45 results about "Creep strain" patented technology

The invention discloses a concrete nonlinear creep explicit modeling method and system, and relates to the technical field of concrete structures and materials.The concrete nonlinear creep explicit modeling method comprises the steps that concrete creep test data under all conditions are collected, and a test data set is constructed; preprocessing the concrete creep test data of the test data set; a DBO algorithm is adopted to optimize hyper-parameters of the LGBM model, and the LGBM model is constructed and trained through the test data set and the optimal hyper-parameters; the input features of the trained LGBM model are screened through an SHAP additive interpretation method, and key feature parameters are obtained; and establishing a concrete nonlinear creep explicit calculation formula by using a PySR symbol regression tool and taking the key characteristic parameters as input and the creep strain as output. The concrete nonlinear creep explicit modeling method provided by the invention has both calculation precision and engineering practical value.

The application discloses a creep deformation statistical analysis method, and specific steps are as follows: step 001, obtaining creep deformation and time relationship of not less than three same size samples of same batch material or same batch parts under the same condition; step 002, selecting some typical time and corresponding creep strain, selecting a suitable statistical distribution function to statistically analyze the creep strain under the typical time, and fitting the distribution parameters; step 003, calculating the survival rate of the tested sample or part not more than a certain creep strain or the creep strain of the tested sample or part under a certain survival rate under the selected statistical distribution function, and drawing a P-C-T curve; through the method, the creep deformation of the material or the part can be statistically analyzed, and then the survival rate of the material or the part not more than a certain creep strain under a given condition can be calculated, which has important significance for accurately evaluating the creep performance of the material or the part.

The application discloses a kind of prediction methods of high-strength steel wire high temperature creep behavior of rust, belong to bridge cable safety assessment technical field.The method is first obtained by test the material intrinsic material parameters of rust high-strength steel wire test piece and un-rust high-strength steel wire test piece;Then three-dimensional scanning quantization corrosion morphology is used, the maximum pit depth of rust high-strength steel wire surface and the pit root radius of pit bottom are extracted, and then the stress concentration coefficient and the effective bearing area decay function after net section loss are calculated, and the corrosion damage index is introduced;On this basis, the creep strain rate prediction model considering local stress concentration, section loss and material damage is established.The prediction method of the application realizes the quantitative prediction from pit micro-morphology to macro creep behavior, and has great engineering application value for evaluating the safety and residual life of in-service bridge cable.

The application discloses a kind of bridge structure in concrete shrinkage and creep calculation method, equipment and storage medium, the method includes using initial strain method to calculate stress increment and creep strain increment in different period, and then calculate stress and creep strain at different time;According to the stress increment of different period, stress-strain relationship and creep coefficient fitting function calculation period Δt n+1 Internal concrete creep caused by unit equivalent node load increment;According to concrete shrinkage strain increment calculation period Δt n+1 Internal concrete shrinkage caused by unit equivalent node load increment.The application can accurately calculate the shrinkage and creep effect of concrete in the structure when applied to bridge structure analysis, greatly improves the calculation efficiency and saves storage space.

The invention provides a method for analyzing time-history stress relaxation of anchoring force of a pre-stressed anchor cable under high-pressure stress, and relates to the technical field of geotechnical engineering. According to the method, engineering geological investigation, ground stress testing and indoor triaxial rheological testing are systematically combined, a potential high-stress area is accurately recognized, key rheological parameters of a rock-soil body are obtained, and then the stress self-adaptive creep coupling constitutive model with the long-term strength of the rock body as the criterion is constructed; and finally, accurately predicting the time-history creep strain of the rock-soil body and the anchoring force loss of the anchor cable under the high stress condition through numerical calculation. According to the method, the defect that a traditional creep theory describes a nonlinear creep behavior in a high-pressure stress state and a prestress loss coupling mechanism is effectively overcome, and the prediction precision and reliability of mechanical response of an anchoring system are remarkably improved; a basis is provided for long-term stability evaluation and safety control of prestressed anchoring engineering under complex geological conditions, and geotechnical engineering anchoring design and safety early warning are developed towards the refined and intelligent direction.

