58results about How to "Retard crack growth" patented technology

The invention provides a drift fault recognition method of hot-rolling strip steel based on sound signals. The method comprises the following steps of: preprocessing a signal by combining the features of a hot-rolling production line and adopting a resampling and framing technology, carrying out feature extraction on the signal by adopting a Mel frequency cepstrum technology and carrying out feature selection and recognition by adopting a principal component analysis method and a multivariate statistic process T2 control diagram so as to realize the diagnosis of drift faults of the hot-rolling strip steel. The invention has the advantages that the drift phenomenon can be judged accurately and rapidly on line by utilizing an acoustic detection method, the roller replacement time can be reasonably arranged, the roller consumption can be effectively reduced, the production cost can be controlled, and the quality defect prevention capacity and the production operability of the product can be improved.

The present invention relates to a ribbon-shaped strip used for an inner liner and a method for manufacturing the strip. The strip is to be wound on an outer circumferential surface of a tire molding drum or a core body to form an inner liner. The strip has an inner layer disposed inwardly in a tire and an outer layer disposed outwardly in the tire. The inner layer and the outer layer are bonded to each other with their ends offset by 0.5 mm to 30 mm in a widthwise direction. At least one layer of the inner layer is formed of an elastomer composition containing a styrene-isobutylene-styrene block copolymer. At least one layer of the outer layer is formed of a thermoplastic elastomer composition.

The invention discloses a flexible display panel and a display device. The flexible display panel comprises a substrate, an organic light emitting structure and a package thin film layer, wherein the organic light emitting structure is arranged on the substrate, the package thin film layer covers the organic light emitting structure, the flexible display panel also comprises a first upper protection layer and a first lower protection layer, the first upper protection layer is attached onto one side, deviating from the organic light emitting structure, of the package thin film layer, the first lower protection layer is attached onto one side, deviating from the organic light emitting structure, of the substrate, the first upper protection layer exceeds a region where the substrate is located at least in a bending shaft direction of the flexible display panel, and/or the first lower protection layer exceeds a region where the substrate is located at least in the bending shaft direction. The problem that stress is concentrated at an edge of the package thin film layer when the flexible display panel is bent is prevented by a part of the first upper protection layer or the first lower protection layer exceeding the substrate, so that the problem of crack expansion caused by bending of the flexible display panel can be solved.

An additional fiber reinforced layer reduces crack propagation in a lightweight structure of an outer skin adhesively bonded to a reinforcing frame. For this purpose the additional fiber reinforced layer is interposed between the outer skin and the frame and adhesively bonded to the outer skin and to the frame. The additional layer has reinforcing fibers extending in parallel to each other or the reinforcing fibers are woven into a fabric embedded in a synthetic adhesive bonding material. The embedding of the parallel fibers or of the fiber fabric in the bonding material is performed either prior to the bonding or during the bonding of the additional layer to the outer skin and to the reinforcing frame.

A method for laser shock peening (LSP) to uniformly strengthen metallic components uses varied square-spot LSP with stagger multiple-layer. Each layer is subjected to square-spot LSP treatment, without overlapping. The length of square-spot in the first layer is larger than those in the second layer and third layers, and the length of square-spot in the second layer is equal to that in the third layer. The first layer treated by LSP is used to reduce deeper localized compressive residual stress, and the second and third layers imparted by square-spot LSP with staggered distance are used to eliminate of the boundary effect and decrease surface roughness.

The invention belongs to the field of surface strengthening, relates to hole wall inner surface strengthening, and particularly relates to a device for strengthening inner wall surfaces of center holes of oil injectors and a method for applying the device. The device comprises a cavitation nozzle. An inlet which is connected with high-pressure fluid is formed in one end of the cavitation nozzle, and two and more orifices are formed in the other end of the cavitation nozzle; the outer diameter of the cavitation nozzle is not larger than the inner diameters of the center holes of the oil injectors. The device and the method have the advantage that the device is suitable for strengthening treatment on the inner wall surfaces on high-precision finished components and semi-finished components and the inner wall surfaces of thin-walled components.

The invention discloses a preparation method of a bulletproof ceramic entire board. The preparation method of the bulletproof ceramic entire board is characterized by comprising the following steps of(1) preparing a slurry: placing raw materials into a mixing and pulping device, ball milling for 10 to 24h, and uniformly stirring to obtain the slurry; (2) adopting a high-pressure grouting formingmachine for injecting the prepared slurry into a mold; (3) adopting a two-step pressurizing manner for pressurizing and grouting forming; (4) drying a ceramic green body in a drying oven at the temperature of 30 to 150 DEG C for 5 to 24 hours, and obtaining a ceramic dry blank; (5) sintering the ceramic dry blank in a sintering furnace so as to obtain a ceramic inserting plate. The method can be used for processing the layered bulletproof ceramic entire board at one step through changing a formula of the ceramic slurry and two-step forming process conditions, and is simple in preparation process and excellent in bulletproof performance.

Provided is a pneumatic tire including an inner liner on a tire inner side of a carcass ply laid between a pair of bead parts, the inner liner having a first layer made of a first polymer composition, the first polymer composition containing not less than 0.5 parts by mass and not more than 70 parts by mass of at least one selected from the group consisting of liquid polyisoprene, a maleic anhydride adduct of liquid polyisoprene, and a maleic acid monomethyl ester adduct of liquid polyisoprene, relative to 100 parts by mass of a styrene-isobutylene-styrene triblock copolymer.

