258 results about "Tensile shear" patented technology

The invention relates to high-temperature-resistant modified polyfunctional epoxy matrix resin for an advanced composite material. The resin comprises tetramaleimide resin, carboxy terminated nitrile rubber, polyfunctional epoxy resin, a curing agent and an organic solvent. A preparation method comprises the following steps of: adding the tetramaleimide resin, the carboxy terminated nitrile rubber and the polyfunctional epoxy resin into a reaction kettle and reacting at the temperature of 110 DEG C for one hour; adding the organic solvent and dissolving under stirring to obtain a component A;mixing the curing agent and the organic solvent and dissolving under stirring to obtain a component B; and mixing the component A and the component B and uniformly stirring during use. The high-temperature-resistant modified polyfunctional epoxy matrix resin provided by the invention has the advantages of high room temperature tensile shear strength, high heat resistance, wide application prospect in the fields such as electronics, micro-electronics, printed circuit boards (PCB), motors, aerospace and the like, simple preparation process, low cost and contribution to realizing industrial production.

The invention relates to a preparation method of high temperature resistant single-component solventless epoxy adhesive. The method comprises the following steps: adding aromatic binary primary amine and strongly polar non-proton organic solvent in a reaction tank, stirring at room temperature to dissolve, adding aromatic binary acid anhydride to perform refluxing and water-segregating reaction at 120-150 DEG C for 6-12h, cooling, adding the reaction solution in a stamp tank with precipitant to precipitate solid powder, namely white thermoplastic polyimide powder, adding white thermoplastic polyimide powder and tertiary amine compound or imidazole compound in epoxy resin to react for 1-2h, adding active diluent and latent curing agent to stir evenly and obtaining the product. The production process is easy and the cost is low so as to realize industrialized production; the tensile shear intensions of the epoxy adhesive at room temperature and 120 DEG C are respectively up to 28Mpa and26Mpa and the epoxy adhesive has broad application prospect in fields such as electronics and microelectronics, electrical motors, aviation and aerospace and the like.

The invention relates to an inorganic/organic nano particle compound modification epoxy resin adhesive and a preparation method thereof, aiming at solving the problem that the existing toughened epoxy resin adhesive has low bonding strength at high temperature and poor high temperature aging performance. The preparation method comprises the following steps of: firstly preparing an epoxy resin component, and then preparing a curing agent component, thereby obtaining the inorganic/organic nano particle compound modification epoxy resin adhesive. When the adhesive is used, the epoxy resin component and the curing agent component are mixed uniformly at normal temperature, tensile shear strength of the adhesive at 150 DEG C can reach 10MPa-15MPa, the tensile shear strength of the adhesive at 250 DEG C still can reach 4MPa-5MPa, the bonding strength at high temperature is high, after ageing for 1000 hours at 150 DEG C, the retention rate of the tensile shear strength of the adhesive still can be above 80%, the high temperature ageing property of the adhesive is good, the preparation method of the adhesive is simple and is applicable to the fields of aviation, aerospace, mechanical automation, automobile and the like.

The invention relates to a tensile-shearing test system for rock experiments in mechanics and belongs to the technical field of geotechnical engineering. The test system comprises a counter-force device, a vertical load system, a horizontal load system, upper and lower shearing boxes, a measurement system and a base, wherein the vertical load system and the upper shearing box are connected through a tensile plate of which the lower end is provided with two guide slots. The direct shear test for the rock under different tensions can be performed; due to the assembled design of the upper and lower shearing boxes, the rock sample can be conveniently adhered and detached; due to the design mode of the tensile plate and the upper shearing box, free deformation of the rock in the horizontal direction under the horizontal thrust can be guaranteed, and the stability of the horizontal load system under the tensile action can be guaranteed according to the roller row which is arranged in the horizontal load direction. The current situation that the strength criterion of the rock can only be researched by employing the compression shear experimental mode at present is changed, the intensity parameters of the rock under the action of different normal tensions can be provided, and the constitutive relation of the rock under the shear-resistant stress is improved and perfected.

