Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/40—Shaping or impregnating by compression not applied
  • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
  • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
  • B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/06—Fibrous reinforcements only
  • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
  • B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
  • B29C70/24—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least three directions forming a three dimensional structure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
  • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
  • B29C70/543—Fixing the position or configuration of fibrous reinforcements before or during moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D99/00—Subject matter not provided for in other groups of this subclass
  • B29D99/0003—Producing profiled members, e.g. beams
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
  • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
  • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
  • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
  • B32B3/263—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer having non-uniform thickness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
  • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2307/00—Use of elements other than metals as reinforcement
  • B29K2307/04—Carbon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/001—Profiled members, e.g. beams, sections
  • B29L2031/003—Profiled members, e.g. beams, sections having a profiled transverse cross-section
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24174—Structurally defined web or sheet [e.g., overall dimension, etc.] including sheet or component perpendicular to plane of web or sheet
  • Y10T428/24182—Inward from edge of web or sheet

Definitions

• the present patent application relates to the field of the fa b io n d e p e cies e n m ate ri a u x com posites, in particular for aeronautics.
• pre-impregnated plies of resin can be used, or resin transfer methods can be used.
• RTM Resin Transfer Molding
• This technique consists in placing a preform constituted by a ply assembly inside an enclosed mold, in which resin is injected under pressure. This resin thus progresses through the folds, and gradually fills all the gaps available. Once this filling is completed, the temperature of the mold is raised so as to harden the resin.
• T-pieces that is to say pieces comprising two sections 1, 2 substantially perpendicular to each other, as can be seen in FIGS. 1 and 2 below. attached.
• Such parts can be used especially for the manufacture of beams.
• a substantially plane stack A a substantially plane stack A
• two stacks substantially L, B and C the latter two being joined so as to define the foot of the T.
• This resin mass devoid of fibers, is a weak point of the part obtained in fine: it can indeed be at the origin of a delamination of the surrounding folds, and limits the resistance to tensile stresses tending to separate the stacks B and C of the stack A (arrow 5 in FIGS. 1 and 2).
• the first solution is to pre-fill the junction area of the three stacks of a set of fibers held together: this solution, called “nail head" with respect to the shape of the cross section of said junction area , causes many difficulties in the context of an industrial process.
• the added fibers can move during the resin injection, and finally occupy positions that are not optimal with respect to resistance to external forces.
• the second solution is to sew between them the stacks A, B, C in their junction area, as can be seen in Figure 2 (stitches 7).
• This solution has the disadvantage of being able to be implemented only before introduction of the preform constituted by the stacks A, B, C on the RTM mold, the latter comprising in particular two metal cores preventing passage of the needles. sewing at the appropriate places.
• this seaming solution in practice makes it possible to increase only slightly the resistance to tensile stresses tending to separate the stacks B and C from the stack A.
• the present invention is thus particularly intended to provide a method of manufacturing a composite T-piece by resin transfer molding, that it is easily industrial isable and has a resistance improved vis-à-vis efforts to separate the two sides of the T from each other.
• This object of the invention is achieved with a method of manufacturing a T composite part by resin transfer molding, comprising the steps of:
• the orientation of the fibers forming the loops perpendicularly to the fold plane stack, and the passage of these fibers in the parts of the L-shaped stack of folds which are substantially perpendicular to the fold plane stack is that is, in fact in the foot of the T, offers a particularly remarkable resistance with respect to the efforts that tend to pull the L-shaped stacks of the plane stack.
• said flat stack and said L-shaped stacks are assembled prior to the introduction of the preform between the two cores of the molding tool;
• said L-shaped stacks are assembled, introduced between the two cores of the molding tool, and covered with said plane stack;
• first and a second group of loops are formed, the length and inclination of said first group of loops with respect to the direction perpendicular to said plane stack being greater than those of said second group of loops.
• the present invention also relates to a composite part obtained from the aforementioned method.
• FIG. 1 is a cross-sectional view of a composite part of the prior art, as described in the preamble of the present description,
• FIG. 2 is a perspective view of this same piece
• FIG. 3 is a sectional view of a composite part during manufacture with the process of the present invention
• FIG. 4 is a cross-sectional view of this part once manufactured.
• FIG. 5 is a cross-sectional view of another part manufactured with the method according to the invention.
• identical or similar references denote identical or similar members or sets of members.
• the parts of the stack of folds L, B and C which are substantially perpendicular to the stack of folds A, are placed between the two metal cores M1 and M2 of the molding apparatus M.
• fold plane stack A can be assembled to the two stack of L, B and C folds prior to the introduction of the preform thus formed between the two cores M1 and M2.
• these fibers are brought inside the plane stack of folds A from the free face 11 of the latter, the fiber is penetrated inside the respective part 81, 82 of each stack of folds L, B and C, the loop b is made inside this part, then the fiber is removed by the free face 1 1 of the stacking fold plane A, near the entry point of this fiber in this stack.
• the general direction of the fiber, outside the loop B, is substantially perpendicular to the plane stack A, as can be seen in FIG. This operation is repeated as many times as necessary, so as to obtain a plurality of fibers each defining loops b1, b2, b3 formed inside the portions 81 and 82 of the L, B and C stacks. fibers having a general direction substantially perpendicular to the plane stack A.
• This resin will in particular be positioned around the fibers forming the loops b1, b2, b3.
• the molding tool M is subjected to a rise in temperature, allowing the rapid polymerization of this resin.
• the fibers forming the loops b1, b2, b3 make it possible to achieve a very strong reinforcement of the junction zone of the three stackings of folds A, B, C.
• these fibers make it possible to obtain excellent tearing resistance of the L, B and C folds with respect to the stack of A folds.
• these loops can be made with carbon wire, and be spaced at a pitch of 3 mm from each other, penetrating to about fifty millimeters inside the parts 81 and 82 of the Stacking of folds in L, B and C.
• the folds forming the stacks A, B and C may be formed of satin carbon.
• the stack A may comprise for example 20 plies, and the stacks B and C 5 folds each.
• FIG. 5 shows an embodiment in which the junction between the stackings of folds A, B, C is further reinforced compared with the embodiment of FIG. 4.
• a first group of loops b1, b2, b3 and a second group of loops b4, b5 are provided, the length 11 and the inclination a1 of the first group of loops b1, b2, b3 relative to one another. at the perpendicular direction P to the plane stack A being greater than those 12, a2 of the second group of loops b4, b5.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Composite Materials (AREA)
• Textile Engineering (AREA)
• Moulding By Coating Moulds (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47049267

Family Applications (1)

Country Status (8)

Families Citing this family (3)

Family Cites Families (6)

• 2012
  • 2012-07-20 FR FR1257069A patent/FR2993492B1/fr active Active
• 2013
  • 2013-07-12 CA CA2879135A patent/CA2879135A1/fr not_active Abandoned
  • 2013-07-12 RU RU2015105002A patent/RU2015105002A/ru not_active Application Discontinuation
  • 2013-07-12 BR BR112015001202A patent/BR112015001202A2/pt not_active IP Right Cessation
  • 2013-07-12 CN CN201380038575.6A patent/CN104470707A/zh active Pending
  • 2013-07-12 WO PCT/FR2013/051673 patent/WO2014013167A1/fr active Application Filing
  • 2013-07-12 EP EP13744738.9A patent/EP2874799A1/de not_active Withdrawn
• 2015
  • 2015-01-16 US US14/598,546 patent/US20150125654A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events