Sheet for Structural Material Core, Core and Structural Material Comprising Such a Sheet

Abstract

Sheet for core of structural material sandwich extending substantially along an extension plane and having an upper surface and a lower surface which are opposite along a thickness direction, where the sheet is provided with a plurality of upper and lower surfaces for bonding near the upper and lower surfaces thereof, where the sheet comprises a three-dimensional network of edges separated by connecting surfaces, where each edge is defined by a nonplanar profiled wall delimited by an upper bonding surface, a lower bonding surface and two parallel straight lines connecting said upper and lower bonding surfaces by following an edge direction, and where each connecting surface is delimited by at least three edges.

1 . As structural material sandwich core sheet extending substantially along an extension plane and having an upper surface and a lower surface which are opposite along a thickness direction perpendicular to the extension plane,
 where the sheet is provided with a plurality of upper surfaces for bonding near the upper surface thereof and also a plurality of lower surfaces for bonding near the lower surface thereof,   the sheet wherein it includes a three dimensional network of edges separated by connecting surfaces,   in that each edge is defined by a non-planar profiled wall delimited by   one upper bonding surface among the plurality of upper bonding surfaces   one lower bonding surface among the plurality of lower bonding surfaces, and   two substantially parallel straight lines connecting said upper bonding surface to said lower bonding surface by following an edge direction,   and in that each connecting surface is delimited by at least three edges and has a barycenter substantially located in the area of the median plane parallel to the extension plane of the sheet and located at the middle of a thickness distance separating the upper and lower surfaces, where said distance is considered along the thickness direction.   
     
     
         2 . The sheet according to  claim 1 , wherein the upper and lower bonding surfaces are distributed periodically. 
     
     
         3 . The sheet according to  claim 1 ,
 wherein the plurality of upper bonding surfaces and the plurality of lower bonding surfaces are arranged staggered in rows in the extension plane.   
     
     
         4 . The sheet according to  claim 1 , wherein each connecting surface is delimited by at least four edges, two lower bonding surfaces and two upper bonding surfaces. 
     
     
         5 . The sheet according to  claim 1 , wherein the connecting surfaces are minimal surfaces. 
     
     
         6 . The sheet according to  claim 1 , wherein the connecting surfaces are minimal surfaces which are segmented or provided with grooves. 
     
     
         7 . The sheet according to  claim 1 , wherein the connecting surfaces are perforated with openings. 
     
     
         8 . The sheet according to  claim 1 , wherein the upper and lower bonding surfaces are identical. 
     
     
         9 . The sheet according to  claim 1 , wherein for at least one edge, the two parallel straight lines delimiting said edge are not coincident. 
     
     
         10 . The sheet according to  claim 1 , wherein each nonplanar profiled wall of edges is constituted uniquely of straight lines connecting said upper bonding surface delimiting it to said lower bonding surface delimiting it. 
     
     
         11 . A core for structural materials sandwich comprising at least one sheet according to  claim 1 . 
     
     
         12 . A structural material sandwich comprising a core according to  claim 11 .