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 article, the authors analyzed the transverse compression and shear collapse mechanisms of a second order, hierarchical corrugated truss structure and derived the collapse mechanism maps for second order trusses.
Abstract: The transverse compression and shear collapse mechanisms of a second order, hierarchical corrugated truss structure have been analyzed. The two competing collapse modes of a first order corrugated truss are elastic buckling or plastic yielding of the truss members. In second order trusses, elastic buckling and yielding of the larger and smaller struts, shear buckling of the larger struts, and wrinkling of the face sheets of the larger struts have been identified as the six competing modes of failure. Analytical expressions for the compressive and shear collapse strengths in each of these modes are derived and used to construct collapse mechanism maps for second order trusses. The maps are useful for selecting the geometries of second order trusses that maximize the collapse strength for a given mass. The optimization reveals that second order trusses made from structural alloys have significantly higher compressive and shear collapse strengths than their equivalent mass first order counterparts for relative densities less than about 5%. A simple sheet metal folding and dip brazing method of fabrication has been used to manufacture a prototype second order truss with a relative density of about 2%. The experimental investigation confirmed the analytical strength predictions of the second order truss, and demonstrate that its strength is about ten times greater than that of a first order truss of the same relative density. DOI: 10.1115/1.2198243
157 citations
TL;DR: In this article, the perforation of composite sandwich structures subjected to high-velocity impact was analyzed, and the contribution of failure mechanisms to the energy-absorption of the projectile kinetic energy was determined.
157 citations
TL;DR: In this paper, a foam-filled corrugated core sandwich panel was evaluated under quasi-static out-of-plane compression and the underlying mechanisms were numerically studied using finite element simulations.
154 citations
Patent•
30 Dec 1996
TL;DR: In this article, rigid foam pieces or boards and alternating porous fibrous web sheets are adhered to form core panels or billets, which are maintained in the webs for forming integral structural ties by absorbing resin applied under differential pressure to the webs and to overlying sandwich panel skins.
Abstract: Rigid foam pieces or boards and alternating porous fibrous web sheets are adhered to form core panels or billets. Porosity is maintained in the webs for forming integral structural ties by absorbing resin applied under differential pressure to the webs and to overlying sandwich panel skins. Beveled foam recesses adjacent web edge portions form structural resin fillets, and protruding edge portions form expanded connections to the skins. Core panels with intersecting webs form enhanced panels. Boards or core panels and web sheets arranged in inclined stacks form second core panels having webs intersecting panel edges or faces at acute angles. Boards of alternating different physical properties and web sheets are bonded to form reinforced panels having differing interior and exterior densities. Compressible foam panels are used in place of or with web sheets to make bendable core panels. Foam between web edge portions is recessed for bonding a settable material to the edge portions.
152 citations
TL;DR: In this paper, the structural performance of sandwich panels with a carbon fiber pyramidal truss core was investigated for direct (pure) shear and three-point bending in the presence of different failure modes.
151 citations