The invention relates to a test loading device, in particular to a tensile-shear test loading device with a flight structure. Compression bars are arranged between stand columns, the upper ends of the compression bars are extended to form an upper beam, a compression plate is arranged on the top ends of the stand columns, a lower beam is arranged on the bottom ends of the stand columns, an upper cross type joint is arranged between the compression bars on the bottom end of the upper beam, a lower cross type joint is arranged on the upper end of the lower beam between the compression bars; and a fixture is arranged between the upper cross type joint and the lower cross type joint. The test loading device provided by the invention can be used for converting pressure of a compression tester into tensile of a test piece or realizing shear force of the test piece through the action of the fixture, and can be used for a tensile or shear test of stiffened wall plates and similar structures without being provided with a special large loading tensile testing machine independently.

Moisture curable adhesives of high tensile shear strength contain an alkoxysilyl-terminated polymer and an alkoxy-functional silicone resin.

The invention discloses a novel acrylate structure adhesive and a preparation method thereof. The two-component acrylate structure adhesive comprises components A and B, wherein the volume ratio of the component A to the component B is (10-2):1; the component A comprises 55 to 75 parts of acrylate monomer, 0 to 25 parts of toughening agent, 10 to 35 parts of oligomer, 0.1 to 5 parts of reducing agent, 0.1 to 2 parts of stabilizer, and 0.1 to 10 parts of aids; and the component B comprises 15 to 50 parts of oxidant, 15 to 25 parts of toughening agent, 15 to 50 parts of plasticizer, and 0.1 to 10 parts of aids. Compared with the conventional acrylate adhesive (SGA), the novel acrylate structure adhesive prepared by the method has the advantages that under the condition of guaranteeing the same tensile shear strength, the elongation at break is over 30%, which is much higher than the 5% of elongation at break of common acrylate adhesives available in the market.

The invention relates to the technical filed of acrylate adhesives. A bi-component acrylate adhesive comprises two components of A and B with equal proportion, wherein, the component A comprises the following components calculated by mass percentage: (a) 40 percent to 80 percent of acrylate monomer comprising at least one vinyl; (b) 0 percent to 20 percent of methacrylic acid; (c) 0 percent to 50 percent of prepolymer; (d) 0 percent to 40 percent of elastomer; (e) 0 percent to 40 percent of toughened resin; (f) 0.01 percent to 3 percent of stabilizer; (g) 0 percent to 5 percent of thixotropic agent; and (h) 1 percent to 5 percent of peroxide; and the component B comprises the following components calculated by mass percentage: (a) 50 percent to 90 percent of acrylate monomer comprising at least one vinyl; (b) 0 percent to 10 percent of methacrylic acid; (c) 0 percent to 40 percent of elastomer; (d) 0 percent to 50 percent of prepolymer; (e) 0 percent to 40 percent of toughened resin; (f) 0 percent to 5 percent of thixotropic agent; and (g) 1 percent to 10 percent of accelerant. The adhesive has higher viscosity, larger thixotropic index, and good tensile-shear strength and shearing-impact strength, thereby being convenient for application when in use and not easy to flow after application, and meeting the adhesive requirements and effects of elevation or places with larger gaps.

The invention relates to an organosilicon-epoxy-polyimide adhesive and a preparation method thereof. The organosilicon-epoxy-polyimide adhesive includes A component and B component, the A component is prepared by N, N', N'-quadri-glycidyl-4, 4'-diaminodiphenyl methane epoxy resin, carboxyl polyimide resin, alicylic epoxy resin and amino-terminated organosilicone, the B component is prepared by 2, 2-bi(4-(2,4-diaminobenzene epoxide) phenyl) propane. The preparation method of the organosilicon-epoxy-polyimide adhesive includes: only mixing the A component and the B component uniformly when in use. The organosilicone-epoxy-polyimide adhesive is fine in heatproof performance, simple in preparation process and free of solvent and has environment protection effect, and tensile shearing strength is up to 31.2MPa.

This invention relates to one pulling and pressing shearing test device and structure force test device, which comprises the following parts: four pieces of shearing and pulling and pressing loading boards; one rectangle loading frame; two L-shape lever symmetrically hinged with each other and fixed on the rectangle loading frame one catercorner, wherein the L-shape lever is separately loaded with pulling and pressing holes. The test device can realize the compound test on the same one test device of general test machine.

