Topic
Sandwich panel
About: Sandwich panel is a research topic. Over the lifetime, 4665 publications have been published within this topic receiving 49812 citations.
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TL;DR: In this paper, lateral load tests were performed on four full-scale precast concrete sandwich wall panels and the degree of composite action developed by each shear transfer mechanism (regions of solid concrete, wythe connectors and bond) was evaluated by testing three additional panels that included only one mechanism each.
Abstract: Lateral load tests were performed on four full-scale precast concrete sandwich wall panels. The first panel was a typical precast, prestressed concrete sandwich panel that had shear transfer provided by regions of solid concrete in the insulation wythe, metal wythe connectors (M-ties), and bond between the concrete wythes and the insulation wythe. The degree of composite action developed by each shear transfer mechanism (regions of solid concrete, wythe connectors, and bond) was then evaluated by testing three additional panels that included only one mechanism each. The panels were tested in a horizontal position with simple supports under the action of a uniform lateral pressure. It was found that, for the panel geometries and materials treated in this study, the solid concrete regions provide most of the strength and stiffness that contribute to composite behavior. Steel M-tie connectors and bond between the insulation and concrete contribute relatively little to composite behavior. For design purposes, it is recommended that solid concrete regions be proportioned to provide all of the required composite action in a precast sandwich wall panel.
91 citations
TL;DR: In this article, a review assessing the relative benefits of metal foam core sandwich panels with respect to honeycomb, polymeric foam and truss cores has been conducted, and it is noted that metal foams are able to combine low density with good bending stiffness and strength, making them attractive core materials for use in industrial applications.
Abstract: A review assessing the relative benefits of metal foam core sandwich panels with respect to honeycomb, polymeric foam and truss cores has been conducted. It is noted that metal foams are able to combine low density with good bending stiffness and strength, making them attractive core materials for use in industrial applications (e.g. aircraft wing structures). The current modelling tools available for metal foams are also reviewed. These fall under three categories: analytical methods using dimensional analysis, finite element methods utilising a repeating unit cell, and finite element methods utilising the random Voronoi technique. It is noted that analytical methods do not take into account the effect of imperfections in the microstructure. Finite element methods utilising a repeating unit cell also fail to capture the natural variations in microstructure that are observed in most cellular materials. The effects of imperfections are discussed, and it is observed that these reduce the hydrostatic...
91 citations
TL;DR: In this paper, the authors investigate the effect of impact damage on failure mechanisms in a foam-cored sandwich panel with composite face sheets and show that residual dent growth inwards toward the midplane of a sandwich panel followed by complete separation of the face sheet is the failure mode.
Abstract: Compression-after-impact (CAI) strength of foam-cored sandwich panels with composite face sheets is investigated experimentally. The low-velocity impact by a semi-spherical (blunt) projectile is considered, producing a damage mainly in a form of core crushing accompanied by a permanent indentation (residual dent) in the face sheet. Instrumentation of the panels by strain gauges and digital speckle photography analysis are used to study the effect of damage on failure mechanisms in the panel. Residual dent growth inwards toward the mid-plane of a sandwich panel followed by a complete separation of the face sheet is identified as the failure mode. CAI strength of sandwich panels is shown to decrease with increasing impact damage size. Destructive sectioning of sandwich panels is used to characterise damage parameters and morphology for implementation in a finite element model. The finite element model that accounts for relevant details of impact damage morphology is developed and proposed for failure analysis and CAI strength predictions of damaged panels demonstrating a good correlation with experimental results.
91 citations
Patent•
25 Oct 1993
TL;DR: In this article, a foldable composite panel consisting of an inner layer formed from a first material having a relatively high plasticity at least in compression, bonded to at least one adjacent outer layer forming from a second material having relatively low plasticity is presented.
Abstract: A foldable composite panel (1) comprising an inner layer (2) formed from a first material having a relatively high plasticity at least in compression, bonded to at least one adjacent outer layer (3) formed from a second material having a relatively low plasticity. The composite panel (1) can be permanently folded without failure at ambient temperature through an angle substantially greater than that through which the outer layer (3) alone could be folded without failure under comparable conditions.
91 citations
TL;DR: In this paper, a two-level optimization strategy is proposed for the optimal design of a sandwich panel, where at the first level the optimal geometry of the unit cell of the core together with the material and geometric parameters of the laminated skins are determined, and at the second level a skeleton is laid-up according to the geometrical and material parameters.
90 citations