55results about How to "Excellent fatigue resistance" patented technology

Disclosed is a photocurable resin composition suitable for photocuring cast molding, particularly a photocurable resin composition having excellent vibration fatigue durability. The photocurable resin composition comprises (A) at least one resin selected from a photoradical-polymerizable resin, photoradical-addition-polymerizable resin and a photocation-polymerizable resin, (B) a photopolymerization initiator, and one or both of (C) an antioxidant and (D) a photostabilizer. When cured, the photocurable resin composition shows a tensile elastic modulus of 1-30 MPa and a tensile elongation at break of 200% or more. The photocurable resin composition may additionally comprise (E) a rubber composition.

The invention relates to a cold construction color cementing material for resin concrete. According to the invention, a composite epoxy resin used as a substrate is prepared by mixing a bisphenol A type epoxy resin and a flexible epoxy resin and subjecting an obtained mixture to modification by a flexibilizer, a coupling agent and an anti-ageing agent; a curing agent is prepared by modifying a conventional curing agent with a dispersant and a defoaming agent; the cementing material has obviously superior high temperature performance, low temperature performance, water stability and fatigue resistance to those of common asphalt and SBS modified asphalt; the cementing material in a liquid state needs no extra heating in the processes of mixing, transporting, paving and compacting, according with requirements for energy saving and low carbon; when the prepared resin concrete for cold construction is used for laying of a pavement, a curing period is short, and traffic is rapidly opened; an inorganic pigment or organic pigment is added for preparation of the color cementing material which is applicable to pavements with different functional requirements; composition materials are easily available, and the cold construction color cementing material is prepared by using a conventional method and is easy for large scale popularization.

The invention relates to an aromatic polyamide fiber-silicone rubber cloth, a method for producing the same and an application thereof in the aspect of manufacturing a hose. The production method comprises the following steps that: silicone rubber virgin rubber is added with an auxiliary agent to be mixed into silicone gross rubber through a rubber refining machine; the silicone gross rubber is added with the auxiliary agent and a coupling agent to be stirred and prepared into silicone gross rubber paste; the silicone gross rubber paste is applied on the surface of an aromatic polyamide fiber cloth; sulfur treatment is performed; etc. The production method realizes direct adherence of the rubber and the surface of the aromatic polyamide fiber cloth by adoption of the method of adding the coupling agent in the silicone gross rubber. The product of the aromatic polyamide fiber-silicone rubber cloth produced by the method can meet the following performance indexes: the tensile strength of rubber materials is more than or equal to 6 MPa; the tear strength of the rubber materials is more than or equal to 30 N.mm<-1>; the adhesive strength between Ib rubber with flame-retardant property and a base-cloth layer is more than or equal to 3 N.mm<-1>; the service temperature is between 60 DEG C below zero and 200 DEG C; and the folding fatigue resistant time is more than or equal to 2 million times. The aromatic polyamide fiber-silicone rubber cloth is used for manufacturing various flexibly connected pipes and is a superior cloth for manufacturing a transition air channel hose of a pulling motor of a locomotive.

A Cu—Ti based copper alloy sheet material contains, in mass %, from 2.0 to 5.0% of Ti, from 0 to 1.5% Ni, from 0 to 1.0% Co, from 0 to 0.5% Fe, from 0 to 1.2% Sn, from 0 to 2.0% Zn, from 0 to 1.0% Mg, from 0 to 1.0% Zr, from 0 to 1.0% Al, from 0 to 1.0% Si, from 0 to 0.1% P, from 0 to 0.05% B, from 0 to 1.0% Cr, from 0 to 1.0% Mn, and from 0 to 1.0% V, the balance substantially being Cu. The sheet material has a metallic texture wherein in a cross section perpendicular to a sheet thickness direction, a maximum width of a grain boundary reaction type precipitate is not more than 500 nm, and a density of a granular precipitate having a diameter of 100 nm or more is not more than 10⁵ number/mm².

