300 results about "Fatigue cracking" patented technology

The invention relates to the technical field of machine vision structure health monitoring, and discloses a steel structure weld fatigue cracking real-time monitoring system based on machine vision. The system comprises a space-time registration and fusion module, a multi-scale feature analysis module, a health monitoring module, a crack deduction calculation module and a regulation and control strategy generation module. Performing space-time registration and pixel-level fusion through the visual data of the plurality of image sensors to generate a synchronous multi-source image stream; a multi-level welding seam characteristic spectrum is constructed through multi-scale characteristic analysis, and a welding seam structure knowledge base is dynamically updated; the knowledge base and the real-time characteristic spectrum are used for monitoring the welding seam health state, and abnormity is recognized; deducing a crack initiation position and an evolution path in combination with historical damage data; and real-time load information is fused to pre-estimate the remaining service life, and a structural integrity regulation and control strategy is generated online. According to the invention, high-precision fusion of the multi-source visual data and active prediction of the crack trend are realized, and the monitoring accuracy and the early warning capability are improved.

The invention discloses an elevator steel wire rope wear real-time monitoring system and equipment thereof, and relates to the technical field of safety monitoring, the elevator steel wire rope wear real-time monitoring system comprises an acquisition and extraction module which acquires real-time surface image data and vibration signal data of a steel wire rope through a sensor array, extracts surface damage features and vibration spectrum features by adopting an image processing algorithm, and sends the surface damage features and the vibration spectrum features to a server; fusing kernel function selection and hyperplane separation to process the preliminary wear feature set; the crack identification module is used for fusing tensile strength and corrosion resistance data in the material characteristic database according to the initial wear characteristic set, classifying potential fatigue crack types through support vector identification and crack morphological characteristics by adopting a support vector machine algorithm, and determining a fatigue crack distribution diagram; according to the elevator steel wire rope abrasion real-time monitoring system and equipment thereof, accurate abrasion evaluation and dynamic maintenance optimization are achieved, the safety of the steel wire rope is improved, and the service life of the steel wire rope is prolonged.

The invention relates to a steel structure fatigue crack detection system based on digital twinning, and the system comprises a sensing module which is used for collecting fatigue crack monitoring data of a steel structure in real time; the digital twinning back-end data fusion and management module is used for analyzing and standardizing the fatigue crack monitoring data and constructing a digital twinning model of the steel structure so as to map the entity state of the steel structure and the spatial distribution condition of the fatigue crack; the analysis module is used for detecting the fatigue crack of the steel structure according to the fatigue crack monitoring data, updating a detection result to the digital twinborn model for state synchronization, and performing crack risk early warning; and the visualization module is used for displaying the fatigue crack monitoring data and the detection and early warning result output by the analysis module. Compared with the prior art, real-time detection, trend prediction and multi-level early warning of the fatigue crack of the steel structure are realized through cooperative operation of sensing, fusion, analysis and visualization, and the safety and decision scientificity of the operation and maintenance stage are remarkably improved.

The invention relates to the technical field of image segmentation, provides an image segmentation method and system for a cantilever system of a high-speed rail overhead line system supporting device, and solves the problems that defects in a metal part cannot be detected, and the defect recognition precision is low under high-frequency vibration noise interference. The method comprises the following steps: scanning a metal part of the cantilever system to generate a three-dimensional image, and collecting a stress wave signal of the surface of the metal part under the action of a dynamic load; based on the cyclic load parameter of the metal part, extracting the spectrum characteristic of the stress wave signal, and determining the energy distribution characteristic of the bolt joint by combining the geometric structure parameter of the bolt joint of the metal part; and fusing the three-dimensional image, the energy distribution characteristics, the temperature rise abnormal region and the electric field intensity distribution to generate a multi-source data set, and generating respective segmentation results of the fatigue crack and the insulation aging defect of the metal part in combination with the cyclic load parameters. According to the invention, high-precision collaborative segmentation of metal fatigue cracks and insulation aging defects of the cantilever system is realized.