This invention discloses a method and system for predicting the creep fatigue behavior of martensitic heat-resistant steel, relating to the field of high-temperature creep fatigue performance evaluation technology. The method includes: acquiring the microstructure evolution of copper-containing martensitic heat-resistant steel during the test process, obtaining the cyclic strength change rate based on the microstructure evolution, and calculating the creep rate of the copper-containing martensitic heat-resistant steel in the dislocation climb hard phase, as well as the dislocation density under cyclic loading conditions; based on the cyclic strength change rate, creep rate, and dislocation density, obtaining the elastic strain tensor, plastic strain tensor, and creep strain tensor of the copper-containing martensitic heat-resistant steel, and predicting the stress-strain evolution of the copper-containing martensitic heat-resistant steel under cyclic loading conditions based on the elastic modulus tensor; this invention overcomes the limitations of macroscopic creep fatigue behavior prediction methods and provides a new approach to revealing the influence of microstructure on creep fatigue performance.

The invention belongs to the technical field of bearings, and discloses a foil dynamic pressure radial gas bearing bump foil creep test method, which is characterized in that a miniature rubber block is inserted between a top foil and a rigid substrate, and the miniature rubber block is used as a flexible element, is in direct contact with the top foil, and deforms under the action of a compression load transmitted by the top foil; a monocrystalline silicon semiconductor strain gauge is pasted on the side face of the miniature rubber block, and the direction is perpendicular to the direction of the compression load; in the running process of the bearing, the output strain value of the strain gauge is monitored in real time through a data acquisition system; the semiconductor strain gauge is a sensitive element manufactured based on the piezoresistive effect of semiconductor monocrystalline silicon, the resistivity of a semiconductor crystal material is changed when the semiconductor crystal material is stressed in a certain direction and deforms, and strain, stress and the like are indirectly measured. The device has the beneficial effect that the problem that the creep strain is difficult to test in real time due to the tiny structure of the bump foil is solved.

The application discloses a structure suitable for creep supervision of P91 pipeline containing a soft area, which comprises a plurality of creep supervision measuring points fixedly installed on the outer wall of the P91 pipeline containing the soft area, wherein the creep supervision measuring points comprise a creep supervision measuring point upper layer and a creep supervision measuring point lower layer which are stacked together, and at least one of the creep supervision measuring points is located on the soft area of the P91 pipeline. The structure suitable for the creep supervision of the P91 pipeline containing the soft area can carry out the creep supervision on the soft area with the worst creep performance, the supervision object is more targeted, the creep strain law of the soft area of the pipeline can be accurately reflected, lossy detection such as hardness detection and metallographic detection does not need to be frequently carried out, no damage is caused to the pipeline, and more data support can be provided for the supervision and evaluation and life assessment of the pipeline. The application also discloses an evaluation method suitable for the creep supervision of the P91 pipeline containing the soft area, which has the same advantages as the structure suitable for the creep supervision of the P91 pipeline containing the soft area.

The invention relates to a method for constructing a rock salt nonlinear damage creep constitutive model considering a temperature effect. The method comprises the following steps: constructing an element combination model formed by connecting an elastomer, a nonlinear viscous body and a generalized Kelvin body in series as a basic framework of the rock salt nonlinear damage creep constitutive model considering the temperature effect; introducing a damage variable related to time and temperature; establishing a constitutive equation of the nonlinear viscous body of the salt rock; based on the constitutive equation of the salt rock nonlinear viscous body, deducing a total creep strain expression of a salt rock nonlinear damage creep constitutive model considering the temperature effect in a one-dimensional stress state; and carrying out uniaxial compression creep tests on the salt rock sample at different temperatures by adopting a graded loading mode to obtain strain-time data and a corresponding creep curve of the salt rock sample at the corresponding temperature, and carrying out inversion to determine model parameters in the total creep strain expression. The invention also provides a long-term deformation prediction method of the salt-cavern underground gas storage cavern structure.

