268 results about "Interfacial shear" patented technology

One embodiment of the invention comprises a differential composite in which bone cement everywhere or substantially everywhere contains at least some non-zero volume fraction of particles, and in which the local volume fraction of particles may vary from place to place in the composite in a controlled manner. The variation may be by identifiable region or may be in the form of a gradient of the local volume fraction of particles. In at least some places, the local volume fraction of particles may be such that the particles act as crack arrestors. Close to the interface with natural bone, the local volume fraction of particles may be greater. In at least some places adjoining natural bone, the local volume fraction of particles may be such as to allow bone ingrowth into appropriate region(s) of the composite, resulting in improved interfacial shear strength. Methods and apparatuses for producing and delivering the composite are also disclosed, which may include use of an introducer and an expandable basket-type device.

A method for preparing a graphene oxide grafting surface modification carbon fiber relates to a carbon fiber modification method, and is used for solving the technical problems that the existing carbon fiber has low surface activity, reduced surface tension and poor wettability with a resin matrix, and the interlaminar shear strength of a composite material is caused to reduce. The method comprises the steps as follows: 1, graphite oxidization; 2, separation of graphite oxide mother liquor; 3, functionalization of graphite oxide; 4, carbon fiber surface functionalization; and 5, carbon fiber surface graphite oxide treatment. The graphite oxide uniformly covers the carbon fiber surface, the roughness of the carbon fiber surface can be greatly improved, and accordingly, the interfacial properties of a carbon fiber reinforced composite material can be improved by an anchoring action. The interfacial shear strength of the surface grafting graphene oxide carbon fiber/carbon composite material which is prepared through graphene oxide grafting modification can be improved by 25% in comparison with that of the untreated surface grafting graphene oxide carbon fiber/carbon composite material.

The invention discloses a multifunctional tilt table device used for testing the interfacial shear strength characteristics of a geotechnical synthetic material. The multifunctional tilt table device comprises a testing stand, an inclined plane control mechanism, a shearing box unit, a vertical loading mechanism and a measurement and control system, wherein the inclined plane control mechanism drives a tilted plate of the testing stand through a motor so as to allow the tilted plate to rotate to any inclination angle and can fix the tilted plate at a certain inclination angle through hydraulic jacks, shearing boxes are placed on concave guide rails on the surface of the tilted plate, a geotechnical synthetic material sample is installed between upper and lower shearing boxes, multiple layers of inclined shearing interfaces are formed through rotation of the tilted plate, the vertical loading mechanism comprises two loading devices used for short-term and long-term characteristic testing of the interfaces, the measurement and control system composed of a sensor, a control and acquisition system and a computer carries out real-time monitoring on stress and displacement of the upper and lower shearing boxes and the sample, determines a critical interface instability inclination angle according to displacement and pull-up curve abrupt change points and calculates shear strength of each interface according to stress analysis. The multifunctional tilt table device can be used for short-term and long-term characteristic testing of a single layer or multiple layers of interfaces.

The present invention discloses a post-processing method for steel-back aluminum-base semisolid composite plates and relates to the post-processing research field of interfacial mechanical characteristic of steel-back aluminum-base semisolid composite plates. At room temperature, a steel-back aluminum-base semisolid composite plate is rolled with the reduction rate of 0.5-1.6 percent on a precision rolling mill, and the difference between shrinkages of the aluminum-base coating and the steel base in the coagulating and cooling process of the composition is redeemed by the difference between the deformation of the aluminum-base coating and the steel base produced in the rolling process, thereby, reducing the additional interfacial stress of the composite plate, simply and conveniently improving the interfacial shear strength of the composite plate, and solving the technical problems of large energy consumption and small increase amplitude of interfacial shear strength in post-processing method of diffusion annealing of aluminum-base semisolid composite plates.

