3193 results about "Fatigue resistance" patented technology

The invention relates to the technical field of bridge structure health monitoring and maintenance, and discloses a bridge structure anti-fatigue performance predictive maintenance method based on digital twinning, and the method comprises the steps: constructing a bridge structure digital twinning model, and deploying a multi-mode sensing network; establishing a bridge fatigue mechanism knowledge graph, and structuring expert experience and historical cases; multi-source heterogeneous evidence fusion is realized based on a DS evidence theory, and evidence conflicts are eliminated; constructing a cause and effect inference engine based on a Bayesian network, and identifying a fatigue mechanism path; and a self-adaptive predictive maintenance decision-making system is realized, and an optimal maintenance strategy is generated. The problems that a traditional bridge fatigue analysis method is difficult to process multi-source heterogeneous data, the fatigue prediction precision is insufficient and the like are solved, and high-precision prediction and precise maintenance of the anti-fatigue performance of the bridge structure are achieved.

The GPa-grade ultrahigh-strength anti-fatigue steel comprises the following chemical components in percentage by weight: 0.02 to 0.07 percent of C, 0.10 to 0.25 percent of Si, 1.75 to 2.50 percent of Mn, 0.022 to 0.026 percent of P, less than or equal to 0.008 percent of S, 0.03 to 0.04 percent of Nb, 0.09 to 0.15 percent of V, 0.045 to 0.055 percent of Ti, 0.50 to 0.80 percent of Mo, 2.00 to 2.40 percent of Cr, 8.0 to 10.0 percent of Ni, 8.0 to 12.0 percent of Co, 0.035 to 0.045 percent of Als, 0.013 to 0.014 percent of N, 0.58 to 0.62 percent of Cu, 0.03 to 0.05 percent of Sb, 0.03 to 0.05 percent of RE and 0.0008 to 0.001 percent of B. The method comprises the steps of smelting, continuous casting, rapid cooling, casting blank heating, rolling and heat treatment. The maximum thickness of the steel plate is 100mm, Rp0.2 is 1080-1120MPa, A is greater than or equal to 18%, and the fatigue life gt under the peak stress of 560MPa; the impact energy at-60 DEG C is greater than or equal to 150J, and the marine atmosphere corrosion resisting rate is 1t; and 0.10 mm / a. The strength of the steel is improved, the impact toughness of the steel plate at low temperature is improved, and the corrosion resistance and the fatigue resistance of the steel are improved.

The invention provides a hot in-place recycling asphalt mixture and a construction method, and relates to the technical field of asphalt mixtures, and the hot in-place recycling asphalt mixture is obtained by recycling old asphalt pavement materials in a high proportion, reducing new material consumption and carbon emission, realizing resource recycling and green construction and introducing a regenerant to recover the performance of aged asphalt. The high-temperature rut resistance, the low-temperature crack resistance, the fatigue resistance and the interface bonding strength of the mixture are synergistically improved by matching with the styrene butadiene rubber modifier, the basalt fiber, the nano silicon dioxide and other functional materials, and the mixture is ensured to be uniform and free of segregation through precise feeding sequence, high-pressure atomization spraying and forced stirring parameter control. The defects of gray materials, oil balls and the like are avoided, the compactness, the flatness and the overall structure stability of the regenerated pavement are improved, and the problems of performance degradation and insufficient durability of a traditional regenerated mixture are solved.

The invention provides a glass fiber reinforced nylon composite material and a preparation method thereof, and belongs to the technical field of high polymer materials, the glass fiber reinforced nylon composite material comprises the following components by weight: 75-82 parts of nylon 6, 14-16 parts of modified glass fiber, 2-3 parts of polyethylene glycol, 0.4-0.7 part of an antioxidant, 0.6-1 part of a lubricant and 0.6-1 part of an antistatic agent; the modified glass fibers are prepared by treating glass fibers with a silane coupling agent and then treating the glass fibers with a dopamine-boron nitride surface modifier. The excellent tensile strength of the prepared composite material is guaranteed, and meanwhile, the reduction of the elongation at break is effectively avoided, so that the fatigue resistance of the composite material is guaranteed, and the service life is further prolonged.

