69 results about "Corrosion fatigue" patented technology

The invention relates to the technical field of pipeline stress fatigue detection, and discloses a natural gas station elbow tee joint stress fatigue digital intelligent analysis method and system and a product. The method comprises the following steps: establishing a multi-physics field coupling digital twinborn model of the elbow tee joint, integrating a geometric structure, material attributes and a fluid-solid coupling mechanism, and simulating flow-induced vibration stress and corrosion fatigue interaction; collecting real-time multi-source data of the elbow tee joint; real-time multi-source data is utilized to update boundary conditions and parameters of the digital twin model, and material constants are dynamically corrected through machine learning, so that self-calibration of the model is realized; performing stress distribution analysis based on the updated model to obtain stress field data, and performing fatigue crack propagation prediction in combination with real-time multi-source data to generate a prediction result; and based on the prediction result, evaluating fatigue failure risks, including crack growth rate, residual life evaluation and failure probability, and outputting alarm information or optimization decision information.

The invention discloses a high-speed rail vehicle body aluminum alloy material corrosion fatigue performance simulation method and system, and belongs to the technical field of material corrosion fatigue testing. The method comprises the following steps: acquiring multi-source data of a high-speed rail body aluminum alloy material on an actual service route; establishing a material corrosion conversion coefficient database; obtaining an equivalent mapping relation based on the service environment and the load input set; generating a laboratory equivalent accelerated environment spectrum; and executing the laboratory equivalent accelerated environment spectrum, obtaining material failure data, and if the comparison difference is not less than a preset threshold value, correcting the calculation parameters of the equivalent mapping relation and regenerating the spectrum system. Through synchronous acquisition and fusion analysis of the multi-source environmental data and the mechanical load and in combination with the corrosion conversion coefficient database construction and closed-loop verification optimization method, the problem of test result distortion caused by separation of a laboratory simulation environment and an actual service condition in the prior art is solved.

The invention provides corrosion-fatigue-resistant ultrahigh-strength maritime work steel and a preparation method thereof, and relates to the technical field of maritime work steel manufacturing. The maritime work steel comprises the following components in percentage by mass: 0.04 to 0.07 percent of C, 0.20 to 0.26 percent of Si, 1.45 to 1.60 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.015 percent of S, 1.44 to 1.52 percent of Cr, 1.44 to 1.52 percent of Ni, 0.88 to 0.96 percent of Cu, 0.08 to 0.12 percent of Nb, 0.08 to 0.12 percent of Sb and the balance of Fe and inevitable impurities. The corrosion-fatigue-resistant ultrahigh-strength maritime work steel is prepared through raw material smelting and casting, austenitizing heat treatment, multi-pass hot rolling and cooling and temperature control. The corrosion resistance, the fatigue resistance and the corrosion fatigue resistance of the ultrahigh-strength maritime work steel are remarkably improved while the mechanical property of the ultrahigh-strength maritime work steel is improved, and the ultrahigh-strength maritime work steel has great significance in guaranteeing safe and stable operation of ocean engineering.

The invention provides a bridge parallel steel wire pull sling corrosion fatigue residual life prediction method, and relates to the technical field of bridge safety assessment, and the method comprises the steps: obtaining first information and second information; establishing a random traffic flow model based on the first information; based on the second information and preset bridge pavement irregularity, cable force time history analysis considering vehicle-bridge dynamic response is carried out, and a response time history of a bridge system is obtained through analysis; processing the response time history based on a rain flow counting method to obtain all stress amplitudes of the bridge and corresponding cycle times; and calculating the corrosion fatigue duration of the bridge parallel steel wire pull sling by adopting a time increment method based on all the stress amplitudes and the corresponding cycle times, and outputting the fatigue life of the bridge parallel steel wire pull sling. The method is used for evaluating the residual life of the pull sling in the service period along with the change of the external environment, the evaluation model can be dynamically updated in combination with an actual inspection result, and effective combination of a theoretical model and actually measured data is realized.

