25 results about "Elastic modulus" patented technology

Provided are a polyimide tube including a polyimide resin composition, wherein the polyimide resin composition contains a polyimide resin in which an acicular highly thermally conductive filler such as carbon nanotubes is dispersed in 15 volume percent or more relative to the total volume of the composition; the acicular highly thermally conductive filler has an orientation of 1.3 or more, the orientation being represented by the modulus of elasticity of the polyimide resin composition in the circumferential direction/the modulus of elasticity of the polyimide resin composition in the axial direction; and the polyimide tube has high thermal conductivity, is excellent in terms of mechanical strength and indentation strength, and provides a high fixing property and an excellent offsetting property; a process for producing such a tube; and a fixing belt including such a tube serving as a base member.

Ultrahigh-toughness concrete and a preparing method thereof are disclosed. The concrete is prepared from, by weight, 380-580 parts of cement, 150-170 parts of slag powder, 250-380 parts of fly ash, 200-400 parts of quartz sand, 13-15 parts of bamboo wood phenolic alcohol liquified resin, 13-18 parts of polypropylene resin, 0.5-1.5 parts of carboxymethylcellulose, 23-47 parts of core-shell acrylic acid elastic emulsion, 5-10 parts of a chemical-resistant modifier, 14-18 parts of bamboo fibers, 2.5-8.5 parts of nanometer silicon particles, 7-13 parts of nanometer calcium carbonate, 3-5 parts of anionic polyacrylamide, 3.7-8.3 parts of poly(diallyldimethylammonium chloride), 0.4-1 part of poly(ethylene glycol) acrylate, 20-30 parts of an acrylic emulsion, and the like. The ultrahigh-toughness concrete has high tensile strength, high compressive strength, ultrahigh ductility, good energy consumption capacity and good elastic modulus.

A heavy duty tire having a bead wind structure and comprising a bead reinforcing layer 15 having a U-shaped cross section disposed in each bead portion 4, wherein the axially outer portion 15o of the bead reinforcing layer 15 and its radially outer end Pe are protected by an axially inner rubber 20 disposed between the carcass main portion 6aand the outer portion 15o and an axially outer rubber 30 disposed between the outer portion 15o and the axially outer surface TS of the tire, in which the inner rubber 20 includes a first low modulus rubber portion 21 having a complex elastic modulus of 3.0 to 6.0 MPa, the thickness Ti of the inner rubber 20 measured on a first base line X1 drawn from the radially outer end Pe at right angles to the carcass main portion 6a is from 7.0 to 13.0 mm and the ti/Ti ratio of a thickness ti of the first low modulus rubber portion 21 on the first base line X1 to the thickness Ti is at least 0.9; and in which the outer rubber 30 includes a second low modulus rubber portion 31 having a complex elastic modulus of 3.0 to 6.0 MPa, the thickness To of the outer rubber 30 measured on a second base line X2 drawn from the radially outer end Pe at right angles to the axially outer surface TS of the tire is from 5.0 to 11.0 mm and the to/To ratio of a thickness “to” of the second low modulus rubber portion 31 on the second base line X2 to the thickness To is at least 0.4. The weight of the bead portion can be reduced while maintaining the bead durability.

A toner comprising a toner particle containing a resin and a colorant, wherein, with respect to a temperature-storage elastic modulus curve obtained by powder dynamic viscoelastic measurement on the toner, (I) the relative minimum values for the variation in the storage elastic modulus E′ with respect to temperature T in the temperature range of at least 30° C. and not more than 180° C. have a relative minimum value of equal to or less than −1.00×10⁷ and the relative minimum value on the lowest temperature side is equal to or less than −1.00×10⁸; (II) the storage elastic modulus E′ (50) of the toner at 50° C. is at least 1.00×10⁹ and not more than 9.00×10⁹; and (III) for a storage elastic modulus E′ (120) of the toner at 120° C., E′ (50) and E′ (120) satisfy 1.50≤[E′ (50)]/[E′ (120)]≤3.00.