The invention relates to the field of composite materials, and discloses an unmanned aerial vehicle carbon fiber shell preparation method, which comprises: carbon fiber surface modification treatment: carrying out surface cleaning, activation, chemical plating and surface functional modification on carbon fibers; preparing a resin matrix: mixing epoxy resin with a flexible toughening agent, a nano filler and a curing agent, and carrying out vacuum defoaming; carbon fiber laying: laying the modified carbon fiber cloth according to a set angle and sequence; vacuum bag forming: performing vacuum sealing on the laid carbon fiber composite material; and hot-pressing and curing: curing the composite material in an autoclave under the process conditions of set temperature, pressure and time. Through collaborative design of interface modification, matrix enhancement and process optimization, the comprehensive performance of the composite material is improved, so that the requirements of the unmanned aerial vehicle shell for high strength, fatigue resistance and impact resistance are met.

The invention discloses steel for extremely cold marine environment engineering and a production method of the steel. The steel comprises the following chemical components: 0.02 to 0.07 percent of C, 0.10 to 0.25 percent of Si, 1.75 to 2.50 percent of Mn, 0.022 to 0.026 percent of P, less than or equal to 0.008 percent of S, 0.025 to 0.030 percent of Nb, 0.02 to 0.03 percent of V, 0.02 to 0.03 percent of Ti, 0.15 to 0.35 percent of Cr, 0.15 to 0.35 percent of Ni, 0.02 to 0.05 percent of Co, 0.035 to 0.045 percent of Als, 0.010 to 0.012 percent of N, 0.15 to 0.22 percent of Cu, 0.03 to 0.05 percent of Sn, 0.03 to 0.05 percent of Sb and 0.03 to 0.05 percent of RE. Through smelting, slab continuous casting, casting blank heating, rolling and cooling, the Rp0.2 of the steel is 420-480 MPa, A is larger than or equal to 26%, the impact energy at the temperature of-80 DEG C is larger than or equal to 210 J, the corrosion resistance rate is smaller than 0.080 mm / a, the fatigue life under the peak stress load of 200 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 45%. The steel plate provided by the invention has relatively high strength and excellent low-temperature toughness, and also has relatively good corrosion resistance and fatigue resistance.

The utility model relates to an automobile sealing strip fatigue resistance test device, the test device is used for carrying out fatigue resistance test on a sealing strip on an automobile window assembly, and the automobile sealing strip fatigue resistance test device comprises a test bench; the fixing mechanism is arranged on the test board and is used for fixing the vehicle window assembly; the pressing and releasing mechanism comprises a driving assembly and a profiling part connected with the driving assembly, the driving assembly can drive the profiling part to repeatedly press the sealing strip, and the profiling part is provided with a profiling face matched with the surface of the sealing strip. According to the fatigue resistance test device for the automobile sealing strip, through cooperative arrangement of the test bench, the fixing mechanism and the pressing and releasing mechanism, the fatigue resistance test can be performed on the sealing strip on the automobile window assembly in a low-cost and high-efficiency manner, and the fatigue resistance test device has relatively good universality and compatibility.

The invention provides a robot joint dynamic cable made of a self-repairing polyurethane material and a preparation method of the robot joint dynamic cable, and belongs to the field of cables. Polytetrahydrofuran glycol and hexamethylene diisocyanate react to form a soft and hard segment structure, 1, 4-butanediol is added for chain extension, dopamine hydrochloride is introduced, the hard segment structure is enhanced, and a self-repairing hydrogen bond network is formed; carbon nanotubes are introduced, and through plasma treatment and silane coupling agent modification, the tensile resistance, fatigue resistance and electrical properties of the material are improved; montmorillonite is compounded with polyethyleneimine through organic treatment, so that the cracking resistance and wear resistance of the material are enhanced; epoxy groups are introduced to the surface of boron nitride, and dopamine hydrochloride is self-polymerized, so that excellent heat dissipation capability and dimensional stability are provided. Through the synergistic effect of the components, the composite material has excellent mechanical properties, electrical properties, heat dissipation, wear resistance and the like, is especially suitable for a dynamic cable of a robot, and can stably work in a complex environment for a long time.