The invention provides a ship and ocean engineering structure corrosion fatigue crack propagation rate prediction method based on machine learning. The method comprises the following steps: S1, obtaining all characteristic variables; s2, screening core influence factors from all feature variables through a feature selection algorithm to obtain feature data; s3, establishing a machine learning prediction model which adopts one of a plurality of machine learning algorithms, and inputting the feature data into the machine learning prediction model to learn a nonlinear mapping relationship between corrosion fatigue crack growth rate data and the selected variables, optimizing the machine learning prediction model by using a hyper-parameter optimization method to obtain a trained model; and S4, inputting feature data of a to-be-predicted target into the trained model for prediction to obtain the corrosion fatigue crack growth rate of the to-be-predicted target. The method is suitable for service safety analysis and life evaluation of key facilities such as ships, ocean platforms and submarine pipelines.

The embodiment of the invention discloses a steel cable whole-process life prediction method considering corrosion-fatigue coupling. The method comprises the steps that the initial stress of a to-be-predicted steel cable is acquired; randomly generating an initial crack depth x0 and a critical crack depth xc of each segment; according to the diffusion coefficient of steel wire metal ions to the corrosion solution, the saturated ion concentration of the metal solution in the pit, and the delta Kth and stress distribution of each section, calculating the time tc for the corrosion pit of each section to reach the critical corrosion pit depth; starting from the subsection with the shortest tc, sequentially executing the following operations according to time steps: determining a target subsection in a crack propagation stage in the current time step; loading a stress cycle with a set step length on the basis of x0 of each target segment, and calculating a crack propagation depth x after loading of each target segment; and judging whether x of each target segment reaches xc of each target segment or not, judging whether the steel wire is invalid or not, and finally obtaining the service life of the steel cable. The embodiment of the invention can improve the accuracy of steel cable life prediction.

The invention provides a parallel steel wire corrosion fatigue test device, and relates to the technical field of steel wire physical tests, the parallel steel wire corrosion fatigue test device comprises a closed cylinder, two ends of the closed cylinder are provided with openings for a test steel wire to penetrate, and the two ends of the test steel wire penetrate out of the closed cylinder and then are respectively clamped and fixed with an upper chuck and a lower chuck of a fatigue testing machine; the inner pipe is arranged in the closed cylinder, the test steel wire penetrates through the inner pipe in the axial direction, and the inner pipe is provided with a plurality of cracks with different sizes and / or different forms in the axial direction; the bag body is arranged on the inner wall of the inner pipe, the bag body has a first state and a second state which can be switched, and the aerial fog assembly communicates with the closed cylinder and is used for introducing corrosive aerial fog into the closed cylinder. And a corrosion medium and a fatigue load are synchronously applied to the local area to realize a real-time coupling effect of the corrosion medium and the fatigue load, so that corrosion fatigue test data with higher engineering authenticity and representativeness are obtained.

The invention belongs to the field of corrosion fatigue performance, and particularly discloses a milling workpiece corrosion fatigue life prediction model construction method and a process parameter optimization method.The milling workpiece corrosion fatigue life prediction model construction method comprises the steps that a surface quality prediction model is constructed based on process parameters and corresponding workpiece surface states obtained through tests, and the workpiece surface states comprise surface roughness and hardness; introducing a fatigue stress concentration factor and a work hardening ratio into the initial fatigue life model to respectively reflect local stress concentration caused by surface topography and machining surface hardening caused by milling, and performing surface roughness correction and surface hardness correction on the initial fatigue life model; obtaining a fatigue life model related to the surface state of the workpiece and the corresponding corrosion fatigue life; and combining the surface quality prediction model and the fatigue life model to form a corrosion fatigue life prediction model of the milling workpiece. According to the method, corrosion fatigue life prediction and process parameter optimization of the nickel-aluminum bronze milling workpiece can be realized, and important guidance is provided for actual processing.

