Showing papers on "Sandwich panel published in 1976"

Prefabricated multi-layer steel-reinforced concrete panels

Abstract: A sandwich panel assembly or slab structure has a pair of steel-reinforced concrete plates generally coextensive with one another and a cushion of insulating foamed synthetic resin therebetween. A tubular anchor is located at the center (centroid) of at least a portion of the panel and is embedded in the concrete plates. At least one slightly flexible elongated auxiliary anchor plate or membrane sheet provides additional fixation of the assembly. This membrane is spaced from the tubular anchor and traverses the resin cushion and is embedded in each of the concrete plates. Metal bars extend through and from the membrane and are embedded in the concrete plates.

Method of fixing a sandwich panel to a support

Abstract: Sandwich panels, especially load-bearing panels such as aircraft floors, are fixed to support members by means of ferrules having an aperture sufficient to allow the passage of the shank, but not the head, of a bolt, by a method in which The ferrule is inserted into a hole extending the thickness of the panel so that the body of the ferrule lies within the sandwich panel and the flange contacts a skin of the panel, The flange is bonded to the skin which it contacts, usually by means of a thermosetting or thermoplastic adhesive, The panel is placed against the support member in the desired location with the face of the panel carrying the flange of the ferrule in contact with the support member, and The bolt is passed through the ferrule and screwed to the support member This method allows shorter bolts to be used than was previously possible, resulting in a saving in weight

Analysis of Sandwich Panels with Formed Faces

Abstract: The analysis of foam-filled sandwich panels with light gage, cold-formed metal faces is studied both experimentally and theoretically. Moments and shears affecting the core and those arising from the bending of the rigid faces are combined in the theory. Formulated as an ordinary second order differential equation, and using boundary conditions, expressions are developed for deflection and for flexural stresses in the faces and shear stresses in the core. Experimentally, four different sandwich panels were subjected to uniform loading on simple spans. Strain gages and deflection dials were used. Experimental and theoretical deflections and stresses are in reasonable agreement. Both approaches show a reversal of stresses along the profiles of the formed faces due to bending of such faces about their own centroidal axis, which indicates a plane section of such sandwich panel does not remain plane under bending. The theory is applicable to panels with either one or two formed face(s) and faces of different or the same materials. In case there is only one formed face, the other face is flat.

Playing surface for handball and racquetball courts

Abstract: A playing surface suitable for handball, racquetball and similar games is presented by a composite panel having two structural and functional components comprising a base sandwich panel member for imparting strength and rigidity to the panel construction and a relatively thin, finish panel member having the requisite surface hardness. Each member is composed of prefabricated sections joined during assembly by spline and slot connections, the lines of joinder of the finish panel sections being substantially out of alignment with the joint lines of the base panel sections to increase the strength of the composite panel. The panel construction forms a self-supporting wall and thus may be employed exclusively in the construction of playing courts, or use in conjunction with conventional walls, ceilings and floors as desired.

Stability of Flat, Clamped, Rectangular Sandwich Panels Subjected to Combined Inplane Loadings.

Abstract: : The general stability of flat, rectangular sandwich panels loaded by combined biaxial compression, biaxial edgewise bending and edgewise shear is investigated The analysis is applicable to sandwich structures having isotropic face sheets and orthotropic cores The analysis procedure is based upon a linear potential energy formulation and the Ritz method of discretization For the case of clamped boundaries, it is shown that the equation of the potential energy must be minimized by the use of matrices The analysis leads to an infinite series solution for which the eigenvalues of the equation of matrices are monotonically decreasing This analysis is presented in detail with the equations for the potential energy presented in three Appendices The equation presented in Appendix C is the expression used to minimize the potential energy of a flat, clamped sandwich panel (Author)

Weather proof table tennis table - sandwich panel has perforated board between two metal layers

Abstract: A weatherproof table tennis table comprises two metal plates (3, 4) stuck in either side of a perforated chipboard or plastics panel (2a) which can dissipate the heat and withstand temperature fluctuations.

Analytical structural efficiency studies of borsic/aluminum compression panels

Abstract: Analytically determined mass-strength curves, strain-strength curves, and dimensions are presented for structurally efficient hat-stiffened panels, corrugation-stiffened panels, hat-stiffened honeycomb-core sandwich panels, open-section corrugation panels, and honeycomb-core sandwich panels. The panels were assumed to be fabricated from either titanium, borsic/aluminum, or a combination of these materials. Borsic/aluminum panels and titanium panels reinforced with borsic/aluminum were lighter and stiffer than comparably designed titanium panels. Reinforced titanium panels had the same extensional stiffness as comparably designed Borsic/aluminum panels. For a given load, the structural efficiency of the hat-stiffened honeycomb-core sandwich panel was higher than the structural efficiency of the other stiffened panels.