60results 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.

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.

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.

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.