The invention discloses a method for improving the high-cycle fatigue performance of a Ti6Al4V titanium alloy, and belongs to the technical field of metal material processing, and the method comprises the following steps: S1, determining shot peening strengthening parameters based on material performance parameters and related standards; according to the method, high-amplitude residual compressive stress is introduced through shot peening strengthening, the stress state of the surface and the depth direction of the material is changed, accordingly, crack extension can be restrained, the fatigue life is prolonged, in addition, a plastic deformation layer is induced to be generated under the surface depth in the shot peening process, the microstructure of the material is improved, and the anti-fatigue performance of the material is improved; through femtosecond laser shock, surface defects can be effectively removed, the surface compactness can be improved, microcracks can be reduced, and a refined grain structure can be generated, so that the strength and toughness of the material are further enhanced, the high-cycle fatigue performance of the material is further improved, the two are combined, the residual stress state is optimized, and the surface integrity is improved. The fatigue performance of the Ti6Al4V titanium alloy is remarkably improved.

The invention discloses ultralow-temperature high manganese steel and a manufacturing method of an ultralow-temperature high manganese steel plate. The ultralow-temperature high manganese steel comprises the following components in percentage by weight: 0.35-0.55% of C, 0.01-0.10% of Si, 20.00-30.00% of Mn, 0.01-0.10% of Al, less than or equal to 0.005% of P, less than or equal to 0.003% of S, 3.0-5.0% of Cr, 0.3-1.0% of Cu, 0.2-1.20% of Ni, less than or equal to 0.008% of N, less than or equal to 0.002% of O, less than or equal to 0.0002% of H and the balance of Fe and inevitable impurity elements. The manufacturing method of the ultralow-temperature high manganese steel plate comprises the steps of molten iron pretreatment, K-OBM-S converter smelting, LF refining, continuous casting, annealing and coping, hot rolling, online solution treatment and the like. According to the method, high steel purity, low phosphorus and sulfur content, small segregation of the casting blank and the steel plate, good macrostructure of the casting blank and no crack on the surface and in the casting blank can be guaranteed, and the finished steel plate has the characteristics of low yield ratio, high tensile strength, high ultralow-temperature toughness, small thermal expansion coefficient, good fatigue resistance and the like; through the implementation of the invention, the manufacturing cost of the steel for the liquefied natural gas storage tank can be reduced to 1 / 3 of that of 9% Ni steel in the prior art.

The invention relates to the technical field of structural dynamic stress measurement, and discloses a method and system for designing a dynamic stress measurement patch of a lobe-containing whole-ring thin-wall stator structure. According to structural geometric characteristics, modal characteristics, excitation sources, crack positions and the like of the lobe-containing whole-ring thin-wall stator structure, the dynamic stress of the lobe-containing whole-ring thin-wall stator structure is measured; the equivalent vibration stress of all surface nodes of the lobe-containing whole-ring thin-wall stator structure is fully considered, the node with the maximum equivalent vibration stress is determined as the patch point of the strain gauge, the pasting position of the strain gauge can be rapidly determined, the influence rule of the wake region and the non-wake region of the support plate on the dynamic stress of the stator structure can be obtained, the test efficiency is improved, and the test cost is reduced. And the dynamic stress characteristics of the lobe-containing whole-ring thin-wall stator structure can be obtained by utilizing the designed strain gauge, and data support is provided for the high-cycle fatigue resistance design of the lobe-containing whole-ring thin-wall stator structure.