The application discloses a fuel rod cladding rupture failure modeling calculation method, system, equipment and medium. The material of the cladding is Zr-4, and the method comprises the following steps: determining initial conditions, inputting fuel rod geometric dimensions and corresponding fuel, cladding material properties and boundary conditions; calculating the temperature distribution of fuel and cladding at each time based on the physical properties of fuel, cladding and the gap between fuel and cladding; calculating the thickness and mass of the oxidation layer, calculating the volume fraction of Zr-4 converted from alpha phase to beta phase through a crystal phase change model; calculating the high-temperature creep strain rate of the cladding through a high-temperature creep model, calculating the hoop creep strain of the cladding and the hoop stress of the cladding, and updating the gas volume in the cladding and calculating the gas pressure; based on the high-temperature creep strain rate of the cladding, calculating the hoop creep strain of the cladding or the hoop stress of the cladding, evaluating whether the cladding ruptures through a cladding rupture failure criterion and obtaining the rupture time. The application can accurately determine the time of cladding rupture.

The application discloses a kind of high-temperature bolt creep deformation measurement methods, simply summarized, including the following steps: step 1) correction is carried out to measuring micrometer;Step 2) the initial length of high-temperature bolt before operation ( L 初 ) is measured; Step 3) the original length of high-temperature bolt when converting to 0 ℃ ( L 初1 );Step 4) the length of high-temperature bolt after operation ( L 运 ) is measured;Step 5) the length of high-temperature bolt after operation when converting to 0 ℃ ( L 运h );Step 6) the absolute creep deformation amount (△L) of high-temperature bolt is calculated;Step 7) the relative creep strain (ε) of high-temperature bolt is obtained.The creep measuring point of high-temperature bolt is simple and reasonable to install, and measurement error is not easy to produce.The measurement operation is simple, fast, and the measurement result is high in precision and small in error, the creep deformation of high-temperature bolt can be accurately measured by micrometer, which is convenient for industry promotion and conducive to the development of high-temperature bolt creep supervision work.

This invention discloses a method for constructing a fractional-order creep damage constitutive model, relating to the field of geotechnical engineering technology. The method includes: conducting creep tests on a geogrid under different types of soil constraint stress to obtain creep curves; calculating the creep strain of the geogrid at different time points based on the creep curves and plotting the curve of the geogrid's creep strain versus time; introducing the Khachanov damage variable according to the creep damage law to determine the damage variables during the geogrid creep process; constructing an initial fractional-order creep damage constitutive model based on the damage variables, and determining the parameters of the initial fractional-order creep damage constitutive model through the curve of the geogrid's creep strain versus time, thus obtaining the fractional-order creep damage constitutive model. The fractional-order creep damage constitutive model constructed by this invention can accurately reflect the variation law of the geogrid at different creep stages.

This invention discloses a high-temperature creep-resistant die-cast magnesium alloy material with the following mass percentages: Al 4.0-8.0%, La 0-2.5%, Ce 0-3.5%, Pr 0-1.0%, and Nd 0-1.5%, wherein the total mass percentage of La, Ce, Pr, and Nd is ≤4.0%, and Ca 0.05-1.0%, Sr 0.05-3.0%, Mn 0.2-0.6%, and Si 0.01-0.1%. The ratio of Al content to (RE+Sr+Ca) content is (1-2.5):1, and the ratio of RE content to (Sr+Ca) content is (1-2):1. The balance is Mg and unavoidable impurities. The microstructure is uniformly distributed with a grain size of 10-20 μm, containing Al2La phase, AlMnLa ternary phase, and Al... 11 La3 phase and Al4Sr phase. The preparation method includes the following steps: 1. Calculation of the alloy's thermodynamic properties; 2. Preparation of the alloy melt; 3. Refining and modification of the alloy melt; 4. High-pressure casting of the alloy. The tensile strength is 240-250 MPa; the yield strength is 120-130 MPa; the elongation is 9.5-12.5%; under the conditions of a test temperature of 175℃, an applied stress of 85 MPa, and a test duration of 100 h, the creep strain is less than 0.1%.