The invention relates to a large-span bridge steel box girder fatigue damage local and overall collaborative evaluation method and system. Acquiring strain responses of a reference section and a test section of the steel box girder before and during traffic service based on a dynamic load test, defining and calculating a strain ratio and a rigidity ratio of each monitoring point, and diagnosing local crack positions of the steel box girder by utilizing statistical characteristics of the strain ratios; establishing a mapping relation between the rigidity ratio and local damage such as crack length, expansion rate and tip position, and proposing a fatigue crack safety coefficient to realize collaborative quantitative characterization of local damage and overall safety; and constructing a genetic algorithm to optimize a support vector machine model, and developing a real-time evaluation system which takes the real bridge strain response as input and takes the local crack damage type and the overall safety level of the steel box girder as output. The defect that local damage diagnosis and overall performance evaluation of the steel box girder are mutually separated in a traditional method is overcome, and real-time diagnosis and safety evaluation of fatigue damage of the large-span bridge can be synchronously achieved.

This utility model relates to the field of rail transit technology, and in particular to a spring plate for an obstacle detection device, comprising a horizontal plate, wherein one end of the horizontal plate is bent downward to form a bogie support connection part, and the other end is bent downward to form a crossbeam toothed plate connection part, and the bending areas at both ends of the horizontal plate are arc-shaped; the thickness of the crossbeam toothed plate connection part is less than the thickness of the horizontal plate, and the thickness of the arc-shaped bending area between the two gradually decreases along a first preset direction. While satisfying the original performance, this utility model adopts a gradually changing wall thickness structural design, which enhances the stability of the spring plate under high-frequency, high-amplitude random vibration environments, reduces stress concentration in the bolt hole area, and delays the generation and propagation of fatigue cracks, thereby solving the problem of early fracture of spring plates due to stress accumulation in the prior art.

The application discloses a high-performance motor rotor core, comprising rotor laminations, wherein a plurality of magnetic steel slot groups are arranged on the rotor laminations in a circumferential direction; the application has simple structure and reasonable design; stress reduction structures with central symmetry characteristics are arranged to effectively guide and release main radial stress in the magnetic bridge area, optimize stress distribution, avoid fatigue cracks caused by local stress concentration, improve fatigue life and structural safety margin of the magnetic bridge, and improve NVH performance, reduce electromagnetic harmonics, and improve stability and quietness of motor operation; in addition, the overall magnetic steel slot layout is optimized to realize reasonable reduction of material use and lightweight design of the rotor core, and improve power density and dynamic response capability under the premise of guaranteeing electromagnetic performance.

The utility model discloses a kind of CNG pipe bundle type container shockproof fixed connection structure, it is related to pipe bundle type container technical field, including pipe bundle type container body, the lower surface inside the pipe bundle type container body is fixedly connected with two first fixed seat, the top of two the first fixed seat is evenly provided with second fixed seat, the top of two the second fixed seat is fixedly connected with third fixed seat, the upper surface of two the first fixed seat, the upper and lower two surfaces of two the second fixed seat and the lower surface of two third fixed seat are all set with sliding slot, the inside of each sliding slot is slidably provided with arc clamping block. The utility model passes through the sliding of piston plate in sealing cavity, utilizes the viscous damping force generated by the flow of hydraulic oil through fine hole, cooperates with the elastic reset of spring, can effectively absorb the impact force such as jolt, sudden braking in vehicle driving, to significantly reduce the fatigue crack and sealing element failure risk of CNG gas collecting bottle.