The invention discloses a high-conductivity palladium alloy for a chip test probe and a preparation method of the high-conductivity palladium alloy, and the palladium alloy comprises the following components in percentage by mass: 50-58% of Pd, 35-40% of Cu, 5-10% of Ag, 0.05-1.0% of Cr and 0.1-1.5% of auxiliary elements, the auxiliary element is selected from at least one of Al, Zn, In and Si; the resistivity of the palladium alloy is 8.0 mu omega.cm or below, the Vickers hardness is 450 HV or above, the 90-degree bending frequency is 8 or above, the tensile strength is 1500 MPa or above, and the ductility is 6% or above, the palladium alloy is subjected to pre-smelting and secondary smelting, and at least part of Cu and at least part of Cr in raw materials are mixed and pre-smelted to obtain a copper-chromium intermediate alloy; and the copper-chromium intermediate alloy and the remaining raw materials are mixed and then subjected to secondary smelting. The palladium alloy can meet the urgent requirements of probes in various forms on low resistance, high plasticity and toughness, fatigue resistance, mechanical strength and the like at the same time.

The all-metal vibration isolation buffering device comprises a bearing base, a center disc is arranged in the center of the bearing base, a buffering pad is arranged between the center disc and the bearing base in a clamped mode, and a plurality of vibration isolation structures are evenly distributed on the periphery of the center disc in a circumferential mode; and the vibration isolation structure is telescopically connected with the central disc. Due to the excellent high and low temperature resistance, fatigue resistance and omni-directional vibration isolation and buffering performance, an efficient and stable vibration isolation and buffering effect can be provided in an extreme environment. The all-metal multidirectional vibration isolation buffer structure can replace a traditional rubber vibration isolator, is applied to the fields of spaceborne, aerospace, precise instruments, ship equipment, high-speed traffic and the like, and is used for reducing the influence of vibration on key equipment, improving the stability of a system, prolonging the service life of the system and meeting the application requirements of high reliability and long service life.

The invention belongs to the technical field of photovoltaic supports, and particularly relates to a photovoltaic flexible support which comprises two edge supporting pieces, at least two assembly fixing cables, an assembly bearing cable, at least two wind-resistant frames and a ground anchor mechanism, and under the action of the wind-resistant frames, the assembly fixing cables and the assembly bearing cable can form a stable cable net structure. When a wind load acts on the cable net structure, force is transmitted to the wind-resistant frame through the assembly fixing cable, and then the wind-resistant frame distributes and transmits the force to the assembly bearing cable and the ground anchor mechanism, so that the wind resistance of the photovoltaic flexible support can be improved; therefore, the wind load is effectively dispersed and directly guided into the ground, the large-amplitude flutter and distortion of the cable net structure under the wind pressure are further inhibited, and the dynamic stability and the anti-fatigue performance of the whole photovoltaic flexible support are improved.

The invention relates to the technical field of magnesium-aluminum alloy heat treatment, and discloses a high-strength and high-conductivity magnesium-aluminum alloy heat treatment method which comprises the following steps: step 1, surface cleaning treatment: carrying out surface cleaning treatment on a magnesium-aluminum alloy workpiece to remove oil stains, impurities and an oxide layer on the surface; secondly, preheating treatment is conducted, specifically, the cleaned magnesium-aluminum alloy workpiece is put into a heating furnace, the temperature is slowly increased to 200 DEG C at the temperature increasing speed of 10 DEG C / min, and heat preservation is conducted for 1-2 hours at the temperature; thirdly, the temperature is rapidly increased to the solid solution temperature, and after preheating treatment is completed. Precipitated phase distribution is optimized through two-stage aging treatment, a precipitated phase is preliminarily formed through low-temperature short-time aging, then the precipitated phase is uniformly grown through high-temperature long-time aging, local aggregation is avoided, meanwhile, solution treatment and quenching cooling are optimized, uniform dissolution of solute atoms is ensured, the alloy strength and hardness are improved, and the service life of the alloy is prolonged. And the fatigue resistance and the crack propagation resistance are remarkably improved through uniform precipitated phase distribution.