The invention discloses a high-fracture-toughness two-state titanium-aluminum-based composite material and a preparation method thereof. The high-fracture-toughness two-state titanium-aluminum-based composite material is prepared from, by atomic percentage components, 2-5% of Nb element powder and balance Ti-XAl-YNb-0.4W (at.%) prealloyed powder, wherein X is 40-50, and Y is 5-10. The toughened high Nb-TiAl composite material containing plastic Nb particles is prepared through a powder metallurgy technology and canned forging, the preparation method is simple and easy to operate, and the preparation process is simple. The structure of the prepared two-state titanium-aluminum-based composite material contains fine gamma-TiAl matrix structure and the Nb particles of which the sizes are abot100 micros and randomly distributed in the matrix structure, and the Nb particles are composed by pure Nb phases and beta phases and strip-shaped omega phases which surround the pure Nb phases, so that the crack propagation in the titanium-aluminum-based alloy is effectively delayed, thereby improving the fracture toughness, strength and plasticity of the composite material, and therefore the high-fracture-toughness two-state titanium-aluminum-based composite material is expected to be used for aerospace high-temperature structural components, and the application range of the titanium-aluminum-based composite material is effectively widened.

The invention discloses a carbon fiber/epoxy resin composite material for a bicycle. The carbon fiber/epoxy resin composite material is prepared from, by weight, 1-3 parts of carbon fiber, 30-50 parts of epoxy resin, 2-5 parts of floating bead, 3-8 parts of gelatin, 2-3 parts of medical stone powder, 1.5-3 parts of coupling agent, 2-5 parts of curing agent and 1-2 parts of accelerant. The invention further discloses a preparing method of the composite material. The composite material is high in heat and abrasion resistance, high in specific strength and excellent in impact resistance and has certain corrosion resistance.

An aluminium-based conductive material used in a driving part of robots or various devices and used, for example, in a wiring that is loaded with cyclic bending, as well as an electric wire and a cable using the same, contains 0.1 to 1.0 mass % of scandium and further contains, as a rest part, aluminium and unavoidable impure substances and is formed of a metal texture 10 having crystal grains 11 with an average grain size of 2 μm or less and aluminium-scandium series nanoprecipitates generated in a grain boundary 12 of the crystal grains 11. Further, it is preferable that the metal texture 10 contains the crystal grains 11 of 1 μm or less at a cross sectional ratio of 15% or more.

The present invention relates to a polyethylene composition comprising a base resin having a density of from 952.0 kg/m³ to 960.0 kg/m³, determined according to ISO 1183, wherein the polyethylene composition has a melt flow rate MFR₂₁ (190° C., 21.16 kg), of from 1.0 to 7.5 g/10 min, determined according to ISO 1133, a complex viscosity at a frequency of 0.05 rad/s eta0.05 of from 750 kPa #s to 1900 kPa #s, determined according to ISO 6721-1 and ISO 6721-10, and a white spot rating of not more than 12.0, determined according to ISO 18553, a polyethylene composition obtainable by a multi-stage process, a process for producing said polyethylene composition, an article, such as a pipe or pipe fitting, comprising said polyethylene composition and the use of said polyethylene composition for the production of an article.

The present invention relates to a method for manufacturing a component of austenitic TWIP or TRIP/TWIP steel. A flat product (1) is deformed by achieving at least one indentation (16) on at least one surface of the flat product (1) in order to have in the deformed product (5) areas of a high strength steel embedded in a matrix of a ductile material. The invention also relates to the use of the component where areas of a high strength steel embedded in a matrix of a ductile material are required in the same component.

The invention relates to a preparation method of graphene-silicon carbide fiber synergetically reinforced metal composite material and belongs to the field of metal-base composite materials. The preparation method comprises the following steps: carrying out in-situ growth of silicon carbide fibers on the surface of graphene by means of chemical vapor deposition; putting the obtained composite powder and metal powder which are sheared and mixed at a high speed in liquid nitrogen to be quickly frozen and then carrying out freeze drying to obtain graphene-silicon carbide/metal composite powder; and carrying out spark plasma sintering on the composite powder to obtain the high density graphene-silicon carbide/metal composite material. The composite material metal matrix prepared by the invention is compactly combined with a reinforced phase, the tissues are compact, and the material has relatively high strength and keeps good toughness simultaneously. The preparation method provided by theinvention is simple in process and low in cost. An interface strengthening action is generated when the silicon carbide fibers of in-situ growth and a metal are compounded, so that the toughness of the metal matrix is further improved.

According to the invention, a line (1) consisting of synthetic material is provided for a wiring arrangement. Said line is provided with segments (2) that are articulated to one another and are defined crosswise in relation to the longitudinal direction of the line (1) by means of transversal separations (4) that extend as far as the proximity of a supporting wall area (5). The line (1) is at least partially provided with a reinforcement fibre (6) that extends essentially in parallel in relation to the line direction and is essentially arranged in the supporting wall area (5). The line (1) is extruded and the segments (2) are configured. At least one reinforcement fibre (6) is provided before or after said configuration.