167results about How to "High damage tolerance" patented technology

A two-dimensional, high-density, damage-tolerant printed code suitable for encoding multiple biometrics and text for positive off-line identity verification comprises a horizontal header section; a vertical header section; a start pattern; a left row address pattern; an encoded data portion; a right two address pattern; and stop pattern. The horizontal header section encodes the number of bit areas in a transverse row of the encoded data portion; and the vertical header section encodes the vertical height of each bit area. The start and stop patterns of the code demarcate the lateral extent of the code (i.e., the beginning and end) from the adjacent quiet zone. Information is encoded into the ended information portion in bit areas that may be printed or blank. The information is encoded sequentially in the information portion from the top of the encoded information portion along each transverse row of bit areas to the next row of bit areas until the end of the encoded information portion. Error correction is applied to subunits of information from the encoded information portion by dividing the user messages and applying error correction to subunits of the user message. The two-dimensional, high-density, damage-tolerant printed code is suitable for printed on a conventionally sized ISO cord or other papers used in verifying identity. An ISO-sized cord or other identity paper bearing a two-dimensional, high-density, damage-tolerant printed code encoding multiple biometrics, e.g., encoded image likeness and multiple finger print templates, maybe used with an off-line integrated positive identity verification apparatus that is capable of decoding the image and fingerprint samples taken from an individual whose identity is sought to be verified.

A process for the manufacture of a composite article is described wherein the process comprises the steps of (i) providing on a tool (22) a fibrous material (14) having associated therewith in at least one region thereof an in-situ polymerisable non-fibrous form of a thermoplastic material; (ii) applying heat and a vacuum to said material; and additionally (iii) drawing into the fibrous material, from a source external to the tool, additional thermoplastic pre-polymer material. The process described is particularly useful for the manufacture of a large composite structure such as thermoplastic composite wind turbine blade, for example.

A woven preform used to reinforce a composite structure which includes a central portion having a plurality of interwoven layers. The preform also includes first and second end portions having a plurality of independent woven layers that are integrally woven with the plurality of interwoven layers in the central portion and which extend along the entire length the preform. Interspersed between the plurality of independent woven layers in the first and second end portions are bias plies. The first and second end portions can have through thickness reinforcements comprising reinforcement fibers that traverse through the independent woven layers and the bias plies, locking them together.

An extruded structural member having improved damage tolerance containing a base section (6); a stiffening section having at least one pair of structural stiffeners (10), the structural stiffeners integral with the base section (6) and projecting outwardly thereof; and at least one intra-stiffener (90) area positioned between the pair of structural stiffeners (10), the intra-stiffener area (90) having a microstructure with intentionally increased amounts of fiber texture to reduce the rate of fatigue crack growth in the extruded structural member.

The present invention relates to a method for producing high strength balanced Al—Mg—Si alloy with an improved fatigue crack growth resistance and a low amount of intermetallics, comprising the steps of

• a) casting an ingot with the following composition (in weight percent) Si: 0.75–1.3, Cu: 0.6–1.1, Mn: 0.2–0.8, Mg: 0.45–0.95, Fe: 0.01–0.3, Zr: <0.25, Cr: <0.25, Zn: <0.35, Ti: <0.25, impurities each less than 0.05 and less than 0.20 in total, balance aluminum,
• b) optional homogenization of the cast ingot,
• c) pre-heating the ingot after casting for 4 to 30 hours with temperatures above 520° C.,
• d) hot working the ingot and optionally cold working,
• e) solution heat treating, and
• f) quenching the worked product.

The pre-heating is preferably performed for 6 to 18 hours with temperatures between 530° C. and 560° C. The alloy has a fatigue crack growth rate at ΔK=20 MPa√m of below 9.0E−04 and at ΔK=40 MPa√m of below 9.0E−03, wherein the amount of intermetallics within the finally worked alloy product, according to the measured specific energy Delta H associated with the DSC signal, is below 1.5 J/g.

