Method for stiffening plates intended for the creation of ship walls and comprising laminated composite materials, and resulting plate

Abstract

Disclosed is a method for stiffening plates for ship walls. At least one elongate profile member of laminated composite material and having a transverse cross-section of a predetermined shape over the length thereof is pre-manufactured, the profile member being rigid. Then, a panel including laminated composite materials at least on the surface of at least one of the two main surfaces thereof is used, and the at least one pre-manufactured profile member is assembled and attached together onto one of the main surfaces of the panel. The main surface of the panel receives the profile member including laminated composite material. The profile member has a transverse cross-section with three continuous portions: two flanges having substantially straight cross-sections and interconnected by a web. The flanges and the web in transverse cross-section are supported by separate planes, the plane of the web intersecting the two planes, supporting the flanges, at 90°.

1 - 12 . (canceled) 
     
     
         13 . Method for stiffening plates ( 1 ) intended for the creation of ship walls and comprising laminated composite materials, the laminated composite materials being constituted of stacks of layers of fibres impregnated with resin,
 wherein,   at least one elongate profile member ( 3   a ,  3   b ,  3   c ) made of laminated composite material is pre-manufactured having a transverse cross-section of a predetermined shape over the length thereof, with the pre-manufactured profile member ( 3   a ,  3   b ,  3   c ) and obtained being rigid due to the polymerization of the resin that impregnated the layers of fibres that the profile member comprises, and,   and wherein a panel ( 2 ) is used having two main surfaces and comprising at least on the surface of at least one of its two main surfaces a laminated composite material, with the resin that impregnated the layers of fibres that the panel comprises being polymerized, and   said at least one pre-manufactured profile member ( 3   a ,  3   b ,  3   c ) is assembled and attached together onto one of the main surfaces of said panel ( 2 ), with the main surface of the panel receiving the profile member comprising laminated composite material, and   wherein the pre-manufactured profile member ( 3   a ,  3   b ,  3   c ) has a transverse cross-section of a determined shape that comprises three continuous portions: two flanges ( 7 ,  7 ′) and a web ( 6 ), the two flanges ( 7 ,  7 ′) and the web ( 6 ) being substantially straight in the transverse cross-section of the profile member, the two flanges ( 7 ,  7 ′) being connected together by the web, the web ( 6 ) being connected to the flanges ( 7 ,  7 ′) along its two opposite lateral edges, and   wherein the two flanges ( 7 ,  7 ′) and the web ( 6 ) are longitudinally extended over three separate planes, with the plane over which extends the web ( 6 ) crossing the two separate planes over which extend the flanges ( 7 ,  7 ′), with the two planes over which extend the two flanges ( 7 ,  7 ′) being parallel to each other and crossing the plane over which the web ( 6 ) extends with an angle of about 90°, each flange ( 7 ,  7 ′) having two main surfaces, a main inner surface on the side of the web ( 6 ) and a main outer free surface opposite the preceding one, one of the two flanges ( 7 ,  7 ′) of the pre-manufactured profile member being applied by its main outer free surface on the panel.   
     
     
         14 . Method according to  claim 13 , wherein a pre-manufactured profile member ( 3   b ) is used of which the two flanges ( 7 ′) are of the same lateral side of the web, the transverse cross-section of the profile member ( 3   b ) being U-shaped. 
     
     
         15 . Method according to  claim 14 , wherein in the U-shaped profile member at least one portion of the fibre layers is continuously extended from one flange to the other. 
     
     
         16 . Method according to  claim 14 , wherein a pre-manufactured profile member ( 3   a ) is used of which the two flanges ( 7 ) are astride two lateral edges of the web ( 6 ), the transverse cross-section of the profile member ( 3   a ) being H-shaped, the pre-manufactured H-shaped profile member resulting from the reunion during the manufacture thereof of two U-shaped forms of composite material arranged web-against-web. 
     
     
         17 . Method according to  claim 15 , wherein a pre-manufactured profile member ( 3   a ) is used of which the two flanges ( 7 ) are astride two lateral edges of the web ( 6 ), the transverse cross-section of the profile member ( 3   a ) being H-shaped, the pre-manufactured H-shaped profile member resulting from the reunion during the manufacture thereof of two U-shaped forms of composite material arranged web-against-web. 
     
