EP0585793A1 - Casque résistant aux chocs - Google Patents

Casque résistant aux chocs Download PDF

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Publication number
EP0585793A1
EP0585793A1 EP93113549A EP93113549A EP0585793A1 EP 0585793 A1 EP0585793 A1 EP 0585793A1 EP 93113549 A EP93113549 A EP 93113549A EP 93113549 A EP93113549 A EP 93113549A EP 0585793 A1 EP0585793 A1 EP 0585793A1
Authority
EP
European Patent Office
Prior art keywords
prepreg
layers
helmet
recited
packets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP93113549A
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German (de)
English (en)
Inventor
Hsin L. c/o Allied-Signal Inc. Li
Dusan C. c/o Allied-Signal Inc. Prevorsek
Ashok c/o Allied-Signal Inc. Bhatnagar
Heh-Won c/o Allied-Signal Inc. Chang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell International Inc
Original Assignee
AlliedSignal Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AlliedSignal Inc filed Critical AlliedSignal Inc
Publication of EP0585793A1 publication Critical patent/EP0585793A1/fr
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/06—Impact-absorbing shells, e.g. of crash helmets
    • A42B3/062—Impact-absorbing shells, e.g. of crash helmets with reinforcing means
    • A42B3/063—Impact-absorbing shells, e.g. of crash helmets with reinforcing means using layered structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H1/00—Personal protection gear
    • F41H1/04—Protection helmets
    • F41H1/08—Protection helmets of plastics; Plastic head-shields
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F41H5/0471—Layered armour containing fibre- or fabric-reinforced layers
    • F41H5/0485—Layered armour containing fibre- or fabric-reinforced layers all the layers being only fibre- or fabric-reinforced layers

Definitions

  • This invention is in the field of multilayered impact resistant composites and articles of manufacture made from such composites.
  • a more preferred dopant of the invention relates to a helmet comprising an impact resistant composite shell.
  • the present invention relates to an impact resistant article of manufacture, such as an helmet, having at least one surface defined by a plurality of points, at least two of said points located in different horizontal planes, said article comprising a plurality of prepreg packets, each comprising at least two pregreg layers wherein said prepreg layers are comprised of a fibrous network in a polymeric matrix such as a woven fabric, non-woven fabric, one or more undirectional fiber networks or a combination thereof and wherein prepreg packets have been precompressed at a temperature and pressure sufficient to bond adjacent surfaces of adjacent layers prior to incorporation in said article.
  • the impact resistant article of this invention exhibits one or more advantages over conventional impact resistant articles are for example improved impact resistance having the same areal density.
  • the "impact resistance" of the article is the resistance to penetration by a designated threat designated the threats include physical objects as for example, a threat, as for example, bullets, fragments, shrapnels and the like, threats also include non-physical objects such as blast from explosion and the like.
  • the impact resistance for designated threats can be expressed by at least three methods: 1.
  • V/50 is the velocity at which 50% of the threats will penetrate the composite while 50% will be stopped by the armor.
  • SEAT Total specific energy absorption
  • SEAT is the kinetic energy of the threat divided by the areal density of the composite. The higher the SEAT value, the better the resistance of the composite to the threat; and 3.
  • areal density corresponds to the weight per unit area of the ballistic resistant armor.
  • the ballistic resistance of which depends mostly on filaments another useful weight characteristic is the fiber areal density of the composite. This term corresponds to the weight of the filament reinforcement per unit area of the composite (AD).
  • the improved impact resistance results from the precompression of the prepreg packets prior to incorporation of the prepreg packets into the article.
  • the improvement in impact resistance is especially apparent when the fibrous network is a woven or non-woven fabric especially against light or ballistic projectiles as for example 2 grain fragments.
  • the present invention is directed to a non-planar composite article as for example a helmet identified in figures 1 and 2 by the numeral 10.
  • Helmet 10 comprises an impact resistant composite shell 12 comprises a plurality of prepreg packets 14.
  • the helmet of the present invention requires at least two prepreg packets 14.
  • the total number of prepreg packets 14 will vary widely depending on the uses of the article. In general, the greater the number of prepreg packet 14 interfaces the lower the penetration resistance of the article. Therefore, where improved impaction resistance is desired, it is desirable to minimize the number of packet interfaces by minimizing the number of prepreg packets 14. This is balanced against the weaknesses at the seams if there are too few layers. Depending upon the materials used, and the amount of protection needed, this balance can be optimized with routine experimentation.
