93 results about "Interfacial shear" patented technology

The invention discloses a high-thermal-conductivity graphene fiber composite material based on conjugate interface adaptation and a preparation method thereof, and relates to the technical field of fiber composite materials. According to the method, a conjugated interface conformation adaptive design of an interface phase is realized by utilizing a functionalized phenylsilane coupling agent through active sites of topological wrinkles on the surface of a graphene fiber, and a molecular conjugated interface layer with an efficient heat conduction path and a strong mechanical interlocking effect is formed. According to the graphene fiber / epoxy resin composite material treated by the method, the interfacial shear strength can reach 90 MPa, the in-plane heat conductivity coefficient reaches up to 550 W / mK, and the performance retention rate exceeds 98% after 100 times of thermal shock cycles. By regulating and controlling the adaptability of the fiber surface wrinkle structure and the interface molecule conformation, the problem that a traditional carbon fiber modification method is insufficient in applicability on graphene fibers is solved, the thermal and mechanical property synergistic effect of the graphene fiber composite material is remarkably improved, and the graphene fiber composite material is suitable for a stable advanced thermal management system in an extreme thermal environment.

The invention provides an anti-aging resin core rod for a composite insulator and a preparation method of the anti-aging resin core rod, the anti-aging resin core rod comprises modified glass fibers and an epoxy resin sizing material, and the modified glass fibers are obtained by modifying glass fibers through imidazolium-phosphate; the epoxy resin sizing material comprises the following raw materials in parts by mass: 100 parts of epoxy resin, 70-90 parts of an anhydride curing agent and 0.1-1 part of a curing accelerator. An imidazolium-phosphate interface layer is introduced to the surface of the glass fiber and is matched with an anhydride cured epoxy resin system, so that the bonding performance of a fiber / resin interface can be remarkably improved, the shear bearing capacity of the interface is improved, and the attenuation of the interface strength in a humid and hot environment is effectively inhibited; and the core rod material can still keep higher interface bonding stability and mechanical bearing performance under a long-term hydrothermal condition.

The invention discloses a functional osteochondral repair material which comprises a cartilage layer, a transition layer and a bone layer which are sequentially connected, the cartilage layer takes hyaluronic acid, I-type collagen and chitosan as base materials, the transition layer takes hydroxyapatite and a polylactic acid-glycolic acid copolymer as base materials, and the bone layer takes hyaluronic acid, I-type collagen and chitosan as base materials. The bone layer takes beta-tricalcium phosphate, hydroxyapatite and a polylactic acid-glycolic acid copolymer as base materials, the invention relates to the technical field of medical biological materials, by designing the organic-inorganic composite transition layer, the gradient connection cartilage layer and the bone layer, and the interfacial shear strength is greater than or equal to 0.5 MPa, the problem of interlayer stripping of a traditional layered material is effectively solved, and the medical material has the advantages of high mechanical strength, high mechanical strength and high mechanical strength. According to the selective laser sintering 3D printing material, the shearing stress and the compression stress during joint movement can be borne, mature medical material production equipment such as freeze drying, compression molding and sintering is adopted in the preparation process, large-scale batch production can be achieved, meanwhile, personalized preparation of selective laser sintering 3D printing is supported, and the requirements of different clinical scenes are met.

The application discloses an automatic testing system for single-fiber interfacial shear strength, which comprises a single fiber with a resin drop, a clamp assembly for vertically fixing the single fiber and stretching the resin drop, and a testing system for detecting the single-fiber interfacial shear strength; the clamp assembly comprises a fixing frame for fixing two ends of the single fiber and movable along the direction of a single-fiber fixing shaft, and a pair of cutters located on both sides of the connection between the fiber and the resin drop; the testing system comprises a resin drop length acquisition module, a shearing force acquisition module, a motion control module and a calculation module. The application further provides an automatic testing method. The system provided by the application can effectively improve the detection accuracy and efficiency of the single-fiber interfacial shear strength.

