104 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.

An in-situ fretting corrosion fatigue testing machine based on synchrotron radiation diffraction and three-dimensional (3D) imaging includes an axial fatigue loading system, a fretting loading system, and a corrosion environment control system, where the axial fatigue loading system includes a driving device, a load control device, and a load sensing device; the load sensing device is configured to measure an axial force and a normal force in real time; the driving device is configured to drive the load control device, thereby achieving axial displacement of the load control device; the load control device is configured to carry out axial fatigue loading of a specimen; and the fretting loading system includes a fretting wear device. The testing machine achieves real-time 3D imaging characterization of wear spot and crack morphology of a material in a fretting corrosion environment, as well as characterization of a residual stress evolution law.

The invention relates to the technical field of bridge engineering material tests, and discloses a bridge structure corrosion fatigue coupling test method and system based on artificial intelligence. The bridge structure corrosion fatigue coupling test method based on artificial intelligence comprises the following steps: accurately expressing interaction among physical fields by constructing a multi-physical field coupling mathematical model; a deep reinforcement learning algorithm is applied, an environment parameter cooperative control model is built, and multi-environment-parameter high-precision self-adaptive regulation and control are achieved; building an environment acceleration test equivalence mapping model, and balancing the optimal acceleration ratio and equivalence of the acceleration test; constructing a generalized predictive control model to achieve multi-physical field cooperative regulation and control; a real-time system identification and parameter updating model is constructed, multi-physical field interaction influence is compensated, and stable control is achieved; according to the method, the test environment control precision is improved, multi-environment-condition cooperative control is realized, the test period is shortened, the test authenticity and the result stability are improved, and reliable data support is provided for bridge structure safety assessment.

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 utility model provides a platy sample fixture for stress corrosion fatigue test, which comprises an upper chuck, a lower chuck, a corrosion container and a plurality of locking bolts, the upper end of the upper chuck is provided with a fatigue testing machine fixing part, and the lower end of the upper chuck is provided with a platy sample slot with a downward opening; an upper threaded hole communicated with the plate-shaped sample inserting groove is formed in the side wall of the upper chuck, the locking bolt is in threaded connection with the upper threaded hole, the plate-shaped sample inserting groove with an upward opening is formed in the upper end of the lower chuck, a lower chuck connecting hole is formed in the bottom of the corrosion container, and the lower chuck connecting hole is in threaded connection with the outer side wall of the lower chuck. And a lower threaded hole communicated with the plate-shaped sample slot is formed in the side wall of the lower chuck. By adopting the high-strength corrosion-resistant alloy and the acrylic solution pool, the plate-shaped sample clamp for the stress corrosion fatigue test has excellent corrosion resistance and mechanical strength, the stability of a sample in a corrosive medium is ensured, so that the accuracy and the reliability of a test result are improved, meanwhile, a lower chuck connecting hole is in threaded connection with the outer side wall of the lower chuck, and the stability of the test result is improved. And the corrosive liquid is prevented from leaking.

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.

Corrosion fatigue test cell (1) and peripheral system (2) with high chemical resistance for combined mechanical and corrosive stress at elevated temperatures, characterized in that the materials in contact with the medium consist exclusively of the highly resistant plastics PTFE, FKM, PVDF and glass.

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 application discloses a simulation and prediction method for corrosion fatigue evolution process of a steel structure, and comprises the following steps: establishing a whole finite element stress simulation model of the steel structure, wherein a local finite element corrosion fatigue simulation model insertion gap of the steel structure is reserved on the whole finite element stress simulation model; establishing a local finite element corrosion fatigue simulation model of the steel structure, wherein a coupling-related steel structure finite element corrosion simulation unit and a steel structure finite element fatigue simulation unit are contained in the local finite element corrosion fatigue simulation model of the steel structure; inserting and binding the local finite element corrosion fatigue simulation model of the steel structure in the local finite element corrosion fatigue simulation model insertion gap of the steel structure to form a whole finite element corrosion fatigue simulation model of the steel structure; and obtaining simulation and prediction results of the corrosion fatigue evolution process of the steel structure through operation of the whole finite element corrosion fatigue simulation model of the steel structure. Multi-scale and coupling simulation of the whole process of corrosion pit formation and crack propagation is realized.

The invention belongs to the technical field of metal material stress corrosion test, and relates to a deep sea simulation test device for dynamic and static loading process, the main structure of the deep sea simulation test device comprises a pressure-resistant test cabin, and a loading sample piece, a pressure-resistant reference electrode and an annular auxiliary electrode arranged in the pressure-resistant test cabin, the loading sample piece is completely arranged in the pressure-resistant test cabin, and the annular auxiliary electrode is arranged in the pressure-resistant reference electrode. An adapter is connected with a dynamic and static loading system after penetrating through a cabin to perform static or dynamic stress loading, a pressure-resistant electrochemical test system is adopted to perform electrochemical characterization, test or polarization potential application, and a multi-factor control system is adopted to control main deep sea environmental factors such as temperature, pressure and dissolved oxygen content. High-precision and high-reliability test data can be quickly obtained, and corrosion electrochemical behaviors in stress corrosion and corrosion fatigue processes of metal materials in a deep sea simulation environment can be more truly reflected; the method provides support for metal material in-situ slow strain rate stress corrosion and corrosion fatigue test in a deep sea simulation environment and electrochemical test and characterization in the process.

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 invention relates to the technical field of material fatigue performance testing, in particular to a corrosion fatigue test clamp and a testing machine, and the corrosion fatigue test clamp comprises a base clamp, a medium containing groove, a sample clamping assembly and an upper end fastener which are coaxially assembled; the outer side of the bottom of the base clamp is provided with a first connecting part for connecting a lower end chuck of a testing machine, the inner side of the bottom is provided with a bearing boss extending upwards, the outer peripheral surface of the bearing boss is provided with a second connecting part, and the inner wall is provided with a third connecting part; the medium containing groove is formed in the base clamp, and a fourth connecting part detachably connected with the second connecting part is arranged at the bottom of the medium containing groove, so that a cavity surrounding the sample is formed; the sample clamping assembly is connected with the third connecting part, and the bottom end of the sample clamping assembly abuts against and fixes the medium containing groove. The upper end fastener is connected with the lower part of the sample; the corrosion fatigue test clamp provided by the invention can keep the sample clamping stability and the medium sealing reliability in a high-frequency corrosion fatigue test.

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.