  • Composite shell 10 is preferably made of at least about 5, more preferably from about 5 to about 30 and most preferably from about 5 to 20 prepreg packets 14.
  • prepreg packets 14 Prior to incorporation into the article of this invention, prepreg packets 14 are individually precompressed at a temperature and pressure sufficient to bond the surfaces of adjacent layers to each other.
  • the requirement that the individual prepreg packets 14 are precompressed is critical to the enhanced impact resistance of the article of this invention.
  • the prepreg packets are precompressed at a temperature equal to or less than about 80°C and at a pressure equal to or less than about 40 MPa.
  • Useful precompression temperatures and pressures are preferably from about 20°C to about 70°C and from about 5 MPa to about 40 MPa, respectively, and are most preferably from about 40°C to about 60°C and from about 7 to about 30 MPa, respectively.
  • Helmet 10 maximizes the advantage of having precompressed prepreg packets 14 comprised of prepreg layers 16 form from a fibrous network as for example a woven or non-woven fabric or unidirectional fiber construction, embedded in a polymer matrix. Such a construction results in improved impact resistance. As shown in the figures, in the preferred embodiments of the invention a fabric, especially a woven fabric, is embedded in the matrix. Helmet 10 has a plurality, at least about 2, preferably at least about 5 packets and most preferably about 5 to 20 prepreg packets 14 cut into patterns 22 such as shown in Figures 7 and 8. It is desirable to maximize the number of layers 16 in each packet 14 and minimize the number of packets 14.
  • Pattern 22 contain cuts such as cut 24 which remove excess material to enable pattern 22 to take a three-dimensional shape and have the cut portions having edges 26 which substantially close up to form seams 26 when pattern 22 is formed into a shell 12.
  • the shell 12 is built by a plurality of prepreg packets 14.
  • the seams of adjacent packets 14 are located so as not to overlap.
  • Figures 7 and 8 show two different patterns 22 used to avoid overlapping of seams 26 in two packets 14.
  • FIG. 7 and 8 show a preferred pattern 22 having eight lobes 30, it should be appreciated that the number of lobes 30 can be varied widely depending on a number of factors as for example the shape of the article.
  • Individual lobe 31 shows a schematic illustration of the preferred woven fabric fiber network in adjacent layers 32 and 33 which had been built up to form packet 14 that had been cut into pattern 22.
  • a plurality of patterns 22 can be "laid-up", that is placed upon one another and put into a suitable means to shape it into shell 12. This can be done by a compression type mold or a stamping mold.
  • the helmets can also be molded in an autoclave. The helmets are preferably compression molded onto a suitable mold.
  • molding parameters such as time, temperature and pressure, can vary.
  • a most preferred set of conditions for molding a helmet 10 having a surface area of approximately 1.29 ft2 (0.12 m2) made using extended chain polyethylene fiber is at a pressure of from about 30 to about 90 tons (27,000 Kg to 82,000 Kg), at a temperature of from about 80°C to about 130°C for from about 5 minutes to about 90 minutes and preferably about 10 minutes to about 45 minutes.
  • Fibers for use in the fabrication of layers 16 may vary widely and may be organic or inorganic fibers.
  • fiber is an elongated body, the length dimension of which is much greater than the transverse dimensions of width and thickness. Accordingly, the term fiber includes monofilament fiber, multifilament fiber, ribbon, strip, a plurality of any one of combinations thereof and the like having regular or irregular cross-section.
  • the fibers may be twisted or have zero twist.
  • different fibers and different matrices can be used.
  • any fiber made of a wide range of materials and having a wide range of tensile and other properties may be used in the practice of this invention .
  • Preferred fibers for use in the practice of this invention are those having a tenacity equal to or greater than about 7 grams/denier (g/d), a tensile modulus equal to or greater than about 50 g/d and an energy-to-break equal to or greater than about 30 joules/grams.
  • the tensile properties are determined by an Instron Tensile Tester by pulling the fiber at 10 in (25.4 cm) fiber length, clamped in barrel clamps at 10 in/min (25.4 cm/min).
  • the tenacity of the fiber are equal to or greater than about 15 g/d
  • the tensile modulus is equal to or greater than about 300 g/d
  • the energy-to-break is equal to or greater than about 20 joules/grams.