A metal fiber-reinforced composite material can be produced by providing metal layers and reinforcing layers disposed alternately into a sandwich structure, the reinforcing layers containing fibers of a high-strength metallic material, which are disposed in the form of a loose structure between the metal layers, in order to create a material excess of fibers in the reinforcing layers, the sandwich structure being bonded by a thermomechanical process in such a manner, that the fibers are lengthened because of the excess of material, the sandwich structure being bonded.

Process for providing a protective coating to a metal surface by applying a nickel or tantalum plate layer to the surface and dispersing particles of a hard material such as diamond, alumina, vanadium nitride, tantalum carbide and/or tungsten carbide within the nickel or tantalum plate layer as the plating is occurring.

The present invention generally relates to a woven preform for reinforced composite materials and a method of making thereof. Specifically, the present invention is a method of machine weaving fiber preforms for polymer matrix composites that consist of closed perimeters with multiple intersecting members in their interiors. More specifically, the invention is a woven preform and a method of forming thereof with closed cells at the outer edges with continuous hoop reinforcement in each cell of the preform. The woven preform is woven flat in both the warp and weft directions, and then unfolded to achieve the final shape of the structure, and can be processed into composite structural components using known methods such as resin transfer molding or chemical vapor infiltration. Thus, complicated shapes of all sizes can be woven on a conventional loom using the instant method.

An improved method of joining fiber composite laminates is disclosed. Two fiber composite laminates may be joined together end-to-end. The bonding is done through the thickness of the fiber composite laminates. There are two ways to form the bond: (1) non-interlocking; and (2)

The invention relates to a work-hardened product, particularly a rolled, extruded or forged product, made of an alloy with the following composition (% by weight):

• • Cu 3.8-4.3; Mg 1.25-1.45; Mn 0.2-0.5; Zn 0.4-1.3; Fe<0.15; Si<0.15; Zr≦0.05; Ag<0.01,
  • other elements <0.05 each and <0.15 total, remainder Al treated by dissolution, quenching and cold strain-hardening, with a permanent deformation of between 0.5% and 15%, and preferably between 1.5% and 3.5%. Cold strain-hardening can be achieved by controlled tension and/or cold transformation, for example rolling, die forging or drawing. This cladded metal plate type product is a suitable element to be used as aircraft fuselage skin.

The invention relates to a weave method of 2.5-dimensional overall braided multi-through pipe fabric. The weave method is characterized in that (1) the structure of the fabric adopts a 2.5-dimensional shallow-cross bended-connection structure; (2) the overall weaving of the fabric adopts core imitation-shaped weaving to ensure the internal molded surface dimension of the fabric; (3) the fabric is divided into two parts, namely a connecting body part and a through pipe part, wherein the connecting body is a part connected with the through pipes, while the through pipes are connected through the same connecting body; (4) the lower section of each through pipe is provided with warp yarns of the part in advance; (5) weft yarns between through pipes in the same plane are lined between the warp yarns layer by layer through adopting a weft insertion process; (6) when the horizontal section of the connecting body increases, warp yarns are increased through adopting a shift yarn adding method, and the method can effectively improve the hole phenomenon in yarn-adding points; and (7) when the horizontal section of the connecting body decreases, warp yarns are reduced through adopting a shift yarn reduction method. The 2.5-dimensional multi-through pipe fabric woven by the weave method has the advantages of better overall property, controllable shaping, high damage tolerance, excellent performances of impact resistance, delamination resistance, fatigue resistance, and the like.

The present invention is weaving process of three-dimensional conic-casing fabric and its product. The weaving process includes the following steps: 1. pre-setting warp yarns based on the fabric structure and in tubular fabric weaving process; 2. introducing weft yarns in planar helical wefting method and interweaving with preset warp yarns; 3. setting warp cutting points on two sides based on the planar shape of the fabric and performing copying warp cutting operation; and 4. repeating the steps 2 and 3 until finishing the weaving of the three-dimensional conic-casing fabric. The present invention has short weaving period, low cost, simple operation, high efficiency, high adaptability and other features, and the fabric has high integrality, high damage tolerance, high impact resistance and other advantages.