The present invention provides a hot-rolled steel sheet for building structures, comprising a base layer, a corrosion-resistant layer, and an interfacial transition layer located between the base layer and the corrosion-resistant layer. The hot-rolled steel sheet of the present invention has a yield strength of ≥350 MPa, a tensile strength of ≥490 MPa, a yield-to-tensile ratio of 0.71 to 0.80, an impact energy of ≥190 J at -40°C, a corrosion resistance rate of ≤0.006 mm / year from sea spray, an interfacial transition layer thickness of ≤10 μm, and an interfacial shear strength of ≥252 MPa, and can be used to manufacture structural components suitable for sea spray environments. The present invention also provides a method for manufacturing the hot-rolled steel sheet.

This invention discloses a high-performance wood-plastic composite frame structure for building doors and windows, belonging to the field of building materials technology. The frame structure includes a wood-plastic outer wall and an internal cavity. A continuous support mesh structure composed of an array of topological units is integrally formed within the cavity. The topological units are configured with a tensile geometry exhibiting a negative Poisson's ratio effect, including multiple load-bearing members and connecting nodes. When the wood-plastic outer wall experiences axial expansion tensile strain due to heat, the topological units compensate for this displacement through node rotation and member bending, thereby significantly reducing interfacial shear stress and suppressing the arching deformation of the frame. When external fasteners are subjected to axial pull-out force, the topological units undergo centripetal contraction deformation, enhancing the frictional gripping force on the fasteners. This invention resolves thermal stress through microscopic geometric reconstruction, effectively addressing the shortcomings of poor thermal stability and insufficient nail-holding power in wood-plastic profiles.

This invention discloses a layered titanium / aluminum composite plate and its preparation method, belonging to the field of metal composite material manufacturing technology. During the rolling process, SiCp powder is sprayed into the titanium / aluminum composite plate, wherein SiCp particles with a size of 20 μm or less account for more than 95% of the powder. This invention uses pure titanium as the cladding layer and aluminum alloy as the substrate to prepare a Ti / Al layered composite plate, combining the characteristics of these two metals. It possesses both the lightweight and low cost of aluminum and the high strength and rigidity of titanium. Through reasonable process design, the SiCp powder is rolled together, significantly enhancing the bonding strength of the composite plate. The titanium / aluminum composite plate exhibits an interfacial shear strength ≥130 MPa, a tensile strength ≥280 MPa, and a bending resistance ≥10 times. Furthermore, it avoids the environmental pollution problems associated with electroplating and physicochemical coating methods. This is a titanium / aluminum metal layered composite material preparation and processing technology with excellent development potential, reducing production costs and saving social resources.

The invention relates to the technical field of fireproof heat-insulating materials, and particularly discloses a fireproof heat-insulating strip for steel doors and windows and a preparation process of the fireproof heat-insulating strip. The fireproof heat insulation strip is composed of a modified basalt fiber braided fabric and a resin material wrapping the surface of the modified basalt fiber braided fabric, and the resin material is formed by attaching a resin glue solution to the surface of the modified basalt fiber braided fabric and curing the resin glue solution. The resin glue solution is mainly prepared from the following raw materials; liquid phenolic epoxy resin, a curing agent and an organic silicon surfactant; the modified basalt fiber braided fabric is obtained by treating the basalt fiber braided fabric with sodium hydroxide, 3-(4-urea amino) propyl triethoxy silane and 3-(trimethoxysilyl) propyl 3-oxobutyrate. The fireproof heat insulation strip has the characteristics of high tensile strength, good bending strength and high interfacial shear strength, prolongs the service life, has good fireproof performance and heat insulation performance, meets the market requirements, and has commercial application prospects and economic values.