This invention discloses a method and system for real-time stress monitoring during laser additive repair of fatigue long cracks in turbine casings. The method includes: preparing a high-temperature resistant speckle pattern in the pre-treated repair area; simultaneously acquiring a sequence of speckle images and a sequence of temperature field images during the laser repair process; calculating the strain field based on digital image correlation and calculating the real-time stress evolution using thermo-elastic-plastic stress-strain increment theory. The real-time stress value is compared with a dynamic threshold set based on the material's yield strength, and the laser power or scanning speed is controlled based on the feedback of the result to achieve closed-loop control of the repair stress. This invention achieves high-precision real-time online monitoring of stress under extreme repair environments, providing a basis for optimizing and intelligently controlling repair process parameters, effectively suppressing residual stress and the risk of secondary cracks, and significantly improving the repair quality and reliability of turbine casings.

The application discloses a kind of based on mould casting parting surface with intelligent polishing device and its operating method, it is related to mould polishing technical field, including polishing main body, the inner wall of polishing main body is provided with roller conveyor, and the top of roller conveyor is placed with mould, and one end of polishing main body top is fixedly connected with support plate, one side of support plate outer wall is fixedly connected with electric telescopic table, and the output end of electric telescopic table is threadedly connected with support table.The application is provided with a plurality of grooves in the bottom of grinding ring, so that the air below guide block is discharged through the fitting surface of grinding ring and mould under the traction of groove, further solve the problem that the heat generated by traditional mould casting parting surface with intelligent polishing device cannot be quickly dispersed during use, resulting in surface mould expansion due to heat, inner layer mould constraint expansion, thereby generating tensile stress, and heat fatigue crack can be caused by reciprocating, thereby exacerbating mould deformation.

The invention discloses a welding process of a high-strength onboard load training device, which adopts a structural combination of a plurality of layers of steel plates and a high-ductility alloy connecting piece, and utilizes a composite welding device consisting of a welding head, a gas generating ring, a tempering heating ring and a slow cooling gas curtain ring which are coaxially arranged. The synergistic effect of an electric arc heat source and a laser heat source can be achieved in the welding process, a deep penetration weld joint is formed, and sufficient metallurgical bonding of the multi-layer steel plate and an alloy connecting piece is ensured. And in cooperation with annular protective gas, local tempering and slow cooling control, the welding seam structure can be effectively improved, the residual stress can be reduced, cold cracks and fatigue cracks are prevented, and therefore the strength and stability of a welding joint are remarkably improved.

The application belongs to the technical field of cement soil preparation, and particularly relates to a composite cement soil prepared from seawater, nano-silicon dioxide and polyvinyl alcohol fiber and a preparation method thereof, which comprises 63-70% of dry soil powder, 9-10% of Portland cement, 1.8-2.2% of nano-silicon dioxide, 0.6-1.2% of polyvinyl alcohol fiber, 0.2% of dispersant and 16.4-25.4% of seawater. The composite cement soil can not only significantly reduce the dependence on fresh water resources, but also effectively solve the problems of seawater corrosion and deterioration caused by fatigue cracks due to long-term cyclic loading, thereby significantly improving the mechanical strength of the cement soil foundation and prolonging the service life of the cement soil foundation in the coastal environment, and the composite cement soil also has high economic benefits. The synergistic effect of the nano-silicon dioxide and the polyvinyl alcohol fiber significantly enhances the mechanical properties, crack resistance and seawater corrosion resistance of the cement soil, and effectively inhibits the brittle failure of the cement soil, so that the cement soil can be stably applied in the coastal soft soil foundation reinforcement engineering for a long time.

This utility model relates to the field of wiring harness rubber sleeve technology, and more particularly to a rubber sleeve for automotive door wiring harnesses. It includes a main body mechanism for improving structural strength, on which a connecting mechanism for stable connection with the vehicle door body is provided. The main body mechanism includes a telescopic sleeve, with connecting tubes fixedly connected to both ends of the telescopic sleeve. Multiple annular iron plates are installed inside the telescopic sleeve, and circular plates are fixedly connected to each of the annular iron plates. This utility model significantly improves the overall structural strength of the device by setting up the main body mechanism. By using EPDM rubber and adding 5 phr microencapsulated antioxidants, the wear resistance of the telescopic sleeve and connecting tubes is improved, effectively resisting fatigue cracks caused by repeated bending. The multiple annular iron plates enhance mechanical support, disperse frictional stress, prevent accelerated wear and cracking of the vehicle body sheet metal, and improve the service life of the device.