  • fiber of choice have a tenacity equal to or greater than about 19 g/d
  • the tensile modulus is equal to or greater than about 1300 g/d
  • the energy-to-break is equal to or greater than about 40 joules/grams.
  • the denier of the fiber may vary widely. In general, fiber denier is equal to or less than about 4000. In the preferred embodiments of the invention, fiber denier is from about 10 to about 4000, the more preferred embodiments of the invention fiber denier is from about 10 to about 2600 and in the most preferred embodiments of the invention, fiber denier is from about 10 to about 1300.
  • the fiber may be formed from inorganic or organic materials.
  • Useful inorganic fibers may vary widely. Illustrative of such fibers are glass (S-glass, E-glass, etc) fibers, boron fibers, silicone carbide fibers, graphite fibers and the like.
  • Useful organic fibers may vary widely.
  • useful organic fiber are those composed of thermosetting resins and thermoplastic polymers such as polyesters; polyolefins; polyetheramides; fluoropolymers; polyethers; celluloses; phenolics; polyesteramides; polyurethanes; epoxies; aminoplastics; polysulfones; polyetherketones; polyetherether-ketones; polyesterimides; polyphenylene sulfides; polyether acryl ketones; poly(amideimides); polyimides; aramids (aromatic polyamides), such as poly(2,2,2-trimethyl-hexamethylene terephthalamide) (Kevlar)and the like; aliphatic and cycloaliphatic polyamides, such as polyhexamethylene adipamide (nylon 66), polycaprolactam (nylon 6)and the like; and aliphatic, cycloaliphatic and aromatic polyesters such as poly (1,4-cyclohe
  • liquid crystalline polymers such as lyotropic liquid crystalline polymers which include polypeptides such as poly-benzyl L-glutamate and the like; aromatic polyamides such as poly(1,4-benzamide), poly(4,4'-biphenylene 4,4'-bibenzo amide), poly(1,4-phenylene 4,4'-terephenylene amide), poly(1,4-phenylene 2,6-naphthal amide), and the like; polyoxamides such as those derived from 2,2' dimethyl-4,4'diamino biphenyl, chloro-1,4-phenylene diamine and the like; polyhydrazides such as poly chloroterephthalic hydrazideand the like;poly(amide hydrazides such as poly(terephthaloyl 1,4 amino-benzhydrazide) and those prepared from 4-amino-benzhydrazide, oxalic dihydrazide, terephthal
  • the fiber used to form the fabric are organic fibers.
  • Preferred organic fibers include a polyethylene fiber (preferably of high molecular weight), nylon 6 or nylon 66 fiber (preferably nylon 6 and nylon 66 and more preferably nylon 6), an aramid fiber, polyester fiber, a fiber formed from liquid crystalline polymers such as liquid crystalline copolyester and mixtures thereof.
  • polyethylene fibers and methods for their preparation are known to those of skill in the art.
  • suitable poly (ethylene) fibers and methods for their preparation are described in U. S. Patent Nos. 4,457,985; 4,551,296; 4,137,394; and 4,356,138; German Off. 3,004,699; GB 2051667; and EPA 64,167.
  • Such fibers can be obtained commercially as for example from Allied Signal Inc. under the trade name Spectra® polyethylene fibers.
  • Suitable aramid fibers are those formed principally from aromatic polyamide. Such fibers and their method of preparation are described in U.S. Patent No. 3,671,542. Such fibers as for example poly(phenylene terephthalamide) fibers and poly(metaphenylene isophthalamide) fibers are produced commercially by Dupont Corporation under the trade names Kevlar® 29, 49, 129 and 149 and under the trade name Nomex®, respectively. In the case of liquid crystal copolyesters, suitable fibers are disclosed, for example, in U.S. Patent Nos. 3,975,487; 4,118,372; and 4,161,470.
  • Prepreg layers 16 of the present invention preferably contain from about 5 to about 30 fiber ends per inch (1.57 to 12 fiber ends/cm) and more preferably about 10 to about 20 per inch (2.4 to 9.4 fiber ends/cm).
  • Each layer 16 is preferably from about 0.0001 in. (2.54 x 10 ⁇ 10 cm) to about 0.04 in. (0.1 cm), preferably about 0.0005 in. (0.0013 cm) to about 0.01 in. (0.035 cm), more preferably about 0.0005 in. (0.0012 cm) to about 0.03 in. (0.08 cm) and most preferably 0.0005 (0.0012 cm) to 0.02 in (0.05 cm) thick.