The invention provides an aluminum alloy material, a preparation method thereof and a cable. The aluminum alloy material is prepared from the following components in percentage by mass: 0.03 percent to 0.06 percent of Si, 0.80 percent to 1.2 percent of Fe, 0.15 percent to 0.25 percent of Cu, 0.005 percent to 0.03 percent of B, 0.001 percent to 0.02 percent of Ti, 0.05 percent to 0.15 percent of Y, 0.08 percent to 0.2 percent of the total mass of La and Ce and the balance of Al. The specific content of Fe is added into the aluminum alloy material and cooperates with the rare earth elements Y, La and Ce, and the elongation at break of the aluminum alloy material is improved; meanwhile, due to the addition amount of the Y element, the fatigue resistance of the material is further improved, the toughness of the material is improved, and the heat resistance and cold resistance of the material can be improved. A specific content of boron element is added to form nuclear particles, so that the effect of refining grains is achieved, and the tensile strength of the aluminum alloy material is improved; and meanwhile, the resistivity of the aluminum alloy material is further reduced through cooperation of the boron element and other components. And the titanium element can also play a role in refining grains, so that the tensile strength of the material is further improved. The cable prepared from the aluminum alloy material can meet the requirement of a cable torsion experiment.

The invention provides a variable-stiffness anti-fatigue flexible cable, and relates to the technical field of cables, and the flexible cable comprises a heat conduction channel which is arranged along the axial direction of the cable in a penetrating manner, a conductor which is spirally arranged around the heat conduction channel, a filling layer which wraps the heat conduction channel and the conductor, a shielding layer of which the inner side is provided with a storage cavity, and an adjusting layer which comprises a plurality of rigid adjusting units. Wherein heat conduction liquid is arranged in the heat conduction channel, a heat conduction pipe is embedded in the filling layer, the heat conduction pipe is provided with a valve port, the heat conduction pipe is communicated with the storage cavity, and each rigid adjusting unit is a flexible bag filled with a phase change material. Liquid heat triggers the phase-change material to expand through the shielding layer, so that the rigidity adjusting unit extends to enhance local rigidity, the effect of inhibiting excessive bending is achieved, the short-time hardness of a bending part is higher than that of a peripheral area due to expansion retention of the phase-change material, and the purpose of dynamically transferring a bending stress point is achieved.

The invention discloses a high-performance polyether-ether-ketone plate and a preparation method thereof, and belongs to the technical field of semiconductor manufacturing. The high-performance polyether-ether-ketone plate comprises the following components in parts by weight: 80-90 parts of polyether-ether-ketone, 1-3 parts of carbon nanotubes, 1-3 parts of graphene nanosheets, 2-5 parts of conductive tin oxide micro powder, 3-5 parts of polytetrafluoroethylene micro powder and 0.5-1 part of a silane coupling agent. The PEEK composite material provided by the invention has excellent mechanical, conductive, heat management, corrosion resistance and antistatic properties, and is suitable for severe environments such as high temperature, corrosion and fatigue resistance.

The invention relates to an epoxy-terminated polyurethane flexibilizer for bridge and tunnel pavement, and a preparation method and a use method thereof, and the flexibilizer is prepared by terminating a polyurethane prepolymer through an epoxy group of an epoxy compound under the catalytic action of nano-modified imidazole; wherein an epoxy group reacts with an NCO group at the end part of a polyurethane prepolymer, and a five-membered ring structure with high cohesive energy is introduced into a polyurethane molecular chain. A main chain of the epoxy-terminated toughening agent contains a five-membered ring structure, and the epoxy-terminated toughening agent is prepared from an epoxy group and an isocyanate group through catalysis of nano-modified imidazole at a relatively low temperature. Due to the fact that the cohesive energy of the five-membered ring is high, the steric hindrance effect is large, good high and low temperature stability is achieved, and the damping temperature range is wide. And after being cured, the curing agent has the properties of high-temperature rutting resistance, medium-temperature fatigue resistance, low-temperature crack resistance and the like, and the problem of insufficient toughness of an epoxy mixture in conventional pavement is solved.