The present application relates to a method for predicting fatigue crack propagation rate of a diffusion bonded dissimilar titanium alloy laminate structure, which is based on the mechanical properties of the constituent materials of the dissimilar titanium alloy laminate structure, i.e., the quasi-static tensile properties of the two titanium alloy plies. The method for predicting fatigue crack propagation rate of the diffusion bonded dissimilar titanium alloy laminate structure first establishes the relationship between the fatigue crack propagation rate of the laminate structure and the mechanical properties of the laminate structure, and then establishes the relationship between the mechanical properties of the laminate structure and the mechanical properties of the dissimilar titanium alloy single ply, thereby describing the relationship of the fatigue crack propagation rate of the laminate structure. Compared with the prior art, the method of the present application has the advantages of simple and convenient test, engineering precision, rapid and practical, etc., and effectively reduces the test cost and test time required for crack propagation test of the dissimilar titanium alloy laminate structure processed from different parameters.

This utility model discloses a fracture-resistant bolt connection pair structure for long-span steel bridges, including a bolt body, an anti-loosening nut assembly, an anti-corrosion washer assembly, a first steel bridge connection plate, and a second steel bridge connection plate. This utility model relates to the field of steel bridge connection structure technology. This fracture-resistant bolt connection pair structure for long-span steel bridges forms a dual stress dispersion structure through a tapered connector between the bolt head and the bolt segment, and four U-shaped stress relief grooves on the bolt segment. This significantly reduces the stress concentration coefficient at the bolt connection, preventing fatigue crack initiation under long-term alternating loads. Simultaneously, the main nut and auxiliary nut, in conjunction with an annular boss, compress the nitrile rubber elastic bushing, continuously compensating for preload attenuation caused by vibration, achieving a preload retention rate of over 90%. This solves the problem of uneven bolt stress caused by loosening of traditional nuts. It ensures the fracture-resistant performance of the bolt connection pair from both "fatigue resistance" and "loosening prevention" dimensions, meeting the core stress requirements of long-span steel bridges.

The pneumatic curtain wall comprises a connecting mechanism, a main shaft of the connecting mechanism is arranged in a cylindrical connecting base in a penetrating mode and provided with an arc-shaped groove, and a torsional spring is arranged on the main shaft in a sleeving mode so as to provide elastic damping when two connecting blades rotate relatively. The angle limiting mechanism drives clamping nails inserted into the through holes of the blades to be clamped into the arc-shaped grooves through reset springs so as to limit the rotation range. According to the pneumatic curtain wall, the problems of visual disorder caused by free rotation and noise and fatigue cracking caused by lack of buffering are effectively solved through cooperative cooperation of torsional spring damping and staple bolt limiting; the elastic damping is used for absorbing impact energy, the service life is prolonged, and it is ensured that the curtain wall presents the uniform and controlled rhythm dynamic visual effect through precise limiting.

The invention belongs to the field of material characterization evaluation, and particularly relates to a method for quantitatively characterizing fatigue crack full-life characteristics. Selecting materials, preparing a fatigue test sample, and treating the surface of the sample into a smooth state; dividing the samples into a group A and a group B, and performing high-resolution X-ray three-dimensional imaging; putting the group A sample into an in-situ fatigue device, loading to fatigue fracture, and recording the fracture cycle times; selecting a sample similar to the microstructure feature of a certain sample in the group A from the group B, and carrying out step-by-step progressive in-situ fatigue three-dimensional imaging experiment, three-dimensional reconstruction, three-dimensional processing and three-dimensional visualization; according to the fracture position, reversely and sequentially determining fatigue crack information of each fatigue stage according to a three-dimensional scanning sequence, and performing three-dimensional quantitative characterization; drawing the fatigue crack sizes of all stages into a graph, and fitting and extrapolating to obtain cycle times when the fatigue crack sizes are 0; and establishing a fatigue crack full-life characteristic pattern.

