panel are formed by wooden laths positioned so that the layer or insulating material is enclosed by them and the chipboards. The ribs and/or grooves are formed in the laths positioned in this way. The insulation material is an expanded resin such as polystyrene, polyurethane, etc. The chip boards are proof to boiling, are water tight and proof against mildew. Panel is used for the cladding of walls and partic. of roofs to be titlted or slated. The panel allows the use of lightweight rafters and supports generally. The panels can be made in sizes to support particular application as regards the degree of insulation and their unsupported span. The laths are laid on to suit the inclination of the roof with the tile or slate timbers resting on them so that air can circulate continuously in the space between.

2 citations


Dissertation
01 Jan 1978

2 citations


01 Dec 1978
TL;DR: In this article, a study to experimentally measure the stresses induced in a portable rigid wall shelter by loadings typical of the transportation environment is documented, and several structural failures are presented.
Abstract: : The details of a study to experimentally measure the stresses induced in a portable rigid wall shelter by loadings typical of the transportation environment are documented. In the transportation configuration the shelter measures 6.1 m long x 2.4 m wide x 2.4 m high (20 ft x 8 ft x 8 ft) and is designed to the requirements of the International Organization for Standardization (ISO). In the deployed configuration the width expands to 6.4 m. The primary construction material is an aluminum faced paper honeycomb core sandwich panel. The shelter was instrumented with accelerometers and strain gages and subjected to loadings typical of the ISO and military transportation environment. The strain and acceleration data generated during the tests and details of several structural failures are presented. (Author)



Patent
15 Mar 1978
TL;DR: In this article, a thin walled modular building construction with corner connection on inclined edge faces of sandwich panel framework is described, where corner connections are made on the inclined edge of the sandwich panel.
Abstract: Thin walled modular building construction has corner connection on inclined edge faces of sandwich panel framework

Patent
07 Apr 1978
TL;DR: In this article, the side surfaces of a paper honeycomb are coated with an electron radiation curing coating to produce a high-durable paper-combustion sandwich panel having high durability.
Abstract: PURPOSE:After coated with a cold-setting and electron radiation curing coating, the side surfaces of a paper honeycomb are coated with an electron radiation curing coating to produce a paper honeycomb sandwich panel having high durability.

01 Jan 1978
TL;DR: In this article, the authors compared the mass of a radiative actively cooled structural panel with a bare actively cooled panel designed to the same conditions and constraints, and proposed an approach to design and optimize a 0.61 x 6.1 m full scale panel which combines radiative and active cooling to control structural temperatures to levels compatible with use of lightweight materials.
Abstract: The mass of a radiative actively cooled panel was compared to the mass of a bare actively cooled panel designed to the same conditions and constraints. The approach was to design and optimize a 0.61 x 6.1 m full scale panel which combines radiative and active cooling to control structural temperatures to levels compatible with use of lightweight materials and to fabricate a 0.61 x 1.22 m panel for performance testing. Results of the design and optimization of the full scale radiative actively cooled structural panel, including radiative concept selection, final configuration details, test panel description, and conclusions are summarized.