The invention relates to the technical field of photovoltaic equipment, and discloses a cable-supported marine photovoltaic floating system, which comprises floating units, a cable net structure, a frame structure and a mooring structure, the cable net structure comprises longitudinal cables and transverse cables, the longitudinal cables and the transverse cables intersect to form a grid shape, and the longitudinal cables and the transverse cables intersect and are fixed in the floating units; the outer ends of the longitudinal cables and the outer ends of the transverse cables are connected with the frame structure, the frame structure is connected with the mooring structure, and the mooring structure is used for keeping pretension of the transverse cables and the longitudinal cables. According to the scheme, the longitudinal cables and the transverse cables are stressed in a face mode, a traditional point stress mode is replaced, external force can be dispersed more evenly, the local damage risk is reduced, and high fatigue resistance is achieved; the longitudinal cables and the transverse cables are fixed through the floating units, relative displacement of the longitudinal cables and the transverse cables is avoided, the integrity of the cable net structure is guaranteed, the frame structure and the mooring structure fluctuate up and down along with stormy waves and adapt to dynamic changes of the cable net structure, and the stability and durability of the whole floating type offshore photovoltaic system in the complex marine environment are guaranteed.

The invention discloses high-performance corrosion-resistant maritime work steel and a production method thereof, and the steel comprises the following chemical components: 0.02%-0.07% of C, 0.10%-0.25% of Si, 1.75%-2.50% of Mn, 0.022%-0.026% of P, less than or equal to 0.008% of S, 0.055%-0.060% of Nb, 0.035%-0.045% of Als, 0.90%-1.00% of Cr, 0.90%-1.00% of Ni, 0.20%-0.25% of Co, 0.0130%-0.0114% of N, 0.06%-0.065% of V, 0.035%-0.042% of Ti, 0.45%-0.52% of Cu, 0.03%-0.05% of Sn and 0.03%-0.05% of RE. Through smelting, slab continuous casting, casting blank heating, rolling and cooling, the Rp0.2 of the steel is 550-582 MPa, A is larger than or equal to 20%, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, the corrosion resistance rate is smaller than 0.090 mm / a, the fatigue life under the load of the peak stress of 280 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 40%. The problems that an existing steel plate for ocean engineering is low in strength, poor in low-temperature impact toughness and insufficient in corrosion resistance and fatigue resistance are solved.

The invention provides multi-element alloy silver-free copper-based brazing filler metal and a preparation method thereof.The brazing filler metal comprises, by mass, 30%-40% of zinc, 4%-11% of manganese, 1%-4% of tin, 0.2%-0.6% of silicon, 0.2%-1% of rare earth elements and the balance copper, the rare earth elements comprise cerium, praseodymium and rhenium, and the mass ratio of cerium to praseodymium to rhenium is (0.8-1.2): (0.8-1.2): (0.6-1.0). According to the multi-element alloy silver-free copper-based brazing filler metal, the performance of a brazed joint is improved, the strength, toughness, fatigue resistance and the like of the joint are improved, and the reliability and stability of connection under various working conditions are ensured.

The invention belongs to the technical field of sealing materials and synthetic rubber, and particularly discloses a high and low temperature resistant, wear resistant and fatigue resistant ethylene propylene rubber material and a preparation method thereof. According to the invention, the ethylene propylene rubber with low ethylene content and high Mooney viscosity is used as a base material, and the flexing resistance of a rubber system is improved by adding the small-particle-size high-wear-resistance carbon black, the high-structure-degree fast extruding carbon black, the compounded semi-reinforcing carbon black and the white carbon black as reinforcing filling materials. The low temperature resistance of the rubber is improved by adding a composite plasticizer (paraffin oil is compounded with a small amount of fatty acid ester plasticizer). Meanwhile, peroxide is selected, and a small amount of sulfur is used as a vulcanization system, so that the flexing resistance can be considered while the high-temperature resistance is ensured. And finally, the anti-aging agent is supplemented to enhance the protection effect on aging caused by heat and oxygen, so that the heat resistance and fatigue resistance of the rubber material are integrally improved. The rubber material provided by the invention can be prepared by adopting a universal mixing process in the rubber industry, and is simple in process and convenient to operate.