The invention discloses a cushion block composite layer for a semiconductor, a preparation method and a cushion block, the cushion block composite layer sequentially comprises a composite coating and a surface microstructure from a substrate close to beryllium copper to a position far away from the substrate, and the composite coating sequentially comprises a chromium transition layer, an alpha-diamond-like carbon layer and a self-lubricating layer doped with tungsten disulfide from a position close to the substrate to a position far away from the substrate. Hard metal carbide reinforced phase crystal grains are uniformly distributed in the alpha-diamond-like carbon layer; the surface micro-texture comprises a plurality of pits, and each pit is filled with a nano-particle solid lubricant; through the structure, the cushion block is compatible with the high process temperature, an additional cooling device is not needed, and the interface shear stress of the composite layer is reduced, so that the copper powder falling amount is greatly reduced, the hardness, the wear-resisting life, the wear-resisting particle penetrability and the high recognition accuracy of the cushion block are greatly improved, and the low friction coefficient of the surface is maintained; and the roughness is still kept at a lower level after the lead frame is carried for multiple times.

The invention discloses a fractured rock mass high-pressure grouting sample manufacturing device and an interface shear strength testing method.The sample manufacturing device comprises a permeable stone box body, a fixed rock block and a movable rock block, and the fixed rock block is installed in one side of the permeable stone box body in a sealed mode and fixed through a rigid fixing supporting body; the movable rock block is mounted in the other side of the permeable stone box body in a sliding and sealing manner and is supported by a spring group; the interface shear strength test method comprises the following steps: mounting a test part on a sample, and mounting an adjustable cushion block for adjusting the position of the sample relative to a shear gap at the bottom of the sample so as to adjust the shear position; different shearing positions of the multiple groups of samples are tested, and data are recorded respectively. According to the manufacturing device for the fractured rock mass high-pressure grouting sample, the in-situ dehydration process of slurry in the high-pressure grouting process is simulated, the slurry stone body strength in the sample and the interface bonding strength of the slurry and rock are close to the in-situ state, and non-negligible errors caused by test conditions are greatly reduced.

This application discloses a creep testing device for a fiber composite-steel interface. The device horizontally supports the specimen using a first support and a second support. A first loading mechanism applies a downward vertical force to the specimen, with the point of application located between the first end and a pre-fabricated crack. A second loading mechanism applies a downward vertical force to the specimen, with the point of application located between the second end and the pre-fabricated crack. The fiber composite-steel beam interface of the specimen primarily bears Type II interfacial shear stress caused by bending deformation, while the Type I peel stress approaches zero. This avoids the combined stress-shear + peel stress generated by direct tension in traditional lap joints, enabling the test results to accurately reflect the interface's durability under pure shear.

The invention relates to the technical field of geotechnical engineering test equipment, and provides a soil-lining interface constant pressure difference seepage-shear coupling performance test device and method.The device comprises a main controller, a sensor array used for monitoring the stress field distribution state, a data acquisition system, a shear box and a confining pressure box internally provided with a confining pressure cavity; the shear box is located in the confining pressure cavity, the bottom of the shear box is in sliding connection with the confining pressure box, shear loading devices are arranged on the top and the two opposite side faces of the shear box respectively, permeable stones are arranged on the inner top wall and the inner bottom wall of the shear box respectively, and the top and the bottom of one side of the shear box are connected with a water supply pipeline and a water drainage pipeline respectively. The communicating ends of the water supply and drainage pipelines and the shear box are respectively positioned on the opposite sides of the two permeable stones. According to the invention, independent loading and stable maintenance of normal pressure, interface shear force and constant seepage pressure difference across the interface direction are realized, and the problems that the functions of the existing test equipment are separated and constant pressure difference seepage and shear load coupling performance test cannot be realized are solved.

The present invention addresses the problem of providing a carbon fiber bundle and a method for manufacturing the same, wherein the interfacial shear strength (IFSS) of the carbon fiber bundle indicating adhesion to resin is high, and the 90° bending strength of a carbon fiber reinforced composite material can be increased without reducing the strand elastic modulus and strand strength. The crystallite size is 2.9 to 3.4 nm and the iPa on the carbon fiber surface is 0.30 μA / cm2 or greater. In a method for manufacturing a carbon fiber bundle including a flame-proofing step for heating a carbon fiber precursor fiber bundle in an oxidative atmosphere and a carbonization step for heating the flame-proof fiber bundle after the flame-proofing step in a non-oxidative atmosphere, a substantially untwisted carbon fiber precursor fiber bundle is used, and the elongation of the fiber bundle in a carbonization temperature region of 1,000°C or greater in the carbonization step is set to −2.7% or greater, and the maximum carbonization temperature is set to 1,800-2,200°C.