The invention discloses a winding pipe with a fiber reinforced polypropylene (FRPP) reinforced hollow-structure wall. The winding pipe is divided into FRPP inner layers, high-density polyethylene (HDPE) tube outer layers and HDPE adhesion layers, wherein each FRPP inner layer and the corresponding HDPE tube outer layer form a square unit tube together, and the square unit tubes are bonded together through the HDPE adhesion layers to form the whole winding pipe. According to the design of the winding pipe, on the one hand, the ring stiffness of the tubes is improved through the high-elasticity modulus of the FRPP material, on the other hand, the ring flexibility of the tubes is maintained through the toughness of the HDPE; besides, by means of the rapidly cooling crystallization property of the HDPE material, the square unit tubes of the hollow structures can be formed rapidly, the stability of the forming process for the tubes is guaranteed, and the product performance is reliable; for another, the usage of the raw materials can be lowered, the proportion of the FRPP material in the raw materials is increased, meanwhile, the product mass is reduced, and transportation is convenient; according to the winding pipe, the production process is simple and easy to implement, and production of the winding pipe of the large diameter can be achieved.

A tissue engineering scaffold of interconnected and bonded fiber having a property with a value that is spatially distributed in at least two regions is provided. The scaffold has at least two regions with properties, such as porosity, strength, elastic modulus, osteoconductivity, and bioactivity that can be controlled and modified through fabrication processes that alter the pore size, pore size distribution, composition, and bonding of fiber and other additives. The value of the property can be provided with a gradient between each of the adjacent spatially distributed regions.

The invention discloses a method for preparing cement asphalt (CA) mortar for China railway track system (CRTS) II slab ballastless tracks, which comprises the following steps of: (1) mixing cement with fine sand, an expanding agent and aluminum powder according to proportion to prepare dry CA mortar powder; and (2) sequentially adding a poly carboxylic acid serving as a high-performance water reducing agent, an antifoaming agent and silica sol into water for uniform stirring, adding the dry CA mortar powder for uniform stirring, and adding asphalt emulsion for uniform stirring to obtain the CA mortar for the CRTS II slab ballastless tracks. The method has the advantages of: (1) avoiding cement particles competitively absorbing an emulsifier in the asphalt emulsion, and preventing the asphalt emulsion in the CA mortar from being demulsified to cause bleeding; and (2) reducing the using amount of the asphalt emulsion and the using amount of the water on the basis of ensuring flowability, and strengthening the strength of the CA mortar on the basis of meeting an elastic modulus of the CA mortar.

The invention relates to a porous elastic foam production method based on 3D printing of wet cured silica gel. More than eight layers of foam materials are produced by utilizing a fluid printer. Each layer of foam material is formed by uniformly arranging patterns of different shapes, and the patterns are classified into five types, i.e. a rectilinear type, a sinusoid wave type, an 8 type, a winding type, and a side-kick type; the processing technological parameters are silica gel viscosity R, silica gel ejection flow rate Q, a diameter D of a spray head, a height H of the spray head and a moving speed UO of the spray head; among the technological parameters, the silica gel viscosity R, the silica gel ejection flow rate Q and the diameter D of the spray head are conventional technological parameters, the height H of the spray head is 6 to 51 mm, and the moving speed UO of the spray head is 2 to 14 mm/s; pattern parameters are a vibration amplitude W of a graph, a periodic length P of the graph and a loop width of the graph; and a porosity of a finished product is 30 to 50 percent, and an elastic modulus is greater than 5.0KPa. Average time for producing the porous silica gel elastic foam in a 3D printing manner is 50 to 70 min, and the production efficiency is greatly improved.

The invention, which relates to the field of a robot cycloidal speed reducer, provides a device and method for analyzing the cycloidal-pin wheel planetary transmission acting force. According to the invention, a cycloidal-pin wheel planetary transmission acting force is calculated based on an obtained short-amplitude coefficient, a pin wheel radius, a rotating angle of the cycloidal-pin wheel in an anticlockwise direction, a pin wheel tooth number, a pin wheel elasticity modulus, a cycloidal-pin wheel elasticity modulus, a cycloidal-pin wheel tooth width of the cycloidal-pin wheel as well as an included angle between a pressure vector applied to the cycloidal-pin wheel by using the geometric center of the cycloidal-pin wheel as a vertex and a Y axis. Therefore, the calculation efficiency of the analysis of the cycloidal-pin wheel planetary transmission acting force of the cycloidal speed reducer is improved; and the precision is high and the labor cost is low.

Provided is a thermoplastic resin composition in which filler such as glass fiber is incorporated to enhance rigidity, and which is further improved in hand touch feeling and occurrence of squeaking noise. The thermoplastic resin composition comprises a rubber-reinforced aromatic vinyl resin (A, B), a crystalline thermoplastic resin (C), and a fibrous or layered filler (D), wherein the thermoplastic resin composition has melting points, as measured according to JIS K7121-1987, between 0 and 100° C. and between 170 and 280° C., and a bending elastic modulus of 3,000 MPa or higher. The component (A) preferably comprises an ethylene/α-olefin rubbery polymer (a1) having a melting point of 0 to 100° C. as measured according to JIS K7121-1987. The component (C) preferably has a melting point of 170 to 280° C. as measured according to JIS K7121-1987, and is preferably at least one selected from the group consisting of a polyester resin and a polyamide resin.

