Car face wall architecture for a car such as a train car made from sandwich composite material

Abstract

A car belonging to a rolling vehicle, characterized in that it includes sidewalls in the form of a single piece made from composite material including a sandwich structure provided with a first skin on the outside of the car, a second skin on the inside of the car and a closed-cell foam or honeycomb core between the skins, the walls being provided with window openings formed by interruptions in the drapes of longitudinal fibres, transverse fibres and intersecting diagonal fibres, the openings having a polygonal shape that reduces the surface area of interrupted diagonal fibres in the corners of the openings.

What is claimed is: 
     
         1 . A rolling vehicle car comprising lateral walls each in a single piece formed by a sandwich composite panel made of a single part provided with a first skin on the outer side of the car, a second skin on the inner side of the car, and a closed-cell foam or honeycomb core between said skins, said walls being provided with window openings formed by interruptions of draping of longitudinal fibers, transverse fibers and crossed diagonal fibers forming said skins, said openings having a polygonal form which reduces the surface of diagonal fibers interrupted in the corners of the openings, said walls forming the faces of the car. 
     
     
         2 . The car as claimed in  claim 1 , wherein the openings have a generally hexagonal or octagonal form comprising two large horizontal sides connected by convex lateral borders. 
     
     
         3 . The car as claimed in  claim 1 , wherein the openings are equipped with a reinforcement border provided with a tubular frame. 
     
     
         4 . The car as claimed in  claim 3 , wherein the reinforcement border comprises an inner wing for securing of the border on the edge of the opening on the inner side of the wall. 
     
     
         5 . The car as claimed in  claim 4 , wherein the tubular frame has a rectangular cross-section, with the inner wing extending a face of the tubular frame on the interior of the wall. 
     
     
         6 . The car as claimed in  claim 5 , wherein the inner wing is secured on the interior of the wall by means of screws, rivets or other securing means. 
     
     
         7 . The car as claimed in  claim 3 , wherein a face of the tubular frame which faces towards the interior of the car is secured by means of screws, rivets or other securing means on a rim of the opening formed by the second skin projecting from the core of the wall. 
     
     
         8 . The car as claimed in  claim 3 , wherein the reinforcement border comprises an inner collar which receives a fastening of a window. 
     
     
         9 . The car as claimed in  claim 1 , wherein at least one of the two skins of the sandwich structure is produced by means of plies oriented in four preferred directions, i.e. 0° (longitudinal axis of the body), 90°, +45° and −45°. 
     
     
         10 . The car as claimed in  claim 9 , wherein the plies are plies impregnated with unit gsm substance of between 125 g/m 2  and 500 g/m 2 . 
     
     
         11 . The car as claimed in  claim 1 , wherein the angle segments of said openings are inclined between 45° and 60° relative to a longitudinal direction of the wall, and are preferably inclined between 45° and 50° relative to a longitudinal direction of the wall. 
     
     
         12 . The car as claimed in  claim 9 , wherein the threads at 45° are in the form of at least two ±45° plies made of carbon fiber. 
     
     
         13 . The car as claimed in  claim 1 , wherein the core of the sandwich is made of material selected from amongst polyethylene terephthalate, polymethacrylimide polyetherimide, an aluminum honeycomb or a poly(m-phenyleneisophthalamide) honeycomb (structure impregnated with phenolic resin).