This invention discloses an underwater cooling process that enhances the coupling properties of thermoplastic composites, belonging to the field of composite material processing technology. For thermoplastic composite parts that have just been removed from the mold and are in a high-temperature state, a specific cooling solution is used for jet cooling through an optimized nozzle system. The core of this process lies in the synergistic effect of forced convection, phase change cooling, and dynamic heat conduction. This rapidly reduces the overall temperature of the part (suppressing the formation of large-sized spherulites) while mitigating the temperature gradient in the interfacial region, promoting the full diffusion and entanglement of polymer chains to the surface of the reinforcing fibers within the viscous flow window, thereby optimizing interfacial bonding. By balancing crystallinity and residual stress, this process can increase the interfacial shear strength (IFSS) of the composite material by 15-20%.

The invention provides a carbon fiber composite material interface enhanced modulus decreasing interface transition layer construction method and a product, and relates to the technical field of composite material interface enhancement. According to the interface transition layer construction method, an aminated metal organic framework NH2-UIO-66 and a zeolite imidazole framework material ZIF-8 are introduced to serve as middle layers, and finally polyether amine PEA is grafted; a modulus decreasing interface transition layer of a three-layer structure is constructed and used for reinforcing the carbon fiber composite material; wherein from inside to outside, the first layer of the transition layer is NH2-UIO-66, the second layer of the transition layer is ZIF-8, and the third layer of the transition layer is PEA. According to the scheme, the interfacial shear strength between pure carbon fibers and epoxy resin is improved by 95.8%, and the performance of the carbon fiber composite material can be effectively improved.

This invention discloses an ultrathin plywood with thermo-mechanical modification, its manufacturing method, and apparatus. By introducing CNTs / Cu binary micro / nano fillers, the modification effect of carbon nanotubes (CNTs) on the thermoplastic resin matrix is ​​utilized to improve the interlayer shear strength, fracture toughness, and in-layer thermal conductivity of the ultrathin plywood (FMLs). Different contents and sizes of granular Cu powder fillers act as anchors between different plies, forming thermally conductive microchannels, thus improving both the interlayer shear properties and the thickness-based thermal conductivity of the ultrathin plywood (FMLs). Segmented heating and ultrasonic vibration-assisted hot pressing of the FMLs laminations simultaneously achieve synergistic modification of the interlayer interfacial mechanical and thermal properties during the preparation of the ultrathin plywood (FMLs) material. This effectively solves the problem of weak interlayer bonding and poor thickness-based thermal conductivity in ultrathin plywood (FMLs), which restricts its application range and serviceability, and enhances the structural and functional designability of components for specific service environments.

The invention provides an experimental determination method for an annular flow pattern interface shear force, and belongs to the technical field of gas well drainage and mining processes, the method comprises the following steps: carrying out a visual physical simulation experiment, observing an annular flow pattern flow state, taking a base membrane area as a liquid membrane main body bearing part, uniformly distributing ripples with micron-order wave amplitudes on the surface, and taking the ripples with micron-order wave amplitudes as a liquid membrane main body bearing part; a disturbance wave area shows three-dimensional wave structure characteristics, a liquid film structure under different flow parameters is a complex combination of disturbance waves and ripples, the disturbance wave area is divided into a base film area and the disturbance wave area, and for the base film area, a sectional roughness expression is constructed with the critical liquid film thickness as a threshold value; for a disturbance wave area, Weber number, Froude number, pipe diameter and liquid phase Reynolds number expressions are introduced, and an experimental determination method of the annular flow pattern interface shear force is provided through weighted solution. Therefore, the calculation method is high in actuarial performance, and a theoretical basis is provided for optimization design of the drainage and mining process.