The invention discloses a durable high-modulus asphalt mixture based on hard asphalt particles. The asphalt mixture comprises 100 parts by mass of mineral aggregate and 5.3-5.7 parts by mass of asphalt, wherein the mineral aggregate comprises a limestone aggregate accounting for 96-98% of the total mass of the mineral aggregate, and limestone mineral powder accounting for 2-4% of the total mass of the mineral aggregate; and the asphalt is a compound of number 70 road petroleum asphalt and the hard asphalt particles. The asphalt mixture improves the gradation of the mineral aggregate, so that a coarse aggregate forms a good skeleton structure, and the shear property and the compressive property of the mixture are improved; and the property of asphalt adhesive cement in the mixture is improved by adding an appropriate amount of mineral powder, so that the surface of the mineral aggregate has appropriate asphalt membrane thickness. Therefore, the mixture is good in high temperature property, easy to compact, and excellent in fatigue resistance and durability; the capacity of a pavement for resisting damage of a track and the like can be improved if the mixture is used in a road middle surface course; the construction cost can be lowered; and the service life and the maintenance cycle of the pavement can be prolonged.

The invention provides a high-strength high-flexibility CuNiSn alloy material and a preparation method thereof. The high-strength high-flexibility CuNiSn alloy material comprises, by weight, 8.5-10.5% of Ni, 1.8-2.8% of Sn, 0.5-1.0% of Co, 0.005-0.01% of B, 0.01-0.05% of V, 0.1-0.5% of P, and the balance Cu. The alloy material is obtained through the processing treatment steps of smelting, casting, solution annealing, surface milling, rough rolling, intermediate annealing, acid pickling, intermediate rolling, secondary solution treatment, finish rolling, ageing heat treatment and the like. The tensile strength of the alloy material reaches up to 1230 MPa. Under the condition of the stress ratio being -1 and the number of circulation cycles being 107, the fatigue strength of the alloy is not less than 400 MPa. When the insertion and extraction force is greater than or equal to 1.5N, the number of insertion and extraction times is 41000-43000. Cracks occur after 46000 times of insertion and extraction, the use requirement for high-frequency and high-current elastic components can be met.

The invention relates to a chassis with a bus structure. The chassis comprises a sleeve, an instrument frame and a main control panel, wherein the instrument frame is arranged in the sleeve; a module card entrance is arranged at the rear end wall of the instrument frame; a power-supply module socket is arranged on the side wall of the instrument frame; a module card guide rail and the main control panel are arranged in the instrument frame; the main control panel is arranged on the side wall of the module card guide rail and is connected with the power-supply module which is arranged on the power-supply module socket; the instrument frame is fixedly connected by inserting a front frame and a rear frame; a bus rear panel is longitudinally arranged in the front frame; the module card is inserted into the module card guide rail through the module card entrance and is socketed with the bus rear panel; and the module card guide rail is connected with the rear frame and the front frame respectively in a clamping and hooking way. According to the chassis with the bus structure, the design difficult point of an instrument in a compact space is solved, as the internal main structures and the main control panel are all assembled by self-locking structure assembles such as plugging, clamping and hooking, the chassis is high in assembling efficiency, compact in structure and high in installation reliability.

To realize a thin plate material having a distribution state of nonmetallic inclusions effective at improving fatigue resistance characteristics in a type of stainless steel having a high Si content in which deformation-induced martensite is generated. A thin steel plate comprising, in terms of mass%, 0.010-0.200% C, over 2.00% and no more than 4.00% Si, 0.01-3.00% Mn, 3.00% to less than 10.00% Ni, 11.00-20.00% Cr, 0.010-0.200% N, 0-3.00% Mo, 0-1.00% Cu, 0-0.008% Ti, and 0-0.008% Al, the remainder being Fe and unavoidable impurities, the distance between particles in a rolling direction being20 [mu]m or less, the distance between particles in a plate thickness direction being 10 [mu]m or less, and the number density of nonmetallic inclusions having a length in the rolling direction of 40[mu]m or greater being 3.0 inclusions/mm2 or less in an L cross-section.

A lattice type derrick of an electric transmission line is formed by connecting a suspension base, a standard knot and a pulley in sequence. The two ends of the standard knot are provided with conical end joints. The standard knot and the end joints are formed by a plurality of joint bodies. Each joint body is made of carbon fiber reinforced resin matrix composite materials, and the adjacent joint bodies are connected through a flange. Each joint body of the standard knot comprises four vertical main pipes which are distributed in a rectangular mode and inclined pipes arranged between every two adjacent main pipes. Each end joint body comprises four main pipes which are distributed in a conical mode and inclined pipes between every two adjacent main pipes. Each flange comprises a rectangular base and inserting pipes arranged in the four corners of the rectangular base, and the main pipes of the standard knot and the main pipes of the end joints are inserted into the inserting pipes respectively to be bonded through glue. The derrick is made of the carbon fiber reinforced resin matrix composite materials and is high in strength and light in weight.