The invention discloses a method and a system for calculating the thickness of a railway track ballasted track bed. The method includes the following steps: obtaining the design parameters of railwaytrack; calculating the design wheel load and the equivalent times of the design wheel load action according to the design parameters; performing acquisition of geological prospecting parameters; geological prospecting parameters including elastic modulus of ballast bed, type, thickness, elastic modulus and compressive strength of subgrade soil; obtaining the design requirements and determine the allowable stress and deformation according to the design requirements; performing calculation of Deviator Stress of Roadbed Based on Geological Prospecting Parameters and Allowable Stress. the plasticstrain factor and the cumulative settlement factor are calculated according to the design wheel load, the equivalent number of wheel load actions, the allowable deformation and the deviator stress ofthe subgrade. According to plastic strain factor and cumulative settlement factor, the thickness of ballasted track bed is determined. The invention comprehensively considers the plastic strain and the accumulated settlement of the roadbed under the action of the cyclic load, and greatly reduces the occurrence of the diseases of the 'ballastbags' and the 'roadbed uplift' in the railway.

The invention relates to metallurgical materials, in particular to a preparation method of a high strength, high modulus and high plasticity ceramic particle aluminum-based composite material. Siliconcarbide particles with different particle sizes are uniformly mixed due to ball milling, and then are filled into a mold; the mold is put into a heating furnace, and the mold is uniformly heated according to a corresponding temperature rising speed; an aluminum alloy is placed into an aluminum smelting furnace to be melted and cast, and vacuumizing and stirring are performed; the heated mold is moved to a hot press platform, and an aluminum solution in the aluminum smelting furnace is injected into the mold; a hot press is adjusted to a certain pressure and pressure maintaining time, hot pressing is performed, and then demolding is performed; and casts after demolding are forged so that the high strength, high modulus and high plasticity ceramic particle aluminum-based composite materialis obtained. The strength, the elastic modulus, the plasticity and the like of a produce prepared through the method are improved.

The invention discloses alkali-free silicate glass with a low expansion coefficient and a high strain point. The chemical compositions of each oxide of the glass are limited; the main composition SiO2is limited to a certain range, so that the strain point of the glass is increased, and the chemical stability of the glass such as acid resistance is ensured; and the total mass percentage of the SiO2 and Al2O3 is limited, so that the strain point and elastic modulus of the glass are increased, and the chemical stability of the glass is improved. The glass compositions basically do not contain alkali metal oxides, so that the stability of the gate voltage of a thin film transistor is ensured; the density of the glass containing the chemical compositions is lower than 2.6g/cm<3>, and the thermal expansion coefficient is less than or equal to 50*10<7>/ DEG C, the strain point of the glass is greater than or equal to 695 DEG C; and the physical property parameters of the glass in the composition range can satisfy the composition requirements of the base glass.

The present invention provides a rubber composition for an undertread, the rubber composition achieving excellent low heat build-up and high elastic modulus when formed into a tire; and a pneumatic tire that includes the rubber composition. The rubber composition for an undertread contains a diene rubber and a carbon black. The diene rubber contains a natural rubber and a modified polymer that is obtained by reacting a nitrone compound with a double bond of a conjugated diene polymer. The content of the natural rubber in the diene rubber is 60 mass % or greater, the content of the modified polymer in the diene rubber is from 8 to 40 mass %, the content of the carbon black is from 30 to 67 parts by mass per 100 parts by mass of the diene rubber, and the nitrogen adsorption specific surface area of the carbon black is from 20 to 60 m²/g.

The invention discloses a dental implant containing a polyether-ether-ketone interlayer and a manufacturing method thereof. The dental implant comprises an outer base pile, an inner base pile and thepolyether-ether-ketone interlayer, wherein the outer base pile and the inner base pile are both standard revolved bodies; and a blind hole is formed in the outer base pile, the inner base pile comprises a cylindrical table and a connection rod perpendicular to the end face of the cylindrical table, the polyether-ether-ketone interlayer is fixedly arranged in the blind hole and provided with an inner thread fit with the connection rod, and the inner base pile is in threaded connection with the polyether-ether-ketone interlayer through the connection rod. The dental implant containing the polyether-ether-ketone interlayer reduces the whole elasticity modulus of the dental implant by adding the polyether-ether-ketone interlayer. The damaged dental implant can be conveniently dismantled and replaced by means of multi-layer structural design, and damage is reduced as well, especially when a central screw is always out of work. Meanwhile, the multi-layer structural design is beneficial for recycling and reusing of intact parts. The manufacturing method is easy and simple to operate, and the product cost is reduced.