The application belongs to the technical field of electromagnetic shielding materials, and particularly relates to a manufacturing method of a conductive foam and ferrite composite shielding structure. The application discloses a conductive foam-ferrite composite shielding structure and a manufacturing method thereof. The structure is formed by pre-compressing a conductive foam base body (compression rate 50-70%), dipping a nickel-zinc ferrite slurry (D50=2-3 microns), step curing (80 DEG C to 120 DEG C), magnetron sputtering a NiCu transition layer (150-250 nm), electroplating a SnBi alloy layer (3-8 microns), and laser cutting to form a 28-32% open porosity grid. The structure realizes a shielding effectiveness of 92 dB at a frequency of 10 GHz (84% higher than that of pure foam), an interfacial shear strength of 15 MPa, a thermal expansion coefficient of 8*10 ‑6 / ℃, resistance to 260 DEG C reflow soldering for 3 times, an oxidation resistance time of >5000 hours, and is suitable for electromagnetic shielding of high-frequency electronic equipment.

The invention relates to a preparation method of polyacrylate for repairing soil layer cracks. A powder curing agent (PCA) is prepared by utilizing a packaging technology and is uniformly dispersed in a polyacrylate base solution, and a novel polyacrylate soil layer crack repairing material (EPCRM) is prepared. The penetration depth of the EPCRM is equivalent to that of emulsified asphalt, and the penetration performance is excellent; when the temperature of the EPCRM is-10 DEG C, the Czochralski bonding strength of the EPCRM is slightly lower than that of an asphaltene repairing material, but the Czochralski bonding strength of the EPCRM is gradually increased along with the increase of the temperature, so that the EPCRM shows good tensile bonding performance; the interfacial shear strength of the EPCRM shows a relatively high level in a whole temperature range, and the shear resistance is excellent. The invention provides a new thought and method for rapid, efficient and environment-friendly maintenance of the soil layer, and promotes development of a soil layer maintenance technology.

This utility model discloses a wear-resistant reinforcing layer structure for rubber products, comprising a rubber base layer, an elastic buffer intermediate layer and a wear-resistant top layer sequentially disposed above the rubber base layer. The Shore hardness of the elastic buffer intermediate layer is lower than that of the wear-resistant top layer but higher than that of the rubber base layer. This utility model achieves initial wear resistance through the wear-resistant layer, while simultaneously providing a sacrificial lubrication layer and hemispherical wear-resistant protrusions on the wear-resistant layer to form a dual-level protection. The sacrificial layer initially consumes wear resistance, while the wear-resistant protrusions provide chip storage space in the later stages, extending the service life of the wear-resistant layer. The elastic buffer intermediate layer ensures that the impact stress received by the wear-resistant layer is buffered and does not directly affect the rubber base layer. Furthermore, the two transition sub-layers, with their varying hardness, reduce interfacial shear stress.

The invention discloses a fatigue-resistant polyester-nylon composite yarn and a preparation process thereof, the polyester-nylon composite yarn comprises a polyester core layer and a nylon sheath layer, the polyester core layer comprises nano silicon dioxide, the nylon sheath layer comprises a thermoplastic polyester elastomer, and the thermoplastic polyester elastomer is a thermoplastic elastomer. A micro-crosslinking transition layer is formed at the interface of the polyester core layer and the chinlon sheath layer, the micro-crosslinking transition layer is formed by reaction of an epoxy silane crosslinking agent and a polyester / chinlon molecular chain, through the synergistic effect of chemical micro-crosslinking and physical reinforcement, the interface shear strength is improved by 30% or above compared with that of a traditional composite yarn, the layering and stripping problems are thoroughly solved, and the tensile strength of the composite yarn is improved by 30% or above. A covalent bond network formed by the micro-crosslinking transition layer can effectively transfer interface stress, so that the interface of the composite filament is always kept complete in the repeated stretching and bending process; the nano silicon dioxide reinforced polyester core layer and the elastomer modified chinlon sheath layer form a rigid-flexible structural system, and the fatigue stress concentration coefficient is reduced.