The invention discloses an early fatigue damage detection method for a rare earth-containing steel rail. The method comprises the following steps: 1) ultrasonic multi-angle probe positioning; 2) preparing and breaking a sample; 3) performing scanning electron microscope and energy spectrum analysis; 4) observing a metallographic structure: analyzing a microstructure around the fracture by adopting a metallographic microscope; and 5) microhardness testing: carrying out high-density hardness testing on a crack source and an adjacent region, and analyzing the correlation between the rare earth induced hardness distribution abnormity and fatigue crack initiation. The invention aims to provide the early fatigue damage detection and identification method for the rare earth element-containing steel rail material, a multi-step microscopic analysis means is adopted to identify a nuclear damage source, and a correlation mechanism between rare earth inclusions and fatigue crack formation is disclosed.

The application discloses a stress fatigue resistant titanium alloy for spectacle frame structural members and a preparation method thereof, relates to the technical field of titanium alloy materials, and provides the stress fatigue resistant titanium alloy, which is composed of the following components in mass percentage: Al 5.5-6.5%, V 3.5-4.5%, Ta 0-2.5%, Mg 0.1-0.2%, O 0.06-0.12%, N 0.05-0.1%, Fe 0.02-0.24%, Re 0.15-0.5% and Rh 0.15-0.5%, and the balance is Ti and inevitable impurities. The common action of the added elements Re and Rh restrains the diffusion of Al, Ta and V, and obviously refines the alpha phase, the grain size of which is about 5-20 mu m, the strength of the primary alpha phase and the transformed beta phase is well matched (the difference is 65.76-75.87 HV), and the probability of the fatigue crack along the transformed beta phase is reduced, so that the alloy has good stress fatigue resistance. The stress fatigue resistant (alpha+beta) type dual-phase titanium alloy provided by the application has low elastic modulus, the strength can reach 1098 MPa, the fatigue life can reach 27088 times, and the alloy has good stress fatigue resistance and can be used for the connecting structural members of spectacle frames.

This invention provides a rapid assessment method for fatigue cracks and scratches on the surface of metal components. It is a detection and analysis method for distinguishing between fatigue cracks and micro-scratches on metal surfaces, and for analyzing and predicting defect development. Its key feature is that it differentiates between fatigue cracks and micro-scratches by detecting and identifying the shape of the opening extending along the depth direction of the defect. This invention utilizes a large amount of data analysis to determine the shape of the defect opening edge, achieving clear differentiation and significantly reducing safety hazards caused by missed detections.

The utility model relates to the technical field of granulation compression rollers, and discloses a compression roller device and a dry type granulator with the compression roller device, the compression roller device comprises two main shafts, the radial section of a first shaft section, suitable for being installed with a compression roller, of each main shaft is a polygon, and the side edges of each polygon are arc edges; the two compression rollers are arranged in parallel in the axial direction, shaft holes matched with the first shaft sections in shape are formed in the compression rollers, and the shaft holes of the two compression rollers are arranged on the first shaft sections in a sleeving mode respectively. According to the compression roller device provided by the utility model, the radial cross section of the first shaft section is arranged to be the polygon of which the side edges are convex outwards or concave inwards to form the arc edges and the chamfers are arranged to be the arc angles, so that the hidden danger that stress is easy to remain on the edge of a working plane of a square column section structure is effectively eliminated, and the uniformity of hardness is better; the polygonal structure changes the distribution mode of roller pressure, avoids the problems of local indentation, sunken deformation, fatigue cracking and the like caused by stress concentration under high load, remarkably prolongs the service life of equipment, and improves the production effect of the dry type granulator.