The invention provides a method for improving the corrosion fatigue performance of aluminum and / or magnesium alloy by combining laser peening with peak aging and an aluminum and / or magnesium alloy finished product. The method comprises the following steps: S1, carrying out solution treatment on to-be-treated aluminum and / or magnesium alloy; s2, the aluminum and / or magnesium alloy subjected to solution treatment is subjected to laser shot peening treatment; and S3, the aluminum and / or magnesium alloy subjected to laser peening treatment is subjected to peak aging treatment. According to the method, the initial nanometer precipitated phase can be dissolved through the solid solution treatment to form a single-phase supersaturated solid solution, dislocation pinning can be effectively promoted through the laser shot peening treatment, more and more stable gradient dislocation structures are reserved in the subsequent peak value aging process of the aluminum and / or magnesium alloy, power is provided for nucleation and growth of the nanometer precipitated phase, and the mechanical property of the aluminum and / or magnesium alloy is improved. And a surface layer overaging state-core peak aging state continuous transition structure is constructed in combination with subsequent peak aging treatment, and the continuous transition structure endows the aluminum and / or magnesium alloy with corrosion fatigue resistance and high strength characteristics.

The application discloses a steel-concrete composite beam bridge negative bending moment area rigidity degradation analysis method and system. The method first establishes a bridge deck deterioration numerical simulation model, fits the quantitative relationship between the deterioration parameters and the rigidity, and forms a bridge deck deterioration rigidity evaluation model; then, taking the steel-concrete relative slip as an index and the concrete rust expansion cracking as a boundary, the welding bolt reduction coefficient is determined through simulation and test in stages, and the steel-concrete collaborative degradation rigidity evaluation model is formed in combination with the interface slip reduction; then, a corrosion-fatigue coupling test is carried out on a scaled beam test piece, a multi-component deterioration rigidity degradation model is proposed by combining the two types of models, and a reliable calculation model is formed after numerical verification; finally, a deterioration parameter time-varying evolution model is established, the rigidity at different service times is calculated, a full-time domain calculation framework is constructed, and the precise analysis and full-time domain evaluation of the steel-concrete composite beam bridge negative bending moment area rigidity degradation are realized.

The application discloses a seamless square tube for a crane boom of offshore engineering, relates to the technical field of steel pipes, and improves the purity of square tube steel, solves the problems of insufficient corrosion fatigue resistance of the existing seamless square tube for the crane boom of offshore engineering in a harsh marine environment and poor low-temperature toughness caused by the difficulty in balancing the strength and toughness, and the seamless square tube comprises the following components: C: 0.14%-0.18%, Si: 0.25%-0.45%, Mn: 1.40%-1.60%, P<=0.015%, S<=0.010%, Cu<=0.20%, Ni<=0.25%, Cr: 0.30%-0.40%, Mo: 0.25%-0.30%, V: 0.05%-0.09%, W: 0.40%-0.60%, Nb<=0.05%, Ti<=0.05%, and Al: 0.02%-0.05%.

The utility model discloses an integrated corrosive liquid circulating device for stress corrosion fatigue test, and particularly relates to the field of material testing, the integrated corrosive liquid circulating device comprises a storage box, one side of the storage box is connected with a limiting assembly through a water pipe, the limiting assembly comprises a test box, and electric telescopic rods are symmetrically and fixedly arranged in the test box; sliding blocks are fixedly connected to one sides of the electric telescopic rods, connecting frames are arranged on one sides of the sliding blocks, rotating shafts are arranged at the two ends of each connecting frame, buffering pads are fixedly arranged on one sides of the connecting frames, and a limiting plate is fixedly arranged on the other side of the interior of the storage box. According to the utility model, the limiting assembly, the connecting frame and the limiting plate are matched to limit the sample, so that the position of the sample is ensured to be stable in the test process, displacement or shaking caused by factors such as flowing of corrosive liquid and vibration of test equipment is avoided, and further non-uniform stress distribution caused by change of the position of the sample is effectively avoided; therefore, the reliability of test data is influenced.

The invention discloses a cyclic load and electrochemistry collaborative testing device and a testing method, and belongs to the technical field of material corrosion and mechanical property testing. The device comprises a load applying unit, an electrochemical testing unit, a sample clamp and corrosion pool unit and a data synchronization control module. The test method comprises the steps of sample preparation, device assembly, static electrochemical test and electrochemical collaborative test under cyclic load. The core of the invention lies in that through the data synchronization control module, the electrochemical test is accurately controlled to be triggered when the cyclic load reaches a peak value, and in-situ and synchronous coupling of a dynamic stress field and a corrosion environment is realized. According to the method, the defect that fatigue and corrosion tests are separated in the prior art is overcome, the complex working condition of the material in actual service can be truly reduced, the acceleration or inhibition effect of cyclic stress on the surface corrosion behavior of the material is accurately represented, and the research and evaluation precision of the corrosion fatigue performance and failure mechanism of the material is remarkably improved.