The invention relates to the technical field of preparation of a bimetallic composite plate, in particular to a method for strongly deforming and rolling a bimetallic composite plate, and aims to solve the technical problems of low bonding strength, large residual stress and serious warpage in an existing bimetallic plate rolling method. According to the technical scheme, a manufactured bimetalliccomposite plate blank is subjected to two passes of rolling, a wave plate rolling mill is adopted for the first pass, the upper roller is a crossed corrugated roller, and the lower roller is a flat roller; and a flat roller mill is adopted for the second pass, and the upper roller and the lower roller are all flat rollers. According to the rolling method, the composite plate with good comprehensive performance of the tensile shear strength and tensile strength in the rolling direction and the transverse direction is obtained, and the residual stress distribution inside the bimetallic composite board can be obviously improved; and by adopting the novel process for rolling the bimetallic composite plate, the bonding strength of the two plates can be improved, the residual stress distribution state is improved, and the plate warpage is reduced.

The invention relates to a production tooling for adhesive tensile shear strength test samples. The production tooling comprises a base, a pressurization system and a cushion block, wherein the base consists of a bottom plate, a left groove, a right groove, a left upright post and a rear upright post; the pressurization system consists of a beam and a pressurization device; the pressurization device consists of a pressurization plate, a reset spring and a pressurization threaded rod; the thicknesses of the cushion blocks are the sums of the substrate thicknesses and the adhesive layer thicknesses of the test samples. According to the production tooling, the overlapping length of the test samples can be accurately controlled; in addition, the parallelism and the coaxiality of the test samples can be ensured; moreover, multiple test samples can be prepared at one time according to a requirement.

The invention provides a porous material structure having a three-dimensional negative Poisson's ratio. The porous material structure comprises a plurality of net structures which are sequentially stacked in parallel along a Z-axis direction, and the upper net structure and the lower net structure which are adjacent are connected by a support ligament, wherein net structure extends along an XOY plane. The porous material structure having the three-dimensional negative Poisson's ratio eliminates the tensile-shear coupling effect of the two-dimensional substructure of the XOY plane during deformation, so the three-dimensional structure constitutive relationship usually is orthotropic, and can be easily designed and analyzed. Geometrical dimensions are adjusted to make the structure isotropicand greatly change the negative Poisson's ratio values in all three directions, so the choice of practical applications is increased.

The invention relates to a damping package material of epoxy resin group, which consists of component A and component B, wherein the component A is composed of 0-90 parts of bisphenol A epoxy resin, 0-60 parts of polyurethane epoxy resin, 20-90 parts of flexible epoxy resin according to part by weight, the component B is composed of 25-55 parts of aliphatic amine, 10-45 parts of aliphatic cyclic amine, 0-80 parts of versamid and 0-8 parts of silane coupling agent according to part by weight, the parts are mixed uniformly according to part by weight of A:B=100:15-100. The invention has the advantages that the mixture has good mobility, the solidification reaction is mild, the condensate has good mechanical property and good tensile shear strength with metals, the invention can resist high and low temperature impact, thermal aging and humidity heat aging, the condensate does not erode rigid aluminium alloy, steel, aldary and PVC plastics in sealed humidity heat condition, the solidification shrinkage ratio is low, with the damping coefficient (tan delta max>=0.5). Particularly, the invention has instantaneous high impact property and the operational temperature is from -54 DEG C to 70 DEG C.

The invention discloses an intermediate frequency spot welding method for an aluminum alloy and zinc-plated high-strength steel dissimilar material and belongs to the technical field of metal material welding. According to the intermediate frequency spot welding method, spot-welding electrodes are adopted for welding aluminum alloy and zinc-plated high-strength steel. The side of the aluminum alloy is provided with the radius tip electrode with the diameter of 30-100 mm, and the side of the zinc-plated high-strength steel is the flat electrode with the diameter of 8-15 mm. According to the intermediate frequency spot welding method, generation of splashing can be reduced in the spot welding process, and adhesion of a workpiece and the electrodes and an alloying reaction are prevented. Meanwhile, the size of a spot-welding nugget on the side of the aluminum alloy is increased, the growth behavior of an intermetallic compound on the interface of the aluminum alloy/zinc-plated high-strength steel is controlled, and generation of fragile FexAly intermetallic compound is reduced. The performance of an aluminum alloy and zinc-plated high-strength steel dissimilar material intermediate frequency spot-welded connector obtained through optimization of the technological parameters of resistance spot welding is significantly improved, and the tensile shearing force of the spot-welded connector can be as high as 5400 N. The thickness of the intermetallic compound on the interface of the aluminum alloy/zinc-plated high-strength steel is controlled to be below 5.0 [mu]m.