The invention relates to a processing technology for a spring made of a titanium alloy wire with a special-shaped section and belongs to the field of metal material processing. Titanium alloy components include the following elements in percentage by mass: 2-4 of Al, 8-11 of V, 4-8 of Cr, 4-8 of Mo, 3.5-6 of Zr and the balance of Ti. The spring is wound by using the titanium alloy wire with the special-shaped section, the titanium alloy wire with the special-shaped section, which is used for winding the spring, is prepared by using processes of ingot forging and cogging, finish forging, hot drawing and cold rotary forging, and the section of the wire can be shaped like a square, a rectangle, a regular hexagon and a regular octagon. Compared with a steel spring, the titanium alloy spring has favorable corrosion resistance and fatigue resistance and is stable in performance and obviously prolonged in life when being used in environments such as sea and other corrosive environments. In addition, the titanium alloy is relatively low in density which accounts for about 60% of that of steel, and therefore, a weight reducing effect can also be achieved if the steel spring is replaced with the titanium alloy spring.

A single column type derrick of an electric transmission line is formed by connecting a suspension base, a standard knot and a pulley in sequence. The two ends of the standard knot are provided with conical end joints. The standard knot and the end joints are formed by a plurality of circular pipe joint bodies. Each joint body is formed by winding carbon fiber reinforced resin matrix composite materials, and the adjacent joint bodies are connected through a flange. Each flange comprises a core pipe with the side wall provided with a groove and a tubular inner plate arranged on the top of the core pipe, wherein bolt holes are formed inside the groove in the circumferential direction, a boss is arranged between the inner plate and the core pipe, the inner plate is sleeved with the joint bodies, the inner plate and the joint bodies are bonded together through glue, and the end of each joint body abuts against the corresponding boss. The derrick is made of the carbon fiber reinforced resin matrix composite materials and is high in strength and light in weight.

The invention relates to a polyurethane flexible foam material for a railway curing ballast bed, and belongs to the technical field of curing ballast bed materials. The polyurethane flexible foam material comprises the following components in parts by mass: 100 parts of a material A and 86-91 parts of a material B, wherein the material A is prepared from the following materials in parts by mass: 100 parts of polyether polyol, 30-40 parts of bio-based polyol, 20-30 parts of a flame retardant, 4-8 parts of a small molecule chain extender, 1.75-2.75 parts of a foaming agent and 0.6-1.2 parts of a catalyst; the material B is prepared from the following materials in parts by mass: 57 to 63 parts of isocyanate and 37 to 43 parts of polyether polyol.

A silicon-killed steel wire material which has been made suitable for obtaining a spring with excellent fatigue properties by regulating inclusions so as to be reduced in melting point and thereby facilitating deformation. Also provided is a spring having excellent fatigue properties which is obtained from the steel wire material. The silicon-killed steel wire material contains oxide inclusions which comprise 30-90% SiO2, 2-50% Al2O3, up to 35% (excluding 0%) MgO, up to 50% (excluding 0%) CaO, up to 20% (excluding 0%) MnO, and 0.2-20% BaO, provided that the total content of CaO and MgO is 3% or higher.

Disclosed is a Si killed steel wire material for producing a spring having an excellent fatigue property. Also disclosed is a spring having an excellent fatigue property, which is produced from the steel wire material. The Si killed wire material comprises 0.03 to 20 ppm (''ppm'' means ''ppm by mass'', hereinbelow) of Sr, 1 to 30 ppm of Al and 0.2 to 4% (''%'' means ''% by mass'', hereinbelow) of Si, and additionally comprises Mg and/or Ca in a total amount of 0.5 to 30 ppm. The Si killed wire material contains an oxide inclusion comprising 30 to 90% of SiO2, 2 to 50% of Al2O3, 35% or less (more than 0%) of MgO, 50% or less (more than 0%) of CaO, 20% or less (more than 0%) of MnO and 0.2 to 15% of SrO, wherein the total content of CaO and MgO is 3% or more. A spring formed from the steel wire material has an excellent fatigue property.