The application discloses a granite corrosion fatigue life prediction method based on approximate conformal dimension evolution, relates to the technical field of material damage mechanics, and comprises the following steps: collecting crack images under different cycle numbers of granite subjected to the action of corrosion medium and cyclic load, and constructing a crack set; calculating the approximate conformal dimension of each observation point after pretreatment and obtaining an evolution sequence by monotonicization; driving to establish a discrete damage evolution relationship by using a dimension increment, and calibrating parameters by using early data; and extrapolating damage accumulation of an unobserved interval, and determining the prediction life when a threshold is reached. The application integrates corrosion parameters into edge weights, realizes joint measurement of environment and crack geometry, selects the minimum box dimension by traversing parameters, overcomes single measurement limitations, depicts a corrosion fatigue accumulation process by using an increment-driven recursive model, realizes effective prediction under partial life data by using two-stage calibration and early data extrapolation, and improves engineering practicability and early warning capability.

The utility model provides an ocean engineering material high flux corrosion test system, the test system comprises a loading system and an environmental system, the loading system comprises a loading support, a loading device, a clamp assembly and a controller, the environmental system comprises an environmental box, a liquid medium regulation and control device and a gas medium regulation and control device, the liquid medium regulation and control device and the gas medium regulation and control device are respectively connected with the environment box, the environment box is arranged on the loading bracket, is used for placing a test sample and can load a liquid medium and a gas medium for testing, and the clamp assembly penetrates through the environment box to connect the test sample with the loading bracket and the loading device. Through the arrangement of the high-flux corrosion test system, the corrosion environment of global typical sea areas can be simulated, meanwhile, constant stress load, slow strain load and alternating cyclic load can be independently loaded on batch samples, automatic monitoring of the whole test process can be achieved, comprehensive coordination of factors such as different environments and loads is achieved, and the test efficiency is improved. And the corrosion fatigue test efficiency is improved.

The present application relates to the field of fatigue test, in particular to a kind of tubular sample dynamic liquid lead bismuth alloy loop corrosion fatigue test device and use method.Tubular sample is installed between upper and lower base, the lower end of tubular sample is sequentially communicated with the through hole in lower base, liquid lead bismuth alloy inlet pipe, the upper end of tubular sample is sequentially communicated with the through hole in upper base, liquid lead bismuth alloy outlet pipe.Tubular sample outer paste thermocouple real-time monitoring and control liquid lead bismuth temperature, outer surface installation extensometer strain measurement.Liquid lead bismuth is driven by electromagnetic pump through storage tank, enters reaction kettle and is heated and oxygen is controlled, after flow rate is measured by flowmeter, it flows into tubular sample, then backflow to storage tank and forms loop.The outer wall of loop pipeline is equipped with armored electric heating and thermal insulation cotton, to ensure temperature control.The present application realizes the accurate control of high-temperature liquid lead bismuth temperature, dissolved oxygen and flow rate, supports dynamic strain control fatigue test, and evaluates the corrosion fatigue performance of material in flowing high-temperature liquid lead bismuth environment.

The invention discloses a steel structural member coupling loading test method considering a corrosion fatigue time similarity ratio. The method comprises the following steps: (a) determining a natural corrosion annual average thickness loss rate Dn of a steel structural member service site; (b) determining an accelerated corrosion test environment based on the natural corrosion environment type; (c) determining a daily average thickness loss rate Dt of an accelerated corrosion test, and calculating a corrosion time similarity ratio ac; (d) determining a fatigue load action frequency design value Nd according to the service condition; (e) determining a lower limit value NT of fatigue test loading times, and calculating a fatigue test loading frequency f required for reaching a fatigue time similarity ratio af; (f) establishing a corrosion fatigue coupling damage evolution model, and establishing a relationship between a corrosion fatigue coupling loading test life Nf and a corrosion fatigue test similarity ratio coefficient ak; and (g) calculating the deviation between the test life Nf under the test working condition and the life N1 when the consistency of the corrosion fatigue time similarity ratio is considered, and evaluating the corrosion fatigue performance of the structural member under the actual environment corrosion and load working condition.