The invention belongs to a technology for preparing composite materials and relates to a method for preparing rigid three-dimensional crystal whisker interlaminar modified continuous fiber composite materials. The interlaminar modified thermosetting resin composite materials are prepared by the following method by adoption of a micron-scale heteropical rigid micro 3-3 structure and adoption of a four-pin zinc oxide crystal whisker as an interlaminar reinforcement: firstly, the four-pin zinc oxide crystal whisker which is subjected to vacuum drying for 2 hours at a temperature of 100 DEG C is deposited on the surface of fabrics by means of a mechanical vibrating screen or electrostatic adherence or deposition through a fluidized bed or powdering through a drum-type silk screen, and modified fabrics are obtained; and secondly, after the modified fabrics are laid as required, the resin transfer molding technology or the resin membrane permeation technology is utilized for preparing the composite materials by the prior matrix resin solidifying technology. The method can improve the strong interlaminar toughening performance of the composite materials, obtain high surge impedance and high damaged tolerance, and cover the temperature range of structural application of typical aerospace composite materials and particularly cover the high temperature range of more than 300 DEG C.

The invention relates to a 2.5-dimension (2.5D) multidirectional extensible weaving method, which is characterized in that (1) a fabric adopts a 2.5D structure; (2) weaving of the fabric adopts core die simulation weaving; (3) top pavement weaving on the top of the center is finished by the conventional yarn paving and weft lining technology; and (4) after the top pavement weaving on the top of the center is finished, expansion is executed by selecting an expansion shape consistent with the top shape of the fabric according to the top shape. The 2.5D multidirectional extensible weaving method has the advantages that (1) bidirectional or multidirectional expansion of the top of the fabric can be realized, and overall forming of the fabric with a relatively complicated top shape is facilitated; (2) the fibers on the top are high in continuity; and (3) the uniformity during fabric forming is easy to control. The fabric woven by the weaving method has comprehensive performances such as high strength, high modulus, high damage tolerance, impact resistance, layering resistance and fatigue resistance; and the method can be widely applied to weaving fabrics which have sealed tops and are in various shapes in the field of stereo fabrics.

The invention relates to a nonwoven fabric containing a metal coating as well as a product thereof. The nonwoven fabric containing the metal coating is mainly characterized in that the structural characteristic of the nonwoven fabric is that the nonwoven fabric is a thin layer which has a network structure and is formed by low-surface-density fibers; a metal layer of copper, silver, nickel, nickel coated copper or nickel-copper-nickel is coated on the surface of the nonwoven fabric and has the thickness of 100nm-5 micron m, so that the nonwoven fabric layer has electrical conductivity and keeps soft, also can obviously intensify the interlayer fracture toughness and electrical conductivity of laminated plates when being applied to intercalation compounding material lamination plates, and meanwhile a compound material is endowed with higher shock damage impedance and damage tolerance as well as higher electrical conductivity. Corresponding prepregs can be directly used for laying and covering so as to obtain a high-electrical-conductivity compound material, and the corresponding compound material product can be used for high-electrical-conductivity shock-resistant occasions and aircraft lightning protection structural bodies.

A method of manufacturing a composite structural member (1), comprising the step of laying up a stack of fibre reinforced laminate plies (12), wherein at least one of the plies is laid up as discrete first (13) and second ply (14) portions, and the fibres of the second portion (14) have a different characteristic from those of the first portion (13). Also, a composite structural member (1) manufactured according to the method.

The invention discloses an integrally-formed three-dimensional weaving composite rotor wing blade and a manufacturing method thereof. The blade mainly consists of main parts of a root connecting joint, a blade up and down wing surface skin and a bearing main beam. The overall structure of the blade adopts is integrally formed by carbon fibers through a three-dimensional weaving process, and is integrally cured through an RTM process so as to finish blade processing. Compared with the conventional laminated composite blade, the blade in the scheme does not need secondary cementing and machining, the continuity of the bearing fiber inside the blade structure is ensured, the bearing efficiency of the structure is improved, meanwhile, the advantages of the three-dimensional weaving composite are fully played, the problems of lamination and cementing failures of the laminated composite are avoided, and the fatigue property and damage tolerance of the blade are improved.