The invention belongs to the technical field of tire performance testing, and discloses a sample preparation method for keeping a tire shoulder groove complete in a tire deflection fatigue test, and the method comprises the following specific steps: 1, obtaining the size of a groove structure, placing a to-be-detected tire on a laser scanner workbench, and setting scanning parameters to identify a tire shoulder pattern block and the groove structure; the actual size of a tire shoulder groove is accurately obtained through laser scanning, a three-dimensional image model is generated, and the most critical and most likely-to-fail original groove geometrical shape of a tire shoulder is completely reserved in combination with a vertical directional cutting technology; meanwhile, the rubber material at the bottom of the groove is not subjected to any secondary machining, so that the original vulcanization state, crosslinking density and internal stress state are kept, and the material performance of the manufactured tire is truly reflected; on the basis, the fatigue crack can be generated and expanded at a real position of stress concentration in an actual design structure, and the form and the rate of the fatigue crack are more fit with a failure mode in actual use.

The utility model discloses an axial floating type high-pressure ejector pin device, relates to the technical field of high-pressure ejector pin devices, and aims to solve the essential contradiction of rigid topology that a dynamic multi-physical field problem is simplified into a static mechanical model, and a synergistic effect mechanism of stress wave propagation, thermoelastic deformation and turbulence dissipation in a high-pressure system is ignored. According to the key points of the technical scheme, the ejector pin comprises a mounting pin sleeve, an ejector pin body is detachably connected to the interior of the mounting pin sleeve, an ejector pin head is fixedly connected to the upper end of the ejector pin body, a compression spring is fixedly connected to the interior of an insertion groove, and the compression spring is fixedly connected to the interior of the insertion groove. A pressing block is movably connected to the face, away from the inserting groove, of the pressing spring, a positioning pressing block is fixedly connected to the interior of the inserting groove, and a pressing ball and a clamping positioning block are clamped between the positioning pressing block and the ejector pin body. A local stress peak value is reduced to a material safety threshold value through elastic deformation, and fatigue crack initiation is effectively inhibited.

The invention belongs to the technical field of pipeline welding, and particularly discloses a welding prediction method and device suitable for a new energy natural gas pipeline. The method comprises the following steps: acquiring a load spectrum containing pressure fluctuation, temperature cycle and hydrogen partial pressure change; setting a target fatigue life threshold value; calculating a three-dimensional residual stress field through a thermal-mechanical coupling finite element model; the load spectrums are superposed, a critical plane method is combined with a Smith-Watson-Topper damage model to calculate the fatigue crack initiation life, and a hydrogen environment correction factor is introduced to quantify the hydrogen influence; with the standard reaching of the fatigue life as the constraint, welding parameters are optimized through an improved non-dominated sorting genetic algorithm; and outputting the optimal parameters to a welding system. According to the method, the problem that traditional welding parameter design lacks dynamic load and hydrogen environment coupling prediction capacity is solved, reverse design for reversely deducing process parameters from service requirements is achieved, and the reliability of welding quality and process formulation efficiency are remarkably improved.

The utility model relates to the field of wind power corollary equipment, in particular to a support limiting assembly and a cable installation support, which comprise an installation column connected with a tower drum, supports connected with the installation column and connecting pieces used for connecting the installation column and two adjacent supports so as to achieve fixed connection of the supports and the installation column. According to the cable mounting bracket, the mounting columns and the brackets are firmly connected by arranging the connecting pieces, so that the brackets are fixed on the tower drum while two adjacent brackets are mutually connected, the mounting convenience of the cable mounting bracket is effectively improved, the problems of welding spot falling, fatigue cracks and the like which are easily generated under high-frequency vibration in a traditional welding mode are solved, and the service life of the cable mounting bracket is prolonged. And the connection strength and stability are improved.