The utility model provides an environmental box and a test system for ocean engineering material corrosion test, the environmental box comprises a box body and an upper cover assembly, the upper cover assembly is arranged at the upper part of the box body, the box body and the upper cover assembly are matched and sealed to form a chamber required by the corrosion test, and a corrosion medium test environmental condition is formed in the chamber. The environment box comprises a cavity, at least two samples can be arranged in the cavity, the environment box further comprises a high-speed spraying assembly, the high-speed spraying assembly corresponds to the samples and is used for spraying a high-speed test medium to the surfaces of the samples, and the test medium comprises a liquid medium and / or a gas medium. According to the utility model, through the arrangement of the high-speed jet assembly, the environment state of a ship during operation can be simulated, and the corrosion fatigue performance research of an ocean engineering material in various ocean environments can be realized; by arranging the multiple samples in the cavity, batch testing of the multiple samples in the same environment can be achieved, the testing efficiency is improved, and the testing period is shortened.

The invention discloses a method for evaluating the corrosion fatigue crack growth rate of a steel member by fusing a physical model and data driving. The method comprises the following steps: firstly, acquiring data through pre-corrosion and fatigue tests, and calculating a stress intensity factor by adopting M-integral; and further, analyzing the characteristic correlation by using a Pearson coefficient and an SHAP-XGBoost method and quantifying the contribution degree of each parameter to crack propagation, thereby proposing a Paris correction formula. Then, a mixed loss function is constructed, data-driven artificial neural network loss and physical model loss based on a Paris correction formula are considered at the same time, and the data-driven artificial neural network loss and the physical model loss are harmonized through a physical influence coefficient; and finally, performing cycle training and hyper-parameter optimization on the mixed model by adopting a Bayesian optimizer until the prediction precision reaches a set threshold value, thereby realizing high-precision crack growth rate prediction. The prediction method has high precision and high reliability, and can be suitable for crack propagation prediction of actual engineering steel structures such as bridges, civil engineering and ocean engineering.

The invention belongs to the technical field of suspension bridge sling tests, and discloses a suspension bridge straddle type sling tension-bending-torsion friction corrosion fatigue test device and method, and the device comprises a rack module, a driving module, an environment simulation module and a data acquisition and processing module. The rack module comprises a plurality of supporting stand columns, a middle cross beam, a supporting platform, two vertical beams, a top cross beam and a rack top plate. The driving module comprises a servo controller, a servo electric cylinder and a heavy load rotary table; the driving module further comprises a ball screw mechanism and a sling groove, the sling groove is sleeved with the middle of the sling, and the data collecting and processing module comprises a first tension sensor, a second tension sensor, a first high-speed camera, a second high-speed camera and a third high-speed camera. Through cooperation of multiple modules, the functions of fatigue loading, bending simulation, torsion application, corrosion environment simulation and the like are integrated, and the multi-factor coupling effect of tension, bending, torsion, friction, corrosion and fatigue is accurately reproduced.

The invention discloses a method for predicting and evaluating corrosion fatigue residual life of an oil pipeline, and belongs to the technical field of structural integrity management and safety engineering of oil and gas conveying pipelines. Comprising the following steps: acquiring pipeline corrosion defect original data, carrying out defect merging and identification to obtain a defect sample set, selecting a target defect sample, and obtaining the defect depth of the target defect sample at the detection moment; based on the defect sample set, statistical modeling is carried out on the corrosion defect depth, the maximum defect depth in a preset service period is obtained through prediction, and safety margin evaluation is carried out; constructing an electrochemical corrosion life model fused with a temperature-soil resistivity correction factor to predict the residual life; and carrying out pipeline residual strength evaluation and decision making by adopting an optimized ASME B31G standard and an SY / T 6151 standard. According to the method, all links are seamlessly connected, a complete solution from theory to practice and from technology to economy is provided, the operation and maintenance cost is effectively reduced, and the pipeline safety management level is improved.