The invention provides a sizing method for carbon fibers with high interface bonding strength, which belongs to the technical field of carbon fibers and comprises the following steps: activating carbon fibers subjected to high-temperature carbonization; immersing the activated carbon fiber in the sizing liquid, and performing ultrasonic treatment to obtain the impregnated carbon fiber; wherein the sizing liquid is prepared from a sizing agent, and the sizing agent is prepared from diethanol amine modified novolac epoxy resin, a diepoxy terminated catechol-phenylboronic acid ester cross-linking agent, an amino-functionalized multi-walled carbon nanotube, amino-terminated polyether and water; and sequentially carrying out first high-temperature treatment and second high-temperature treatment on the impregnated carbon fiber to obtain the carbon fiber with high interface bonding strength. The sizing method provided by the invention effectively solves the problems of weak interface bonding force, easy debonding, brittle fracture and the like caused by chemical inertness of the surface of the carbon fiber, and obviously improves the interface shear strength, the interface stripping toughness and the overall cycle fatigue life of the carbon fiber composite material.

The invention provides a clamp and a method for testing the shear performance of a bonding interface of aggregate and a cementing material, and relates to the technical field of building material testing. A load transmitter of the clamp can be movably installed on the upper portion of a rigid frame in the vertical direction, a clamping mechanism is installed on the lower portion of the rigid frame, a loading block at the bottom of the load transmitter and the clamping mechanism are arranged in a staggered mode in the vertical direction, and the loading block is used for pressing the suspended end of a test sample. The loading block is hung on the rigid frame through the first adjusting screws and the springs, and the horizontal position of the loading block can be finely adjusted by rotating the two first adjusting screws; a second adjusting screw on the side wall of the rigid frame can adjust the pre-fixing position of the loading block in the vertical direction; according to the clamp and the method, stable clamping of the irregular-shaped aggregate, accurate centering of the shearing interface and uniform transfer of the load can be realized, so that real and reliable interface shearing performance parameters are obtained, and meanwhile, the test efficiency and the operation convenience are greatly improved.

The invention discloses a carbon fiber reinforced polyether-ether-ketone composite material and a preparation method thereof, and relates to the technical field of high polymer materials. When the carbon fiber reinforced polyether-ether-ketone composite material is prepared, firstly, a diamino monomer reacts with 3, 3 ', 4, 4'-benzophenone tetracarboxylic dianhydride to prepare a water-based ultraviolet absorption sizing agent; growing a metal organic framework on the activated carbon fibers in situ to prepare modified carbon fibers; the preparation method comprises the following steps: filling ferroferric oxide into carboxylated carbon nanotubes, and reacting with KH-550 to obtain modified carbon nanotubes; dispersing a water-based ultraviolet absorption sizing agent and modified carbon nanotubes in water, and soaking the modified carbon fibers in the water-based ultraviolet absorption sizing agent to obtain sized carbon fibers; and alternately laying the polyether-ether-ketone powder and the sizing carbon fibers, and carrying out hot press molding to prepare the carbon fiber reinforced polyether-ether-ketone composite material. The carbon fiber reinforced polyether-ether-ketone composite material prepared by the invention has the advantages of high bending strength, high interfacial shear strength, aging resistance and strong electromagnetic shielding performance.

The invention discloses a modified aramid fiber and a preparation method thereof, and the modified aramid fiber is characterized in that a bifunctional molecular layer is grafted on the surface of the aramid fiber through chemical bonds. The molecular layer is provided by an organosilane bifunctional coupling agent with a structural general formula of X-L-Y, X is a group (such as chlorosilane, alkoxy silane and the like) capable of forming a stable first covalent bond with the fiber surface, Y is a group (such as furyl, maleimide and the like) capable of forming a dynamic covalent bond interface with a resin matrix, and L is a connecting chain. The preparation method comprises the following steps: carrying out surface activation treatment on the aramid fiber, and then carrying out grafting reaction on the aramid fiber and a difunctional coupling agent under the action of a catalyst. According to the method, a molecular layer with stable anchoring and dynamic reversible reaction characteristics is introduced to the surface of the fiber, so that the obtained composite material obtains high interfacial shear strength (ILSS), the mode I interlayer fracture toughness (GIC) is remarkably improved, and the technical problem that the interfacial strength and toughness are difficult to synergistically improve in a traditional modification method is effectively solved.

