Showing papers on "Sandwich panel published in 1985"

Process for making honeycomb sandwich panels

Abstract: A process for making a honeycomb sandwich panel in a single furnace cycle which is particularly applicable to making a glass honeycomb sandwich panel as might be utilized in the construction of a glass mirror substrate. In one embodiment, lengths of glass tubing are sandwiched between glass faceplates. On heating to softening temperature, the faceplates are compressed between rigid plates until they are sealed against the open tube ends. Then the sealed tubes are inflated, or the external gas pressure decreased, so the tubes expand and seal also against each other. At the same time the softened faceplates are pressed against and conform to the shape of the rigid restraining plates. One way to achieve inflation of the tubes is with a gas manifold communicating through a hole in the back faceplate and into each tube. A pressure differential is maintained while the glass is cooled until it becomes rigid.

Sandwich panel and end strips therefor and assembly of such sandwich panels

Abstract: End strips for longitudinal edges of a sandwich panel to be used in facade cladding or in garage or entrance doors, the strips being provided with lugs which extend along the length of webs and each of which is arranged to engage with a lug of complementary shape on the other strip. Each lug is disposed on one side edge of the web with an adjoining flange which is disposed at least in part at an acute angle relative to the web, to co-operate with the adjoining cover plate of the sandwich panel.

Deeply ribbed sandwich panel provided with a surmounting joint for adjacent panels, and a method for its manufacture.

Abstract: The sandwich panel comprises a layer of expanded material which is interposed between two metal sheets and is provided on one of its two longitudinal ends with a rib clad with the corresponding metal sheet and coverable by a bent projecting longitudinal edge of the metal sheet of the adjacent panel. The rib comprises, on that side facing the interior of the panel, a step (8) engageable by the correspondingly bent lip (27) of the projecting edge (7), which covers the rib (6). Moreover, the longitudinal edges of the two sheets (2, 3) are joined together by rigid sections (10, 11) which cover the side edges of the layer of expanded material (4).

Buckling Analysis of FRP‐Faced Anisotropic Cylindrical Sandwich Panel

Abstract: Force‐deformation relations of a cylindrically curved symmetric anisotropic sandwich plate are derived using Castigliano's theorem of minimum complementary energy. With these constitutive relations, the Rayleigh‐Ritz method is applied for the buckling analysis of an FRP‐faced curved sandwich plate under combined axial and bending loads. The buckling load coefficients of a sandwich plate with a typical fiberglass reinforced face sheets are presented by varying the parameters, e.g., aspect ratio, core to face thickness ratio, fiber orientation angle, and bending load coefficient. The results show that: (1) The buckling strength is maximum when the fiber orientation is about 40° with respect to circumferential direction; and (2) the buckling response is very sensitive to the combined effect of low aspect ratio, low radius, and bending load coefficient.

Advanced radiator concepts utilizing honeycomb panel heat pipes (stainless steel)

Abstract: The feasibility of fabricating and processing moderate temperature range heat pipes in a low mass honeycomb sandwich panel configuration for highly efficient radiator fins for the NASA space station was investigated. A variety of honeycomb panel facesheet and core-ribbon wick concepts were evaluated within constraints dictated by existing manufacturing technology and equipment. Concepts evaluated include: type of material, material and panel thicknesses, wick type and manufacturability, liquid and vapor communication among honeycomb cells, and liquid flow return from condenser to evaporator facesheet areas. In addition, the overall performance of the honeycomb panel heat pipe was evaluated analytically.

Sandwich panel, its manufacturing process and apparatus for the implementation of this process

Abstract: The apparatus for the implementation of the process includes two reels supplying sheet-metal strips 1 and 2 subjected to a surface treatment and to a reheating operation at a temperature T1, and a system for unreeling a trellis (mesh) 3 which is immersed into a bath B of solder material at a temperature T2. The alignment of the trellis (mesh) 3 between the two metal sheets 1 and 2 is held tightly and soldered between two cylinders C1 and C2 and then cooled after leaving these cylinders. Application to the production of sandwich panels having a core of metal trellis (mesh) held tightly between two metal sheets metallised over at least one face and capable of being soldered.

Part attachment structure of sandwich panel for vehicle

Abstract: PURPOSE:To eliminate the necessity of holes piercing completely through a sandwich panel and as well to make it possible to arrange a damper member, by disposing a hat-shape reinforcing bracket between the outer and inner panels of the sandwich panel. CONSTITUTION:Both leg piece base end sections 11a, 11b of a reinforcing bracket 11 is spot-welded to the inner surface of an outer panel 3, and the head 8b of a weld bolt 8 having a threaded part inserted in an attaching hole 12 in the upper side section 11c of the bracket 11, for carrying a part attachment bracket 6, is welded beforehand to the upper side section 11c. The threaded section of the weld bolt 8 is exposed to the vehicle compartment side B through a hole 13 in an inner panel 4 which is subjected to an embossing process in the direction opposite to the outer panel 3. Therefore, with the use of a cylindrical spacer 9 and a nut 10 the part attachment bracket 6 may be secured to a dash floor panel 1A.

Bendingstresses in insulatedconcretesandwichpanels

Abstract: Today's high costs demandenergyefficiency in farmconfinement buildings, especiallyin hog and poultry operations. Walls madewithprecastconcretesandwichpanelssatisfywellthe criteriaof energyefficiency,strength, durability; they do not support combustion. The structural design of a concrete sandwich panel is difficult because the two concrete wythes work together only partially. The well-known bending formulae do not apply and recommendations from previous research are scarce and incomplete. This paper presents the results of a number of finite element analyses of concrete sandwich panels subjected to bending. Span length is one of the major variables examined as well as other variables of panel geometry. The finite element results indicate that the effective section modulus of a panel measured as a fraction of the section modulus assuming full composite action is dependentonly on the span length to panel thickness ratio and on the amountof shearcoupling. For shear coupling with truss-type masonry reinforcement the ratio of section moduli may be expressed as 0.182 + 0.0245 L-t~l

Furnace Exposure of Insulated Sandwich Panel Systems

Abstract: Ten lightweight sandwich panel systems with cores of cellular plastics have been subjected to a 10-minute furnace test modelled on AS 1530, Part 4 [1], and their behaviour studied in relation to fi...