The application discloses a kind of non-saturated solidified soil fatigue cracking damage prediction methods based on energy-mechanics method.The application introduces the effective stress formula proposed by Lytton and gives the solution method of relevant parameters in combination with energy-mechanics method, obtains the damage density evolution trend of non-saturated solidified soil material, finally based on the theory of fracture mechanics and continuous damage mechanics, on the basis of Paris equation, introduce damage density function, and based on dissipation strain energy DSE, the expression form of J integral is obtained, so as to establish the damage evolution prediction model capable of characterizing the multi-crack cracking process.The application solves the problem that the previous solidified soil fatigue cracking model cannot effectively reflect the influence of unsaturated characteristics on soil material cracking, and the model is based on the basis of mechanics theory, can better predict the multi-crack fatigue cracking damage evolution process from the mechanism level of non-saturated solidified soil material fatigue cracking, and provides basis and guidance for the design of solidified soil material and solidified soil road structure.

The application particularly relates to a cast stainless steel multiaxial low-cycle fatigue prediction method, which comprises the following steps: measuring or calculating the axial strain amplitude and the corresponding axial stress, the shear strain amplitude and the corresponding shear stress, and the phase difference between the axial strain amplitude and the shear strain amplitude of a cast stainless steel concerned part; calculating the equivalent axial strain amplitude and the equivalent shear strain amplitude of the cast stainless steel concerned part after correction and containing the influence of thermal aging; and substituting the equivalent axial strain amplitude and the equivalent shear strain amplitude of the cast stainless steel concerned part after correction and containing the influence of thermal aging and the phase difference therebetween into a cast stainless steel multiaxial low-cycle fatigue prediction model containing the influence of thermal aging to calculate the multiaxial low-cycle fatigue life and the fatigue crack direction of the cast stainless steel after thermal aging. The cast stainless steel multiaxial low-cycle fatigue prediction method can accurately predict the fatigue life of the cast stainless steel under multiaxial low-cycle fatigue loading and the direction of fatigue crack initiation and initial propagation.

The present application relates to the technical field of bridge nondestructive testing, and particularly relates to a multi-modal guided wave steel bridge deck fatigue crack intelligent fusion detection method and system, the intelligent fusion detection method comprising: scanning a to-be-detected area of a steel bridge deck by using ACFM detection technology, positioning a suspicious area, and merging the suspicious area and a high-risk area to form a fine detection target set; based on the fine detection target set, outputting an EMAT detection instruction for guiding EMAT detection of each fine detection target by using a hybrid intelligent decision model, and performing targeted fine detection on the fine detection target to obtain EMAT characteristic parameters; combining the ACFM characteristic parameters and the EMAT characteristic parameters of the fine detection target into a fusion feature vector, and inputting the fusion feature vector into a PINN evaluation model comprising a second classifier, and outputting a final defect classification result of the fine detection target and a quantitative physical parameter of the defect by the PINN evaluation model. Through efficient cooperation of ACFM and EMAT, the present application realizes integrated intelligent detection of "screening-decision-fine detection-evaluation" from surface to internal fatigue cracks.

This utility model discloses a high-strength, damage-resistant bearing, relating to the field of bearing technology. The utility model includes an outer ring, with a sealing assembly on the inner wall of the outer ring. A cage is fitted onto the surface of the sealing assembly, and balls are slidably connected inside the cage. The sealing assembly includes two inner rings, each extending into the interior of the outer ring on one opposite side. This utility model utilizes the outer ring and a surface wear-resistant and pressure-resistant layer to directly resist the crushing and contact stress of external hard particles, preventing indentations or pits in the raceway. The hardened layer inhibits the propagation of plastic deformation to deeper layers, and the pressure-resistant load-bearing layer releases local stress through reversible elastic deformation, assisting the raceway in quickly restoring its shape after unloading. The surface carburized steel layer forms a tough base to absorb impact energy, preventing the ceramic layer from cracking downwards. The matrix reinforcement layer blocks fatigue cracks caused by internal defects, and the bearing matrix layer provides a stable load-bearing foundation, collectively improving damage resistance and service life.