  • Layers having these dimensions are particularly useful when made of extended chain polyethylene having a yarn of about 1200 denier/118 filaments.
  • the areal density is used to indicate the amount of fiber and/or resin per unit area of the prepreg layer. It is determined by the number of yarn strands laid per unit width of prepreg sheet and the amount of resin applied to the yarn. Typically if a 1200 denier/118 filament yarn is laid by 15 ends per inch (6 ends/cm) the yarn areal density in the prepreg sheet would be about 79 grams per square meter.
  • Layers 16 comprise a fiber network (which can have various configurations) embedded or substantially embedded in a polymeric matrix which preferably substantially coats each filament contained in the fiber bundle and packet 14 comprises a plurality of such layers 16.
  • Layers 16 may be formed by any suitable method and fabricated into packet 14 by any such method. For example, a plurality of filaments can be grouped together to form a twisted or untwisted yarn bundles in various alignment.
  • the fibers may be formed as a felt, knitted or woven (plain, basket, satin and crow feet weaves, etc.) into a network, fabricated into non-woven fabric, arranged in parallel uniaxial array, layered, or formed into a woven or nonwoven fabric by any of a variety of conventional techniques and dispersed in the matrix employing any suitable technique as for example melt blending the fibers in a melt of the polymer, solution blending the fibers in a solution of the polymer followed by removal of the solvent and consolidation of the polymer coated fibers, polymerization of monomer in the presence of the fiber and the like and thereafter aligning the layers 16 in the desired arrangement to impregnated a woven or non-woven fabric with the desired polymer matrix material and thereafter form packets 14.
  • any suitable technique as for example melt blending the fibers in a melt of the polymer, solution blending the fibers in a solution of the polymer followed by removal of the solvent and consolidation of the polymer coated fibers, polymerization of monomer in the presence of
  • One such procedure involves aligning the desired number of layers 16 preferably at least two adjacent coplanar prepreg layers 16. Thereafter the aligned layers 16 are molded at a suitable temperature and pressure to form a prepreg packet 14 of the desired thickness.
  • Another suitable procedure is where the fiber network is formed of a plurality of uniaxial layers in which fibers are aligned substantially parallel and undirectionally such as in a prepreg, pultruded sheet and the like which are fabricated into a laminate packet 14 comprised of a plurality of such uniaxial layers in the which polymer forming the matrix coats or substantially coats the filaments of multi-filament fibers and the coated fibers are arranged in a sheet-like array and aligned parallel to another along a common fiber direction.
  • successive uniaxial layers 16 of such coated, unidirectional fibers can be rotated with respect to previous layer 16 to form a laminated fibrous packet 14.
  • An example of such laminate fibrous packet 14 are composites with the second, third, fourth and fifth uniaxial layers 16 are rotated +45°, -45°, 90° and 0°, with respect to the first layer, but not necessarily in that order.
  • Other examples include composites with 0°/90° layout of fibers in adjacent uniaxial layers.
  • the laminated packet 14 composed of the desired number of uniaxial layers 16 can be precomprised at a suitable temperature and pressure to form a packet 14 having a desired thickness.
  • Useful techniques for forming fiber networks embedded in a polymeric matrix for ballistic resistance applications include those variations commonly employed in the preparation of aramid and polyethylene fabrics and unidirectional prepregs and for consolidating same into for ballistic-resistant articles. For example, the techniques described in U.S. Patent Nos.
  • shell 12 is formed of layers of woven or non-woven fabrics and in the more preferred embodiments of the invention are formed of woven fabrics.
  • the method of surface treatment may be chemical, physical or a combination of chemical and physical actions. Examples of purely chemical treatments are used of SO3 or chlorosulfonic acid. Examples of combined chemical and physical treatments are corona discharge treatment or plasma treatment using one of several commonly available machines.
  • the matrix material may vary widely and may be formed of any thermoplastic polymer,thermosetting resin or a mixture thereof. Suitable polymeric matrix materials include those mentioned below for use in the formation of the fibers of layer 12. Useful matrix polymer materials may exhibit relatively high e.g.equal to or less than about 500 psi (3450 kPa) or may exhibit relatively high modulus e.g. greater than about 500 psi ( 3450 k Pa ).