This invention discloses a method for evaluating the creep life of high-temperature pipelines based on a physical information neural network. The method includes: obtaining the three-dimensional residual stress distribution of the welded joint region of the high-temperature pipeline based on welding thermo-mechanical coupled finite element simulation or residual stress measurement, and using this as the initial stress field for creep analysis; based on the initial stress field, constructing a stress redistribution model considering service temperature, internal pressure, structural constraints, and material creep effects to obtain the stress field distribution evolving over time; based on the evolved stress field, constructing a physical information neural network model incorporating creep constitutive relations and stress balance constraints to predict the creep strain or creep damage evolution process in key areas of the welded joint, and determining the creep life of the high-temperature pipeline by combining creep failure criteria. This invention can reasonably reflect the relaxation and redistribution behavior of welded residual stress during long-term high-temperature service, thereby improving the reliability of creep life evaluation of high-temperature pipeline welded joints.

The invention discloses a viscoelastic material creep behavior prediction method based on a non-local operator. The method comprises the following steps: acquiring creep test data of a viscoelastic material; the method comprises the following steps of: establishing a Psi-Capto fractional order Burgers model which is formed by connecting a Maxwell unit and a Kelvin-Voigt unit in series; psi-Laplace transformation is adopted to deduce a creep strain expression, a damage evolution theory or a nonlinear viscoelasticity theory is coupled, and kernel functions of a power law type, an exponential type or a logarithmic type and the like are selected according to the characteristics of materials and are fitted with experimental data; identifying model parameters by adopting methods such as a nonlinear least square method; and finally, calculating a fitting precision evaluation index, and predicting the creep behavior of the material. Based on the generalized fractional order derivative theory, the method breaks through the limitation that a kernel function of a traditional fractional order model is fixed, achieves flexible matching of the kernel function and material characteristics, improves prediction precision and applicability, and can be applied to creep property evaluation and life prediction of viscoelastic materials such as asphalt and polymers.

The invention discloses a soft rock foundation bearing capacity evaluation method and device and a site selection method and system. The soft rock foundation bearing capacity evaluation method comprises the steps that soft rock feature data of a soft rock foundation and feature information of nuclear facilities are obtained; determining a first type of creep strain, a second type of creep strain and a third type of creep strain of the soft rock foundation according to the soft rock characteristic data; according to the first type of creep strain, the second type of creep strain and the third type of creep strain, the three-dimensional total creep strain of the soft rock foundation is obtained, and the three-dimensional total creep strain is used for representing the long-term deformation behavior of the soft rock foundation; according to the three-dimensional total creep strain and the characteristic information of the nuclear facility, foundation settlement simulation is conducted on the soft rock foundation, the settlement value of the soft rock foundation changing along with time is obtained, the nuclear facility is built on the soft rock foundation, and the settlement value is used for evaluating the bearing capacity of the soft rock foundation. The accuracy of soft rock foundation bearing capacity evaluation can be improved.

This invention relates to a small punch test apparatus for studying the axial and circumferential creep of nuclear fuel cladding tubes. The apparatus, used to hold a sample of a nuclear fuel cladding tube, includes a lower die, a small punch, and an upper die. The lower die has a punched hole, and the upper die has a guide groove. The sample is located between the upper and lower dies, with the upper die pressing the sample against the lower die. The small punch passes through the guide groove and slides relative to it. The center of the sample is located between the small punch and the punched hole, and the position of the punch matches the movement path of the small punch. This invention also relates to a small punch test method for studying the axial and circumferential creep of nuclear fuel cladding tubes. By designing a small punch test apparatus for holding nuclear fuel cladding tubes, this invention accurately calculates the equivalent creep stress and equivalent creep strain of the nuclear fuel cladding tube, establishes a creep constitutive model, and achieves efficient and convenient research on the axial and circumferential creep behavior of nuclear fuel cladding tubes, belonging to the field of nuclear fuel cladding tube creep testing technology.