A preparation method of a carbon fiber reinforcement grafted by graphene oxide relates to a preparation method of a carbon fiber reinforcement grafted by graphene oxide. The invention solves the problems of harsh process conditions, long process period, toxic process, and difficult industrial production for current carbon fiber surface modification methods. The invention adopts a 'grafting' method, and grafts graphene oxide on acidified carbon fiber surfaces through an acylation reaction by using polyamide-amine with a lot of amido active groups; the invention has low cost, is simple, practical, environment-friendly, and nontoxic, and can be completed within a short period. The method particularly comprises the following steps: mixing acidified carbon fibers and a polyamide-amine methanolsolution, reacting to prepare carbon fibers modified by polyamide-amine, adding the prepared carbon fibers in a graphene oxide acetone suspension, mixing, reacting, filtering, drying the precipitatestill the weight is constant. The obtained carbon fiber reinforcement has interfacial shear strength with epoxy resin of up to 79.77-105.50 MPa which is improved.

A force sensor includes a polymeric substrate including a cavity with a tilt plane, at least two metal piezoresistors on the tilt plane, and a contact pad connected to the metal piezoresistors. The tilt plane may include a measured interface of from 15° to 75°.

The invention relates to an explosive welding forming method of magnesium and aluminum alloy composite plates. The explosive welding is performed according to the performance requirements of the magnesium and aluminum alloy composite plates, ammonium nitrate fuel oil mixture is adopted, and long-distance instantaneous explosive form is performed on a ground sand base. The welding method is high in forming speed, welding line is firm and is good in metallographic structure compactness, the combined rate is up to 99.5%, the interfacial shear strength is 120MPa, on the premise of strict operation, the welding process is safe and reliable, and the method is reliable and effective in magnesium and aluminum alloy composite plate production.

Disclosed are a compact device for testing the interfacial shear strength of a composite material and a method for testing the interfacial shear strength of the composite material through the device. The invention relates to the device and method for testing the interfacial shear strength of a composite material. An object of the invention is to solve the problems that a conventional micro-debonding test device which is unique for pure quantitative detection of the interfacial shear strength of an actual to-be-tested composite material sample is hard to be integrated in a low-temperature environment chamber because of the over size and cannot be used for testing the interfacial shear strength of a composite material in a low-temperature environment. The device comprises a fixed pedestal, a micro-extension test system, and a microsphere holding system. The method comprises: 1, preparation of a sample for an interfacial shear strength test; 2, interfacial shear strength test; and 3, calculation of the interfacial shear strength tau of the composite material according to a formula defined in the description. According to the invention, the compact device for testing the interfacial shear strength of a composite material and the method for testing the interfacial shear strength of the composite material through the device are obtained.

The invention relates to an explosive welding forming method for a magnesia-alumina-titanium alloy composite board, which is performed aiming at the performance requirements of a magnesium alloy board, an aluminum alloy board and a titanium alloy board; an ammonium nitrate fuel oil mixture is adopted for performing remote instant explosive welding forming on a sand substrate on the ground; the welding forming method is quick in speed, firm in interface bonding, good in interfacial shear strength and high in boding rate; the magnesia-alumina-titanium alloy composite board achieves the shear strength of 150MPa, the explosive welding bonding rate is 96.8%, the controllability is good, the welding process is safe and reliable, and thereby the explosive welding forming method is a reliable and effectively method for preparing the magnesia-alumina-titanium alloy composite board.

An oil scavenge system includes a tangential scavenge scoop and a settling area adjacent thereto which separately communicate with a duct which feeds oil into an oil flow path and back to an oil sump. A shield is mounted over the settling area to at least partially shield the collecting liquid oil from interfacial shear. A multiple of apertures are located through the shield to permit oil flow through the shield and into the duct. The scavenge scoop forms a partition which separates the duct into a first portion and a second portion. The first portion processes upstream air/oil mixture that is captured by the tangential scoop while the second portion receives the oil collected in the settling area.