The present invention relates to a fatigue-resistant and corrosion-resistant 500 MPa-grade steel plate for marine wind power, the chemical composition of which is as follows, by mass percentage: C: 0.10%-0.12%, Si: 0.20%-0.30%, Mn: 1.20%-1.40%, P≤0.010%, S≤0.005%, Nb: 0.030%-0.040%, Ti: 0.018%-0.030%, Ni: 0.28%-0.38%, Cu: 0.35%-0.55%, Al: 0.020%-0.050%, Pcm being controlled to be ≤0.25%, and the remainder being Fe and unavoidable impurity elements. The 500 MPa-grade steel plate for marine wind power of the present invention is produced using a TMCP+tempering process, and has a thickness of 30 mm-60 mm, a yield strength of ≥500 MPa, a tensile strength of 600-760 MPa, an elongation after fracture of ≥17%, and a core impact energy of ≥120 J at -30℃. Corrosion resistance is improved by 50% or more compared with conventional 355 MPa-grade steel plate for marine wind power. After the steel plate is welded by submerged arc welding with a heat input of ≥35 kJ / cm, the tensile strength of the welded joint is ≥600 MPa, and the impact energy at -30℃ is ≥80 J; under conditions of a stress ratio of 0.5, the fatigue limit of a welded joint after 107 cycles of axial loading is ≥450 MPa. The steel has the characteristics of high strength, fatigue resistance, corrosion resistance and easy welding, and can meet the development requirements of safe service, high strength and light weight for marine wind power facilities.

The invention relates to the technical field of batteries, and particularly discloses a current collector, a method for preparing the current collector, a pole piece, a lithium ion battery and a power utilization device.The current collector comprises a base material and a conductive coating arranged on at least one side of the base material, and physical crosslinking points are evenly distributed in the conductive coating; the physical cross-linking points are non-covalent bond connecting points and comprise coordinate bonds between the binder and metal ions and / or hydrogen bonds between the binder and the polyhydroxy compound. The physical cross-linking points can effectively improve the adaptability of the conductive coating to the expansion and shrinkage stress of the active material layer in the long-term circulation process, the physical cross-linking points can be self-generated again after being damaged, the cross-linking structure improves the adhesion strength of the conductive coating to the current collector, meanwhile, the conductive coating has excellent fatigue resistance, and the service life of the conductive coating is prolonged. After long-term circulation, the high cohesiveness is still kept, and the phenomena of interface separation and active substance powder falling are not prone to occurring.

The invention relates to the technical field of rubber material performance detection, in particular to a dynamic test platform and method for evaluating the bonding effect and fatigue life of rubber and a rubber cord fabric. The dynamic test platform comprises a driving mechanism, a test platform, a clamping mechanism, a monitoring system, a data acquisition module, a control system and a data analysis module. The driving mechanism can adjust the frequency, the displacement amplitude and the acceleration of loading deformation; the test platform supports normal loading pressure to realize simulation of different load working conditions; the clamping mechanism is a two-way adjustable clamp, and free displacement is achieved through a sliding rail mechanism; the monitoring system integrates a force sensor, a displacement sensor and a temperature sensor. The data acquisition module records loading process data; the control system sets parameters through a touch interface and monitors the test in real time; and the data analysis module generates an adhesion performance, fatigue life and damage form evaluation report based on an algorithm. The device can accurately reproduce the adhesive property change under the dynamic working condition, comprehensively analyzes the adhesive strength and fatigue life, provides a scientific basis for research and development and quality control of rubber products, and is suitable for testing the adhesive property of composite materials such as tires and transmission belts.