  • a helmet made of a lower modulus matrix material such as one having lower ASTMD-638 tensile modulus such as a modulus of less than about 20,000 psi (138 MPa), preferably less than about 6,000 psi (41 MPa)
  • tensile modulus such as a modulus of less than about 20,000 psi (138 MPa), preferably less than about 6,000 psi (41 MPa)
  • a helmet made of a lower modulus matrix material such as one having lower ASTMD-638 tensile modulus such as a modulus of less than about 20,000 psi (138 MPa), preferably less than about 6,000 psi (41 MPa)
  • a helment made using a matrix polymer having a high tensile modulus matrix material such as black copolymers of conjugated arenes and vinyl aromatic monomers.
  • helmets made using lower modulus materials are not as stiff or rigid as helmets made using high modulus materials, i.e., a tensile modulus greater than 6,000 psi (41 MPa) preferably greater than about 20,000 psi (138 MPa) such as blends of one or more thermoplastic polymers as for example polyurethane and one or more thermosettung resisns such as a vinyl ester.
  • the present invention includes a Composite, and helmet made of a composite, having separate layers made using different matrix materials in the different layers. Higher modulus matrix materials are used to provide rigidity and lower modulus matrix to resist delamination.
  • the composite has one or more of the higher modulus matrix resin containing layers on at least one surface and optionally both outer surfaces.
  • the composite is designed so that there is at least one and preferably at least two prepreg packets having higher modulus matrix material on the outside of the helmet.
  • the matrix material is a relatively high modulus blend of one or more thermoplastic polymers and one or more thermosetting resins.
  • thermoplastic polymer and thermosetting resins may vary widely depending on the desired characteristics of the composite.
  • Useful matrix materials are described in more detail in WO 91/08895 and are preferably a mixture of thermosetting vinyl ester resin and a thermoplastic polyurethane.
  • the matrix material is selected from the group consisting of relatively low modulus elastomeric materials.
  • elastomeric materials and formulation may be utilized in the preferred embodiments of this invention.
  • suitable elastomeric materials for use in the formation of the matrix are those which have their structures, properties, and formulation together with cross-linking procedures summarized in the Encyclopedia of Polymer Science, Volume 5 in the section Elastomers-Synthetic (John Wiley & Sons Inc., 1964)and those which are described in U.S. Patent No.
  • Block copolymers incorporating polyisoprene may be hydrogenated to produce thermoplastic elastomers having saturated hydrocarbon elastomer segments.
  • A is a block from a polyvinyl aromatic monomer
  • B is a block from a conjugated dien elastomer.
  • Many of these polymers are produced commercially by the Shell Chemical Co. and described in the bulletin "Kraton Thermoplastic Rubber", SC-68-81.
  • the volume ratios of resin to fiber may vary. In general, the ratio is equal to about 5 volume % up to about volume % based on the total volume of the resin and fiber. In the preferred embodiments of the invention, the ratio is from about 5 volume % to about 70 volume %, the more preferred embodiments of this invention is from about 10 volume % to about 50 volume % and the most preferred embodiments of this invention is from about 15 volume % to about 40 volume %.
  • Composites made using packets 14 are made using the above-described packets 14.
  • One technique for forming a composite includes the steps of arranging the desired number of prepreg layers 16 and precompressing them to form a packet 14 having at least precompressed 2 layers, and preferably from 2 to about 500 layers, more preferably 40 to 150 precompressed layers and most preferably 60 to 120 precompressed layers.
  • the composite is made by laying up the desired number of packets 14 to form a precomposite, after which the precomposite is heated under pressure to cause the matrix material to flow and occupy any void spaces to form the composite.
  • Suitable means include compression molding, stamping, or heating under pressure within an autoclave. In the above cases, it is possible that the matrix can be caused to stick or flow without completely melting.
  • the matrix material In general, if the matrix material is caused to melt, relatively little pressure is required to form the composite; while if the matrix material is only heated to a sticking point, generally more pressure is required. Also, the pressure and time to set the composite and to achieve optimal properties will generally depend on the nature of the matrix material (chemical composition as well as molecular weight) and processing temperature.
  • the non-planar penetration resistant article of this invention has many uses.
  • the article can be a protective helment as for example a military helment, a motorcycle helmet and the like.
  • the article can be other non-planar articles such as a radar dome for aircraft, and penetration resistant parts for airplanes, helicopters and military vehicles.