The invention provides a preparation method of a carbon nanotube-carbon fiber mixed enhanced epoxy resin composite material. The preparation method comprises the following steps: carrying out modification treatment on surfaces of carbon fibers; preparing a sizing agent of carbon-containing nanotubes; preparing a carbon nanotube-carbon fiber enhanced body; preparing a carbon-containing nanotube enhanced epoxy resin matrix; and preparing the carbon nanotube-carbon fiber mixed enhanced epoxy resin composite material and the like. Compared with a traditional carbon fiber enhanced epoxy resin composite material, the carbon nanotube-carbon fiber mixed enhanced epoxy resin composite material has the advantages that the mechanical properties are obviously improved; and the interfacial shear strength is improved by 34 to 42 percent and the inter-laminar shear strength of the composite material is improved by 31 to 34 percent. The preparation method of the composite material, provided by the invention, has the advantages of simple molding technology, excellent mechanical properties and the like.

A method and apparatus for the evaluation and improvement of the mechanical and thermal properties of carbon-nanotube (CNT) and carbon nanofiber (CNF) arrays grown on a substrate is disclosed. The Young's modulus of a CNT/CNF material is measured by applying an axial compressive force on the CNT/CNF array and measuring the applied forces and the induced displacements. Also disclosed are the evaluation of the nonlinear stress-strain relationship of the CNT/CNF material, increasing of the Young's modulus and decreasing the thermal resistance by application of a compressive load, the application of rapid thermal annealing to improve the quality of the CNT/CNF material and to reduce the interfacial thermal resistance, improvement of the bonding strength of the CNT/CNF array to a substrate, evaluation of the bonding strength of the CNT/CNF array to a substrate, evaluation of the shearing force at failure, and an analytical stress model that enables one to predict the interfacial shearing stress from the measured force.

The invention provides a method for modifying a carbon fiber surface by assembly of aromatic fused ring molecules and belongs to the technical field of carbon fiber modification. The method comprisesthe following steps: aromatic fused ring dianhydride and diamine are subjected to imidization, and an aromatic fused ring imide molecule assembly liquid is obtained; carbon fibers are soaked in the aromatic fused ring imide molecule assembly liquid, the aromatic fused ring imide molecules are combined with the carbon fibers, and the carbon fibers with surfaces subjected to assembly modification are obtained. Chemical activity of the surfaces of the carbon fibers can be improved with the modification method. The invention further provides a preparation method of a carbon fiber interface reinforced resin matrix composite. The obtained carbon fibers with the surfaces subjected to assembly modification are compositely cured with resin, and the aromatic fused ring molecule assembly-modified carbon fiber interface reinforced resin matrix composite is obtained. The interface reinforced resin matrix composite obtained with the preparation method has good interfacial adhesion strength and interfacial shear strength.

The invention discloses a method and device for a shearing test on the interface between the steel bridge deck and the pavement layer, and relates to the technical field of highway steel bridge deck pavement. The technical scheme includes the following key points: the test method includes test piece manufacture, heat preservation of the test piece, shearing test, and deduction of the relationship between the shearing stress and shearing strain of the interfacial layer according to the linear strain measured using a strain gage on the test piece. The invention also discloses a device for realizing the test method, and the device includes a material testing machine and a console; an environmental chamber is arranged on the inner side of the material testing machine; a loading rod, a three-point loading mold and a support platform are arranged on the inner side of the environmental chamber; in the working state, the test piece is placed between the three-point loading mold and the support platform. The test method and device, provided by the invention, are compatible with various experimental conditions; in addition, the device for the shearing test on the interface between the steel bridge deck and the pavement layer is simple in structure; the testing method is easy to operate, can accurately measure the shearing strain under different shearing stress conditions, and provides basis for the studying on shearing characteristics of the interface in a nonlinear bonding and slipping state.

The invention relates to a roll-bonding process for semisolid copper-lead bearing alloys/steel bimetals. The weight content percentage of the lead in the copper-lead bearing alloy is 10.0 to 30.0%. In order to refine the crystalline grain of the lead and improve the mechanical property of the alloy, sulfur, tin, nickel, manganese, rare earth and other the third alloy elements can be added in the copper-lead alloy. The process comprises four steps: pretreatment of steel plates, preparation of semisolid sizing agent, roll bounding and water cooling. The detailed process comprises the following steps: performing mechanical agitation to the melted copper-lead bearing alloys at 930 to 1050 DEG C to obtain the semisolid sizing agent; pouring the semisolid sizing agent on the pretreated steel plates; synchronously feeding the semisolid copper-lead bearing alloys and solid steel plates in to a mill for rolling; spraying water for cooling to obtain the bimetallic composite plate. The invention effectively overcomes the defect of lead segregation in the production of the copper-lead bearing alloys in the prior art, therefore, metallographic structure with fine lead particle and even distribution is obtained. According to mechanical test results, the interfacial shear strength of the copper-lead bearing alloys/steel bimetallic slabs prepared using the process is more than 60Mpa, increased by about 10Mpa.