The invention discloses high-performance anti-fatigue steel for ocean engineering and a production method of the high-performance anti-fatigue steel. The steel comprises the following chemical components: 0.02%-0.07% of C, 0.10%-0.25% of Si, 1.75%-2.50% of Mn, 0.022%-0.026% of P, less than or equal to 0.008% of S, 0.065%-0.070% of Nb, 0.070%-0.075% of V, 0.035%-0.042% of Ti, 1.25%-1.45% of Cr, 1.25%-1.45% of Ni, 0.30%-0.35% of Co, 0.035%-0.045% of Als, 0.0150%-0.0260% of N, 0.45%-0.50% of Cu, 0.03%-0.05% of Sb and 0.03%-0.05% of RE. Through smelting, slab continuous casting, casting blank heating, rolling, cooling and heat treatment, the Rp0.2 of the steel is 690-750 MPa, A is larger than or equal to 20%, the impact energy at the temperature of-80 DEG C is larger than or equal to 200 J, the corrosion resistance rate is smaller than 0.090 mm / a, the fatigue life under the peak stress load of 350 MPa is longer than 2 million times, the maximum thickness can reach 150 mm, and the Z-direction performance is larger than or equal to 40%. The problems that an existing steel plate for ocean engineering is low in strength, poor in low-temperature impact toughness and insufficient in corrosion resistance and fatigue resistance are solved.

The invention relates to the technical field of anti-fatigue of steel parts, and discloses an anti-fatigue system and method for a high-hardness steel part based on ultrasonic-shot blasting composite strengthening. The method comprises the steps that the macroscopic geometrical morphology, the microstructure and the dynamic stress-strain data of a target steel part are collected through a multi-mode sensing system, and a multi-physics field digital twinborn model is constructed through fusion; on the basis of fatigue damage feature distribution in the model, sorting by using an enhanced decision tree model, and triggering parameter configuration by using a priority over-critical value; synchronously calculating ultrasonic field regulation and control parameters and shot blasting trajectory planning parameters through an adaptive neural network algorithm; the parameters are injected into a digital twin model to simulate material response and energy transfer, data such as a microdefect closed state are output, and a parameter correction signal is generated through multi-dimensional consistency inspection. According to the method, precise control over composite strengthening is achieved, and the anti-fatigue performance of the high-hardness steel part is effectively improved.

The invention relates to the technical field of metal powder processing, and discloses a high-performance dissimilar metal powder precision forming process which comprises the following steps: filling powder into a mold cavity, applying vibration disturbance, monitoring the change rate of a phase lag angle, judging that the powder is dense when the change rate is lower than an offset threshold value, outputting a pressing mode switching signal, an induction heating device is used for applying transient thermal load to induce cracks of an oxide film on the surfaces of particles, the pressure load is applied, the side wall is adjusted to generate shear displacement to peel off the oxide film, and metallurgical bonding is achieved through fresh metal surface contact. An interface is activated through thermal expansion mismatch and mechanical friction synergistically, a high-density uniform green body is obtained at low temperature, generation of brittle intermetallic compounds is inhibited, and the fatigue resistance of a formed part is enhanced.

The invention relates to an asphalt mixture, in particular to a modified heavy-load asphalt mixture based on a basalt fiber composite material as well as a preparation method and application of the modified heavy-load asphalt mixture. The modified heavy-load asphalt mixture based on the basalt fiber composite material is prepared from the following raw materials in parts by weight: 10 to 15 parts of asphalt, 1 to 3 parts of modified basalt fiber, 1 to 3 parts of aminated chitin whisker, 85 to 90 parts of mineral aggregate, 5 to 8 parts of hollow glass microspheres, 3 to 6 parts of compatilizer and 1 to 3 parts of stabilizer. Wherein the modified basalt fiber improves the low-temperature crack resistance, high-temperature rutting resistance and water stability of the asphalt mixture, and the aminated chitin whisker improves the fatigue resistance of the asphalt mixture.