  • FIG. 1 illustrates the procedures for fabrication of a military helmet using modified PASGT type mold of medium size.
  • the standard PASGT mold of medium size has a wall thickness of 0.345" (0.88 cm), which was modified and enlarged to a wall thickness of 0.40" (1 cm) to accommodate a shell weight of 2.55 lbs. (1.16 Kg).
  • Figs. 1 and 2 show the general view of this type of helmet shell.
  • the helmet shell was made from 36 resin coated Spectra®-900 fabric layers.
  • Spectra®-900 fabric is woven from Spectra® yarn which is extended chain polyethylene yarn produced by Allied-Signal Inc.
  • Spectra®-900 yarn has a tenacity of approximately 29 gms/denier, a modulus of approximately 1250 grams/denier, and an energy to break of approximately 55 Joules/denier, a yarn denier of approximately 1200/118 filaments and an individual denier per filament of 10.
  • Two types of Spectra® fabric were prepared: S-904 and S-903. Styles S-904 and S-904 are both woven from Spectra®-900 yarns, however, S-903 was a tighter woven fabric with 7 oz/sq.
  • Style S-904 fabric 82% by weight, was corona treated and coated with, 18%, uncured thermoset vinylester resin. The corona treatment improved the interfacial adhesion between Spectra® fabric and vinylester resin. Vinylester resin was chosen becaue of its hardness which was suitable for exterior surfaces of the shell to prevent possible denting due to impact. Style S-903 fabric was coated first with uncured thermoset vinylester and subsequently with thermoplastic urethane.
  • the weight ratio of fabric/vinylester/urethane was 80/10/10 and this double coated fabric was suitable for interior uses because urethane is an adhesive material and the adding of urethane will also improve the ballistic impact due to its elastic behavior.
  • All of these resin coated fabric were cut into 21" (53 cm) x 21" (53 cm) squares with the exception of two 12" diameter (305 cm) circular crown patches. The crown patch was used to compensate any thickness variations introduced during stamping of the 6-lobes configuration.
  • the novel feature of this invention is to pre-compress numerous resin coated fabric layers (21" (53 cm) x 21" (53 cm) squares), for instance 6 layers, together to form a ply under a pressure of 130 tons/sq. ft.
  • V/50 was 4,249 ft/sec (1,295 m/sec). V/50 is the velocity at which at least 50% of the fragments are stopped by the target.
  • SEAT total specific energy absorption
  • Example 1 was repeated with the exception that, instead of precompression of numberous layers into plies, the shell was fabricated from 36 single resin coated fabric layers as shown in the table of Example 1.
  • the shell weight was 2.56 lbs. (1.16 kg) and the measured V/50 and computed (SEAT) are 4,084 ft/sec (1,245 m/sec) fps and 10.3 Joule-sq. meter/kg., respectively.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Reinforced Plastic Materials (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Moulding By Coating Moulds (AREA)
  • Laminated Bodies (AREA)
EP93113549A 1992-09-01 1993-08-25 Casque résistant aux chocs Withdrawn EP0585793A1 (fr)

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Application Number Priority Date Filing Date Title
US93811792A 1992-09-01 1992-09-01
US938117 1992-09-01

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999061862A3 (fr) * 1998-04-15 2000-03-09 Du Pont Panneaux composites de protection contre des balles de fusil
WO2000029468A1 (fr) * 1998-11-16 2000-05-25 Dsm N.V. Composite de polyurethane
US6526862B1 (en) * 1999-03-12 2003-03-04 Simula, Inc. Fabric armor
US6705197B1 (en) * 2001-05-02 2004-03-16 Murray L. Neal Lightweight fabric based body armor
WO2005054774A1 (fr) * 2003-12-03 2005-06-16 Anjani Technoplast Limited Procede de fabrication d'un panneau de vetement pare-balles dur, et nouveau panneau de vetement pare-balles dur
WO2007097780A2 (fr) * 2005-08-26 2007-08-30 Honeywell International Inc. Composites balistiques flexibles résistants a la prise de liquides, leur procédé de fabrication et articles réalisés a partir de ces composites