The application discloses a composite material fiber-matrix interface shear strength indirect testing method based on a Brazilian splitting method, which comprises the following steps: step 1, determining the fiber length and the Brazilian disc sample size according to preset conditions, and preparing a single fiber Brazilian sample; step 2, carrying out a compression Brazilian destruction test, obtaining a load-displacement curve and a sample section; step 3, analyzing the sample section, if the section shows a fiber pull-out state, the test data is valid, if the section shows that the fiber is not pulled out, the test data is invalid, jumping to step 1, repeating steps 1-3 until the test data is valid; step 4, obtaining a load value Fmax before a load sudden drop through the load-displacement curve; step 5, establishing a fiber Brazilian test simulation model through a finite element software, inputting the load value Fmax, and obtaining a fiber tensile stress σ f ; and step 6, calculating and obtaining a fiber / matrix interface shear strength.

The application relates to a high-strength quartz sand ceramic material and a preparation method and application thereof. A multi-scale reinforcing network is constructed by gradient matching of quartz fibers and silicon carbide fibers, grain boundary sliding is inhibited, nano-scale micropores are formed on the fiber surfaces through HF acid etching, and the interface shear strength is improved by combining with a silane coupling agent bridge. In addition, the composite powder of Al2O3 and ZrO2 can inhibit abnormal grain growth in a sintering process through stage gradient sintering, that is, first stage degumming, second stage nucleation and third stage densification. Nano-crystalline grains are twisted through high-density dislocations and are pinned through a grain boundary pinning effect, so that the grain boundary sliding resistance is improved by 3 times. Meanwhile, Si-O-Al bonds are formed between excessive Al2O3 and modified fibers, which is beneficial to reducing the interface thermal resistance, improving the heat resistance of the material and avoiding thermal stress concentration.

The invention discloses a sawtooth-shaped interface processing and pouring method for improving shear strength of a rock-concrete interface, and relates to the technical field of crossing of geotechnical engineering and structural engineering. The method comprises the following steps: acquiring a crack propagation path, a failure mode and a strength response rule under an inclination angle, constructing an adaptive asymmetric sawtooth topology geometric model according to the strength response rule and the failure mode, performing precision machining on a rock base surface according to the sawtooth topology geometric model to form a sawtooth-shaped interface groove, and performing numerical simulation on a high-damage risk area identified in numerical simulation to obtain a crack-shaped interface groove. A zigzag interface groove is formed in the rock base surface, a high-strength functional area and a high-toughness functional area are divided in the zigzag interface groove, the high-strength functional area is filled with high-strength concrete, the high-toughness functional area is filled with fiber toughening concrete, a hybrid fiber system composed of steel fibers and synthetic fibers is doped into a key stress part of the zigzag interface groove, and main body concrete is integrally poured on the rock base surface and maintained.

The invention discloses a reinforcing steel bar and concrete interface displacement field testing method and device.The displacement field testing device is mainly composed of a top plate, a bottom plate, a balance plate, a lead screw assembly, a sleeve, an upper loading head, a lower loading head, a testing machine and a DIC testing device.According to the displacement field testing method, a shear test piece is fixed through the displacement field testing device; carrying out a shear experiment; collecting a speckle pattern of the interface through the DIC test device, and processing the speckle pattern to obtain a displacement field; the method comprises the following steps: firstly, dividing a single-side J-integral path in a displacement field, determining a change curve of single-side J-integral along with loading time through a J-integral calculation formula, finally, extracting axial strain of a stage line on the displacement field, and determining a bonding-slip curve by utilizing a relationship between interface shear stress and the axial strain. The method has the advantages of low experiment cost, high experiment success rate, simplicity and convenience in operation and the like.