The invention discloses a method for efficiently preparing a carbon fiber-grafted polymer and relates to a carbon fiber surface modifying method. The invention aims to solve the problems of high energy consumption, environment pollution, low grafting degree, serious damage to the main bodies of carbon fibers, and low interfacial strength of the modified carbon fibers of the current carbon fiber modifying method. The method comprises the following steps of 1, extracting the carbon fibers; 2, oxidizing the carbon fibers; and 3, grafting PEI (Polyetherimide) to the carbon fibers to obtain the carbon fiber grafted polyethyleneimine. Content of nitrogen element of the carbon fiber-grafted polyethyleneimine prepared by the method is up to 15.51 to 17.84 percent; compared with the carbon fibers, the carbon fiber-grafted polyethyleneimine prepared by the method is obviously improved in interfacial shear strength, and the interfacial shear strength is improved to 73.7MPa to 89.6MPa from 48.8MPa of the carbon fibers and is improved by 51 to 83.6 percent. An efficient carbon fiber-grafted polymer can be obtained by the method.

The invention relates to a device and method for testing interfacial shear strength of fiber reinforced thermosetting resin composite materials. The device comprises a resin die, support plates, hollow screw rods, sleeves, spring clips, and a bottom support plate; the hollow screw rods and the support plates are connected in rigid connection, the sleeves and the hollow screw rods are connected through internal screw threads, the support plates are vertically placed on the bottom support plates and fixed with screws, the resin die is embedded in the middle part of the support plates and is placed on the bottom support plate, a fiber is introduced to pass through the hollow screw rod and impale a wall of the resin die by a steel needle, a certain length of the fiber is embedded, and the spring clip clamps a free end of the fiber outside the sleeve. The testing method is based on single fiber pull-out technology, and the method comprises the following steps: fibers are embedded into the resin die, and the embedding length is regulated; resin is cast in order to prepare a testing sample; demoulding is carried out for a single fiber pull-out test, and the interfacial shear strength of the composite material is calculated. The device has a simple structure, and can be used for solving difficulties of sample preparation for the single fiber pull-out test of fiber and the like; the interface test method is convenient and rapid to operate.

A method for modification of carbon fiber surface by use of a metal organic framework belongs to the field of composite material interfacial modification. By combination of a new metal organic framework nanomaterial, a new carbon fiber surface modification method is provided, the main purpose is to solve the problem of carbon fiber body strength loss while improvement of carbon fiber surface energy of carbon fiber surface modification methods in the prior art. The preparation process is as follows: first, cleaning carbon fiber surface; second, pretreating the cleaned carbon fiber surface; third, grafting the pretreated carbon fiber surface with metal organic framework UiO-66-NH2; and fourth, ultrasonically processing the modified carbon fiber. Interfacial shear strength of the composite material prepared from the carbon fiber and epoxy E51 is increased by 44%, meanwhile the tensile strength of the carbon fiber is increased by 25%, and the composite material is used in aerospace, automotive, transportation, construction, chemical engineering and other fields.

The invention discloses a preparation method of silane coupling agent assisted electrophoresis deposition initiated graphene oxide modified carbon fibers. The preparation method comprises the following steps: placing desized carbon fibers into an aqueous solution which contains amino propyl triethoxysilane (APTES) and ethanol for hydrolysis amination pretreatment to obtain carbon fibers treated bya silane coupling agent, connecting the carbon fibers treated by the silane coupling agent to a positive electrode of a power supply, connecting a copper sheet to a negative electrode of the power supply, and performing electrophoresis deposition by a graphene oxide aqueous solution used as an electrophoresis deposition solution to obtain the silane coupling agent assisted electrophoresis deposition initiated graphene oxide modified carbon fibers. The preparation method can effectively enhance the interfacial shear strength of a carbon fiber enhanced resin-based composite material, and can beapplied to a surface modification process of homemade carbon fiber.