     
         18 . Method according to  claim 14 , wherein a pre-manufactured profile member ( 3   a ) is used that is tubular, the pre-manufactured tubular profile member resulting from the reunion during the manufacture thereof of two U-shaped forms of composite material arranged lateral end of flange against lateral end of flange. 
     
     
         19 . Method according to  claim 15 , wherein a pre-manufactured profile member ( 3   a ) is used that is tubular, the pre-manufactured tubular profile member resulting from the reunion during the manufacture thereof of two U-shaped forms of composite material arranged lateral end of flange against lateral end of flange. 
     
     
         20 . Method according to  claim 16 , wherein, furthermore, during the pre-manufacturing of the H-shaped or tubular profile member, a complementary layer ( 10 ) is added of complementary fibre layers on the main outer free surface of at least the flange that is not intended to be applied on the panel. 
     
     
         21 . Method according to  claim 17 , wherein, furthermore, during the pre-manufacturing of the H-shaped or tubular profile member, a complementary layer ( 10 ) is added of complementary fibre layers on the main outer free surface of at least the flange that is not intended to be applied on the panel. 
     
     
         22 . Method according to  claim 18 , wherein, furthermore, during the pre-manufacturing of the H-shaped or tubular profile member, a complementary layer ( 10 ) is added of complementary fibre layers on the main outer free surface of at least the flange that is not intended to be applied on the panel. 
     
     
         23 . Method according to  claim 19 , wherein, furthermore, during the pre-manufacturing of the H-shaped or tubular profile member, a complementary layer ( 10 ) is added of complementary fibre layers on the main outer free surface of at least the flange that is not intended to be applied on the panel. 
     
     
         24 . Method according to  claim 13 , wherein, alternatively, a pre-manufactured profile member ( 3   c ) is used of which the traverse cross-section is T-shaped with a single flange ( 7 ) astride one of the two lateral edges of the web ( 6 ) and wherein during the assembly and the fastening to the panel of the pre-manufactured profile member, the lateral free edge of the web ( 6 ) of the pre-manufactured profile member is placed on the main surface of the panel ( 2 ) and the second flange, on the panel ( 2 ) side, is created, by lamination ( 3   d ) of additional layers of fibres extended between the web ( 6 ) and the panel ( 2 ) as well as resin ( 5 ), this for the two lateral sides of the web ( 6 ), in order to obtain a fixed H-shaped profile member with a transverse cross-section. 
     
     
         25 . Method according to  claim 13 , wherein the pre-manufactured profile members ( 3   a ,  3   b ,  3   c ) are fixed to the panels ( 2 ) by at least one of the following techniques: gluing ( 4 ,  5 ) or mechanical clamping, the gluing being carried out with or without adding additional layers of fibres, the mechanical clamping being chosen from screwing, bolting, riveting, the gluing being in particular a vacuum gluing. 
     
     
         26 . Method according to  claim 13 , wherein, for at least one of the two flanges ( 7 ,  7 ′), the main inner surface of the flange comprises towards it free end, in the case of a U-shaped profile member ( 3   b ), or at least one of its two free ends, in the case of an H-shaped or T-shaped profile member ( 3   a ,  3   c ), a return ( 8 ) intended to form a chute ( 9 ) delimited laterally by the web ( 6 ) and the return ( 8 ) and delimited at the bottom by the main inner surface of the flange ( 7 ,  7 ′). 
     
     
         27 . Method according to  claim 13 , wherein layers of oriented fibres are used and between them are crossed the various layers of fibres. 
     
     
         28 . Reinforced plate ( 1 ) for a ship wall comprising laminated composite materials, wherein it is specifically obtained through the method of  claim 13 . 
     
     
         29 . Reinforced plate ( 1 ) for a ship wall comprising laminated composite materials, wherein it is specifically obtained through the method of  claim 16 . 
     
     
         30 . Reinforced plate ( 1 ) for a ship wall comprising laminated composite materials, wherein it is specifically obtained through the method of  claim 20 . 
     
     
         31 . Reinforced plate ( 1 ) for a ship wall comprising laminated composite materials, wherein it is specifically obtained through the method of  claim 24 . 
     
     
         32 . Ship comprising at least one reinforced plate according to  claim 30 , said ship being a surface craft or a semi-submersible or submersible craft.