The invention discloses a novel self-adaptive camouflage coating as well as a preparation method and application thereof. The self-adaptive camouflage coating comprises a component A and a component B in a mass ratio of 10: (1-10), the component A comprises an off-color material, a film-forming substance, a solvent, a pigment and an auxiliary agent in a mass ratio of (1-10): (30-60): (10-15): (20-50): (2-10); and the component B is a curing agent. The preparation method comprises two steps, namely, preparation of the component A and preparation of the self-adaptive camouflage coating. According to the self-adaptive camouflage coating provided by the invention, the binding strength of the camouflage coating and a substrate can be greatly improved, and the fatigue resistance and environmental adaptability of the camouflage coating are enhanced; and the preparation method provided by the invention is simple in process and suitable for mass production, the prepared self-adaptive camouflage coating can be applied to manufacturing of military protection, functional fibers, fabrics and clothes, and the prepared camouflage coating is excellent in fatigue resistance and high in environmental adaptability.

The invention discloses an efficient low-noise reciprocating piston type refrigerator compressor. The efficient low-noise reciprocating piston type refrigerator compressor comprises an air suction valve slice, an exhaust valve slice and a valve plate, wherein the compressor operates back and forth in the manner that a motor drives a crankshaft and the crankshaft drives a piston, and a coating is arranged on the surface of either the air suction valve slice or the exhaust valve slice; or the surfaces of the air suction valve slice and the exhaust valve slice are respectively provided with a coating; the coatings are made of polytetrafluoroethylene or PEEK engineering plastics. In addition, the invention further relates to the manufacturing process of the refrigerator compressor. By means of the technical scheme, the noise of the valve slices of the compressor is largely lowered, fatigue strength is improved, the gas transmission coefficient of the compressor is increased, and therefore the refrigerating capacity is increased. The effect of eliminating the exhaust pulse of the compressor is good, and pressure loss is reduced, so that the gas transmission coefficient is increased. The noise of the compressor is lowered, the energy efficiency ratio of the compressor is improved, and the purposes of saving energy and protecting the environment are achieved.

The invention discloses a refrigerator, a wind blocking strip used for the refrigerator and a manufacturing method thereof. The manufacturing method of the wind blocking strip used for the refrigerator comprises the steps that first, rigid plastic is added into a first extruding machine, a thermoplastic polyester elastomer (TPEE) modified material is added into a second extruding machine; second, the molten and plasticized rigid plastic and the TPEE modified material are collected at machine heads of the first extruding machine and the second extruding machine, and the formed wind blocking strip is obtained; and third, the formed wind blocking strip is shaped and cooled sequentially, and the wind blocking strip used for the refrigerator is obtained. A clamping groove is made of the rigid plastic, a folded edge is made of the TPEE modified material, and through different moulds and a certain process condition, the rigid plastic and the TPEE modified material are extruded together to be manufactured to be the wind blocking strip; because the TPEE modified material has the strength of engineering plastic and the elasticity of rubber, the friction resistant capacity and the elasticity and airtightness at the low temperature of the wind blocking strip are all improved, accordingly the service life of the wind blocking strip is prolonged, and the energy consumption of the refrigerator is reduced.

The invention relates to an ethylene-acrylate rubber formula for turbocharging rubber pipes. The ethylene-acrylate rubber formula comprises, by weight, 25-50 parts of ethylene-acrylate rubber HT-OR, 50-75 parts of ethylene-acrylate rubber 5394, 1-3 parts of stearic acid, 1-3 parts of an anti-aging agent 445, 0.5-2 parts of an auxiliary agent 18D, 1-3 parts of an auxiliary agent VAM, 50-80 parts ofcarbon black N550, 10-40 parts of N990 carbon black, 10-30 parts of a plasticizer TP759, 1-4 parts of a cross-linking agent ACT55 and 1-2 parts of a cross-linking agent Diak No.1. A turbocharging pipe assembly prepared according to the formula is excellent in fatigue resistance and aging resistance and high in pulse frequency, the service life of the turbocharging pipe assembly under high-power extreme severe conditions is greatly prolonged, and safety and practicality of the HT-AEM turbocharging pipe assembly are improved.