The invention relates to a modification method of a PBO (polyparaphenylene benzobisoxazole) fiber, in particular to a graphene nanoribbon interface-modified PBO fiber and a preparation method thereof, aiming at solving the problem that the existing modification method of the PBO fiber enables the tensile strength of a PBO fiber body to be greatly reduced. The structure of the graphene nanoribbon interface-modified PBO fiber is described in the description. The preparation method comprises the steps of 1, preparing a graphene nanoribbon; 2, treating the graphene nanoribbon by carboxylation; 3, treating the surface of PBO by carboxylation; 4, using the carboxylic graphene nanoribbon interface-modified PBO fiber to obtain the graphene nanoribbon interface-modified PBO fiber. Compared with the untreated PBO fiber, the tensile strength of the modified PBO fiber is only reduced by 5-10 percent; compared with an epoxy resin composite material prepared by the unmodified PBO fiber, the interfacial shear strength of an epoxy resin composite material prepared by the modified PBO fiber is improved by 20-41 percent. The graphene nanoribbon interface-modified PBO fiber can be taken as a reinforcing material for preparing composite materials.

The invention discloses a method for improving the interfacial shearing performance of a fiber-resin composite under a high temperature condition. The method comprises the following steps: fully infiltrating selected fibers with at least a resin solution and then carrying out drying so as to obtain the fiber-resin composite; and coating the fiber-resin composite with resin and curing the resin. Compared with the prior art, the method provided by the invention can effectively improve the interfacial shearing performance of the porous fiber-resin composite under the high temperature condition, is simple in process, easy to operate, low in cost, convenient for large-scale implementation, and has good application prospects. The invention also discloses a testing method for the interfacial shearing performance of fiber-resin composite under the high temperature condition. The testing method has the advantages of easiness in implementation, good stability, good accuracy, etc.

The invention discloses a meridian aircraft tire capable of reducing interface shear stress and improving bead durability. The tire is characterized in that one layer of transition glue is arranged at a bead part and positioned on the outer side of a carcass ply, is 2-4 mm in thickness, and is 60-70 degrees in shore hardness; two layers of buffer fiber cord ply are arranged outside the transition glue; the density of cord threads is 35-90 piece/100 mm; the included angles between the cord threads and the peripheral direction are 20-90 degrees; and warps of the two layers of fly are across arranged corresponding to the radial direction. The improved meridian aircraft tire can reduce interface stress, strain and themogenesis between the carcass at the bead part and the rubbers at the outer side, and can improve the bead durability by more than 80% under the rigorous conditions; and the dynamic performance of the tire can meet the requirements of airworthiness standard (GJB683A).

The invention discloses a preparation method of an organic amine-TiO2 nanowire/carbon fiber multiscale reinforcement and relates to a preparation method of a carbon fiber multiscale reinforcement. The invention aims at solving the problem that the conventional carbon fiber composite material is low in interface bonding strength. The method comprises the following steps: firstly, cleaning; secondly, oxidizing; thirdly, carrying out acyl chlorination; fourthly, grafting carbon fibers to PEI (Polyether Imide) in supercritical methanol; fifthly, preparing TiO2 sol; sixthly, preparing the carbon fibers of which the surfaces contain TiO2 thin films; seventhly, grafting to obtain the organic amine-TiO2 nanowire/carbon fiber multiscale reinforcement. Compared with a protofilament, the organic amine-TiO2 nanowire/carbon fiber multiscale reinforcement prepared according to the preparation method disclosed by the invention has the advantage that the interfacial shear strength is improved by 88.6 to 92.1 percent. The preparation method disclosed by the invention is a preparation method of the organic amine-TiO2 nanowire/carbon fiber multiscale reinforcement.