The invention provides an inhaul cable corrosion fatigue coupling evaluation method in combination with a train operation environment, and relates to the field of train operation environment evaluation.The method comprises the steps that train operation parameters and environment parameters are collected, an inhaul cable mechanical model and an inhaul cable corrosion model are constructed, and inhaul cable stress time history response under the train load effect is simulated through finite element software; and the corrosion condition is determined by combining environmental factors. The accumulated damage degree of the inhaul cable is obtained through corrosion fatigue coupling analysis. And based on this, establishing a performance evaluation index, and judging the safety of the inhaul cable. And the evaluation result is used for making a maintenance plan to realize accurate maintenance. According to the method, coupling analysis is carried out on the two factors, the limitation that only a single factor is considered in a traditional evaluation method is avoided, the performance degradation condition of the inhaul cable under the actual working condition can be reflected more accurately, an evaluation result closer to the actual condition is obtained, the accuracy of inhaul cable evaluation is improved, the bridge safety is enhanced, and the method is suitable for popularization and application. The maintenance cost is reduced.

A stress fatigue corrosion test method for sealed steel wire ropes used in bridge suspension cables includes the following steps: sample preparation, corrosion solution preparation, corrosion test implementation, and corrosion analysis. This invention provides a standardized method for stress corrosion fatigue testing of sealed steel wire ropes in a simulated atmospheric environment containing SO₂ and Cl⁻. Through a design of "closed-loop control - multi-source monitoring - data fusion," it achieves accurate reproduction and full-cycle monitoring of the simulated atmospheric environment containing SO₂ and Cl⁻, significantly improving the authenticity and reliability of the test results.

The invention discloses a steel box girder bridge corrosion fatigue life prediction method and system, and relates to the technical field of steel structure bridge life prediction. The method comprises the following steps: establishing an erosion pit initiation time calculation model considering a cyclic load acceleration effect; a short crack propagation time calculation model is established, and the model represents the corrosion environment intensity based on actually measured corrosion current and is coupled with the influence of the stress level; a long crack propagation time calculation model is established, and the model represents the corrosion environment intensity based on actually measured corrosion current and is coupled with the influence of the stress level; and adding the corrosion pit initiation time, the short crack propagation time and the long crack propagation time to obtain the total corrosion fatigue life of the steel box girder bridge in the corrosion environment. The problem that the corrosion and fatigue synergistic effect is difficult to quantify in the prior art can be solved.

The invention provides a seawater corrosion fatigue test system and method.The seawater corrosion fatigue test system comprises an upper fixing base, a lower fixing base and a salt bath assembly, the upper end and the lower end of a to-be-tested workpiece are clamped by the upper fixing base and the lower fixing base, the salt bath assembly is arranged between the upper fixing base and the lower fixing base, a salt bath solution is injected into the salt bath assembly, and the to-be-tested workpiece is placed in the salt bath assembly; and the workpiece to be detected passes through the salt bath solution of the salt bath assembly. According to the seawater corrosion fatigue test system and method provided by the invention, the salt bath barrel is additionally arranged between the two fixed seats, and the to-be-tested workpiece and the salt bath barrel are elastically sealed in a multi-sealing manner, so that the sealing problem caused by vibration deformation of the to-be-tested workpiece under a fatigue test condition can be solved; the salt bath solution environment is applied to the to-be-tested workpiece, but the fatigue test of the to-be-tested workpiece is not influenced, so that the fatigue test of the to-be-tested workpiece in the salt bath environment is realized, and a fatigue test result under a seawater condition can be obtained.

The invention discloses a method for evaluating corrosion-fatigue damage and service life of a railway bridge inhaul cable and an anchoring end thereof. The method comprises the following steps: acquiring a vibration acceleration time history of a target bridge inhaul cable and the anchoring end thereof; the instantaneous cable force of the inhaul cable is obtained based on the vibration acceleration time history; obtaining a stress parameter based on the instantaneous cable force; obtaining an equivalent stress amplitude based on the stress parameter and an S-N curve; based on the equivalent stress amplitude and the parameters of the S-N curve, fatigue damage in unit time is obtained; obtaining the fatigue life of the inhaul cable and the anchoring end thereof based on the fatigue damage; and obtaining the failure probability of the inhaul cable and the anchoring end of the inhaul cable based on the uncertainty of the S-N curve parameter in combination with the equivalent stress amplitude. The fatigue damage and the service life of the inhaul cable can be accurately evaluated.