There are provided a flux-cored wire for welding different materials, a method for laser welding of different materials and a method for MIG welding of different materials which can improve tensile shear strength of a welded joint portion and peeling strength of a welded portion interface in welding aluminum or an aluminum alloy material and a steel material. The flux-cored wire has a cylindrical sheath comprising an aluminum alloy which contains Si in an amount of 1.5 to 2.5% by mass and Zr in an amount of 0.05 to 0.25% by mass, with the remainder being aluminum and inevitable impurities, and a flux filling inside this sheath and containing cesium fluoride in an amount of 20 to 60% by mass, and the packing fraction of the flux being 5 to 20% by mass of the total mass of the wire.

The invention discloses a heat-resistant coating tensile shear strength test model which comprises an upper sheet metal, a lower sheet metal, an intermediate adhesive layer, fiber cloth in the adhesive layer and paper adhesive tapes pasting around tensile shear adhesive surfaces of the sheet metals. A production method provided by the invention comprises adding the fiber cloth into the adhesive layer, thereby effectively controlling thickness and uniformity of the adhesive layer; and is added with a process of pasting paper adhesive tapes around the tensile shear adhesive surfaces, thereby reducing influences of irregular glue-spilling on test results, and improving stability of the test results.

The invention relates to an epoxy modified polyurethane double-component grouting material for road engineering maintenance and a preparation method thereof, wherein the grouting material comprises a component A and a component B; the component A comprises following components in part by weight: 700-800 parts of polyether glycol, 100-300 parts of epoxy resin addition product, 20-40 parts of foaming agent, 40-80 parts of foam stabilizer and 10-40 parts of catalyst; and the component B is polyphenyl polymethylene polyisocyanate. The preparation method comprises the step of mixing and stirring the component A and the component B according to the mass ratio of (0.8-1.5): 1 uniformly. The grouting material has the advantages that: when the material participates in foaming reaction and is cured, the compression strength and bonding force of the formed liquid cement are improved, and the maximum tensile shear strength can reach 4.3Mpa, so that the grouting material is better than the grounding material mixed by polyurethane and epoxy resin; and the grouting material reduces builder body damage and has a certain economic benefit.

The invention discloses damping glue for a vibration reducing plate and a preparation method thereof. The component formula of the damping glue is as follows: 3 to 10 parts of nitrile-butadiene rubber 26 (NBR 26), 5 to 7 parts of nitrile-butadiene rubber 40 (NBR 40), 2 to 4 parts of additive, 2 to 12 parts of epoxy resin (EP), 1 to 5 parts of phenol formaldehyde resin (PF), 1 to 2 parts of curingagent, 0.3 to 0.5 part of peroxide, 0.5 to 1 part of zinc oxide, and 65 to 75 parts of solvent. The preparation process of the damping glue is as follows: the NBR 26 is firstly plasticated on a double-roll machine for 5 to 10 minutes, and then the zinc oxide is added and mixed with the NBR26 until the Williams plasticity is between 0.2 and 0.3; then the NBR40 is plasticated on the double-roll machine until the Williams plasticity is between 0.3 and 0.4; the mixed material is added to the solvent being stirred and stirred until being completely dissolved; and afterwards, the PF, the additive, the EP or a compound thereof, the curing agent and the peroxide are stirred until being completely dissolved into an evenly thick liquid, and then the normal-temperature damping glue for the vibrationreducing plate can be acquired. The main performances of the manufactured damping glue are as follows: the solid content is 25 to 35 percent; the glue solution viscosity (measured by a rotational viscometer) is 3.5 to 7 Pa.S (25 DEG C); the T-peel strength is larger than 20N/cm; the tensile shear strength is larger than 7MPa; tangent Delta is larger than or equal to 0.20; and the temperature range is minus 10 DEG C to 75 DEG C.