WO2008063682A1 (fr) * 2006-02-18 2008-05-29 Honeywell International Inc. Procédé de production de produits balistiques améliorés
EP2629044A1 (fr) 2012-02-20 2013-08-21 Teijin Aramid B.V. Article pare-balles, produit semi-fini et procédé de fabrication d'une coque pour un article pare-balles
CN113349501A (zh) * 2021-05-17 2021-09-07 江西联创电声有限公司 一种头盔及其制备方法

Citations (5)

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Publication number Priority date Publication date Assignee Title
US4309487A (en) * 1968-08-23 1982-01-05 Phillips Petroleum Co. Laminated armor
US4613535A (en) * 1985-02-28 1986-09-23 Allied Corporation Complex composite article having improved impact resistance
US4748064A (en) * 1985-01-14 1988-05-31 Allied Corporation Ballistic-resistant composite article
US4953234A (en) * 1987-08-03 1990-09-04 Allied-Signal Inc. Impact resistant helmet
US5112667A (en) * 1987-08-03 1992-05-12 Allied-Signal Inc. Impact resistant helmet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309487A (en) * 1968-08-23 1982-01-05 Phillips Petroleum Co. Laminated armor
US4748064A (en) * 1985-01-14 1988-05-31 Allied Corporation Ballistic-resistant composite article
US4613535A (en) * 1985-02-28 1986-09-23 Allied Corporation Complex composite article having improved impact resistance
US4953234A (en) * 1987-08-03 1990-09-04 Allied-Signal Inc. Impact resistant helmet
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WO1999061862A3 (fr) * 1998-04-15 2000-03-09 Du Pont Panneaux composites de protection contre des balles de fusil
WO2000029468A1 (fr) * 1998-11-16 2000-05-25 Dsm N.V. Composite de polyurethane
US6526862B1 (en) * 1999-03-12 2003-03-04 Simula, Inc. Fabric armor
US6705197B1 (en) * 2001-05-02 2004-03-16 Murray L. Neal Lightweight fabric based body armor
WO2005054774A1 (fr) * 2003-12-03 2005-06-16 Anjani Technoplast Limited Procede de fabrication d'un panneau de vetement pare-balles dur, et nouveau panneau de vetement pare-balles dur
JP2009505865A (ja) * 2005-08-26 2009-02-12 ハネウェル・インターナショナル・インコーポレーテッド 液体吸収に対して抵抗性である可撓性防弾性複合材料、その製造方法、およびそれから製造された物品
US7687412B2 (en) 2005-08-26 2010-03-30 Honeywell International Inc. Flexible ballistic composites resistant to liquid pick-up method for manufacture and articles made therefrom
WO2007097780A3 (fr) * 2005-08-26 2007-11-08 Honeywell Internation Inc Composites balistiques flexibles résistants a la prise de liquides, leur procédé de fabrication et articles réalisés a partir de ces composites
WO2007097780A2 (fr) * 2005-08-26 2007-08-30 Honeywell International Inc. Composites balistiques flexibles résistants a la prise de liquides, leur procédé de fabrication et articles réalisés a partir de ces composites
CN101356054B (zh) * 2005-08-26 2013-06-19 霍尼韦尔国际公司 防吸液性柔性防弹材料及其生产方法以及由此制造的产品
US9562749B2 (en) 2006-02-18 2017-02-07 Honeywell International Inc. Method of making improved ballistic products
JP2009527717A (ja) * 2006-02-18 2009-07-30 ハネウェル・インターナショナル・インコーポレーテッド 改善された防弾製品を製造する方法
US8673198B2 (en) 2006-02-18 2014-03-18 Honeywell International Inc Method of making improved ballistic products
WO2008063682A1 (fr) * 2006-02-18 2008-05-29 Honeywell International Inc. Procédé de production de produits balistiques améliorés
EP2629044A1 (fr) 2012-02-20 2013-08-21 Teijin Aramid B.V. Article pare-balles, produit semi-fini et procédé de fabrication d'une coque pour un article pare-balles
WO2013124233A1 (fr) 2012-02-20 2013-08-29 Teijin Aramid B.V. Article résistant aux balles, produit semi-fini pour une coque pour un article résistant aux balles et procédé de fabrication de cette dernière
US10066904B2 (en) 2012-02-20 2018-09-04 Teijin Aramid B.V. Ballistic resistant article, semi-finished product for and method of making a shell for a ballistic resistant article
CN113349501A (zh) * 2021-05-17 2021-09-07 江西联创电声有限公司 一种头盔及其制备方法
CN113349501B (zh) * 2021-05-17 2022-06-14 江西联创电声有限公司 一种头盔及其制备方法

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