This invention discloses a method and system for calculating the time-varying reliability of cable corrosion fatigue in cable-stayed bridges. The method includes establishing and validating a finite element model of the cable-stayed bridge; simulating the time history of fluctuating wind speeds in the main girder and main tower using the harmonic synthesis method; obtaining the cable stress time history through buffeting analysis; establishing a probability model of equivalent stress amplitude and cycle number using the rainflow counting method and Miner's theory; constructing a probability model of the depth of dangerous pits and corrosion depth of steel wires under different corrosion degrees based on measured data; establishing a multi-stage series formula coupling pit evolution, pit-crack transformation, and crack propagation; constructing a limit state equation with a 2% wire breakage rate as a threshold; calculating the time-varying reliability of the cable under different wind speeds and corrosion degrees using random sampling; and statistically analyzing the mean and standard deviation of corrosion fatigue life. This invention accurately reflects the wind-corrosion coupling and multi-stage failure mechanism, is computationally reliable, and has strong versatility, making it suitable for safety assessment and life prediction of cables in various types of cable-stayed bridges.

The application provides a 2Cr13 forging method for improving corrosion fatigue resistance of a last-stage blade of a steam turbine, which can realize grain refinement, carbide distribution optimization, surface integrity improvement and favorable residual compressive stress introduction by optimizing temperature gradient between forging heats and inserting surface treatment and heat treatment procedures in the whole forging process, so as to systematically improve service performance of the blade under corrosion-fatigue coupling conditions. The 2Cr13 forging method for improving corrosion fatigue resistance of a last-stage blade of a steam turbine comprises the following steps: top forging, first heat forging of a blank; the temperature of the first heat forging is 1135-1145 DEG C; pre-forging, second heat forging of the first intermediate blank after the top forging, the temperature of the second heat forging is 1125-1135 DEG C, and the second heat temperature is less than the first heat temperature and forms a gradient temperature difference of 5-20 DEG C; finish forging, third heat forging of the second intermediate blank after the pre-forging, the temperature of the third heat forging is 1030-1040 DEG C, and a blade forging piece is obtained.

The invention discloses a sucker rod corrosion fatigue influence factor analysis method based on double-model fusion, and belongs to the field of safety assessment of oil exploitation equipment. In order to solve the problems that in the prior art, analysis dimensions are limited, and prediction precision and model interpretability are difficult to consider at the same time, the method comprises the steps that firstly, a high-dimensional parameterized data set is generated through finite element simulation; secondly, analyzing and visualizing the independent nonlinear influence trend of each factor by adopting a generalized additive model (GAM); meanwhile, a high-precision XGBoost prediction model is constructed, and the global importance, local dependence and complex interaction of each factor are quantified in combination with an SHAP method; and finally, fusing double-model results to carry out cross validation and comprehensive evaluation. According to the method, high-precision prediction and high interpretability are combined, comprehensive insight of a multi-factor coupling effect is realized, and the robustness and credibility of an evaluation conclusion are remarkably improved through a built-in verification mechanism.

This utility model discloses a hydrogen storage cylinder corrosion resistance and airtightness testing device, relating to the field of hydrogen cylinder testing technology. It includes an environmental chamber, a control component, and an impact component. The environmental chamber has a freely opening and closing door on one side. The control component includes a telescopic mechanism for sealing and protecting the cylinder body and a rotating mechanism for controlling the cylinder's positioning. This utility model achieves corrosion fatigue life testing of the hydrogen cylinder by using an external air pump to circulate and discharge the hydrogen cylinder through the control component; it completes mechanical impact testing by impacting weak points in the cylinder body through the impact component; and it analyzes the changing trends of impact energy and lifespan decay of the hydrogen cylinder through a designed testing process, including control and benchmark groups, thereby predicting the remaining service life of the hydrogen cylinder under impact.