The invention discloses an all-steel radial tire shoulder pad rubber formula, which is characterized by comprising the following raw materials in parts by weight: 100 parts of unvulcanized rubber SMR10#, 28-45 parts of medium-structure carbon black, 2-4 parts of vulcanizing agent S, 0.5-1.2 parts of accelerator, 4-7 parts of activating agent, 1.5-3 parts of anti-aging agent and 1-3 parts of tackifier. The invention has the advantages of simple and accessible raw materials, low price, low heat generation and high elastic modulus; and the physical properties of the rubber matrix are suitable for the characteristics required by the position.

The invention discloses an angle steel-gusset plate connection node semi-rigidity detection method in a power transmission angle steel tower structure. The method comprises the following steps that: S10, angle steel is installed on a gusset plate to obtain multiple groups of measuring pieces, wherein the measuring pieces are numbered, the angle steel and the gusset plate are made of Q420 steel, and bolts are 8.8-level or 10.9-level high-strength bolts of M20; S20, the measuring pieces are mounted on the testing device, and a measuring scheme is made; S30, the pressurization test is conducted on the test piece through a test device to obtain corner data of an angle steel shearing domain and a node domain; S40, the tensile test on each angle steel is carried out to obtain ultimate tensile stress, elastic modulus, yield stress and yield strain, wherein test piece sampling position of the angle steel is at a position which is 1/3 away from the limb width in the longitudinal direction of the angle steel; S50, the bearing capacity of the node plate, the local shearing corner of the angle steel and the bending moment bearing capacity of the node are is detected; and S60, the test structure of the angle steel-gusset plate is analyzed. The method has the advantage of accurate measurement data.

An optical information recording medium is provided having a superior jitter property even when an organic substance is used for a recording layer. The optical information recording medium has a substrate having a penetrating hole in a central portion thereof and a spiral pre-groove provided in one surface of the substrate, a reflection layer provided on the surface of the substrate in which the pre-groove is provided, a recording layer which is provided on the reflection layer and which is composed of an organic substance including a dye, and a light transmissive cover layer provided on the recording layer. In the optical information recording medium, the cover layer has an elastic modulus of 40 MPa or less at 25° C. in an interface region facing the recording layer.

The invention relates to a method for improving the elastic modulus of waxy barley leavened bread by using lipase, and belongs to the technical field of food processing. Waxy barley flour, high-gluten wheat flour, granulated sugar, yeast and lipase are added into a stirring cylinder and uniformly mixed; ice water is added into the stirring cylinder, and the mixture is continuously stirred until a gluten film of dough is formed; salt and shortening are added, the mixture is continuously stirred until an uniform and transparent thin film is formed; the dough is taken out and allowed to stand still, cut, rounded, leaved to rise and baked, and finally finished products of the bread can be produced. The waxy barley flour is used as the raw material to increase the nutrition of the products, the lipase is added into the waxy barley flour dough to increase the strength, the extensibility and the elasticity of the waxy barley flour dough, and increase the specific volume of the finished products. The lipase's emulsifying property and the complexing property with amylose are utilized to improve the elasticity and the leavening stability of the waxy barley flour dough and delay the aging of starch, so as to furthermore improve the texture and the taste of the finished products and obtain the waxy barley leavened bread with uniform and fine internal structure and stable shelf life.

The invention discloses a high-elasticity modulus and high-strength glass fiber laminated board and a preparation method thereof, and belongs to the technical field of laminated board preparation. The laminated board is prepared by coating glass fiber cloth with a mixed glue solution and then laminating and thermally curing the glass fiber cloth, the glass fiber cloth is a fabric of direct twistless roving, and the direct twistless roving is formed by coating the surface of glass fiber with an impregnating compound. The impregnating compound is prepared from the following components in parts by weight: a silane coupling agent, an epoxy resin emulsion, a waterborne polyurethane emulsion, a surfactant, a pH regulator and deionized water. According to the invention, the glass fiber cloth is modified through the silane coupling agent and the surfactant in a specific ratio, so that the compatibility of the glass fiber cloth and the phenolic resin is improved, and the prepared laminated board has higher elastic modulus and strength.