The application discloses a method for predicting the fatigue fracture times of wind turbine blade composite materials, comprising the following steps: preparing a plurality of wind turbine blade composite material samples, each sample being prepared with two parallel test samples; taking one parallel test sample of each sample to perform a creep performance test under preset test conditions; taking another parallel test sample of each sample to perform a fatigue performance test; fitting the relationship between the creep strain and the fatigue fracture times; for the wind turbine blade composite material to be tested, performing a creep performance test under the same test conditions to obtain the creep strain, and according to the obtained relationship, obtaining the predicted fatigue fracture times of the wind turbine blade composite material. The method can complete the fatigue performance test and evaluation in a short time, establish a linear correlation model of creep and fatigue, calculate the fatigue fracture data by testing the creep strain data, and experimental results show that the theoretical calculation data is very close to the data obtained by the tensile fatigue performance test.

The invention discloses a high-temperature-resistant creep-resistant die-casting magnesium alloy and a preparation method thereof, and relates to the technical field of non-ferrous metal materials. The high-temperature-resistant creep-resistant die-casting magnesium alloy is prepared from the following components in percentage by mass: 5.1 to 7.4 percent of Al, 0 to 6.5 percent of La, 0 to 6.5 percent of Ce (La + Ce = 4.4 to 6.5 percent), 0.1 to 0.5 percent of Sr, 0.001 to 0.5 percent of Sm, 0.15 to 0.35 percent of Mn, 0.01 to 0.3 percent of Zn, 0.001 to 0.05 percent of Y, 0.001 to 0.05 percent of Nd, 0.001 to 0.05 percent of Gd, 5 to 15 ppm of Be and the balance of Mg and impurity elements. Through alloy regulation and control, the high-temperature-resistant and creep-resistant magnesium alloy which is economical and effectively suitable for die casting is provided, and the creep strain capacity of the magnesium alloy is lower than 0.03% under the creep conditions of 105 DEG C, 60 Mpa and 50 h.

The invention relates to a method, a device, equipment and a medium for identifying creep parameters of a coating material from a base material-coating composite system, and relates to the technical field of composites.The method comprises the steps that initial creep parameters of a base material are determined based on pre-obtained uniaxial tensile creep experiment data; on the basis of predefined constraint conditions, reverse optimization is conducted on the initial creep parameters of the base material, and the creep parameters of the base material are determined; determining a creep stress curve corresponding to the coating material on the basis of the uniaxial tensile creep experiment data and the tension balance conditions and compatibility conditions of the base material and the coating material; determining a creep strain curve and a damage curve corresponding to the coating material based on the creep stress curve and a uniaxial expression of the K-R model; and determining parameters according to the creep stress curve, the creep strain curve and the damage curve to obtain the creep parameters of the coating material. According to the method and the device, the creep parameters of the coating material in the base material-coating composite system can be quickly and accurately determined.

This invention provides a method and system for simulating rock creep processes based on deep learning-based near-field dynamics, involving the interdisciplinary fields of rock mechanics, computational mechanics, and artificial intelligence. The method includes: acquiring parameter information of the target rock to be simulated, including the rock's geometry and physical properties; discretizing the target rock into several material points based on the parameter information to construct a creep damage model; performing time-step iterative simulation of the rock creep process based on the initialized creep damage model, ultimately obtaining the displacement field, stress field, and creep strain distribution of the target rock over time. This invention significantly improves computational efficiency by establishing a neural network mapping from bond geometric variables to force density, replacing the complex iterative calculations in traditional near-field dynamics. Furthermore, by combining the creep damage model with damage evolution criteria, it achieves high-precision simulation of the entire creep process of fractured rock masses.

The application discloses a rock creep constitutive model construction and application method, device, equipment and medium, relates to the rock mechanics numerical simulation technical field, and the method comprises the steps of taking the CVISC model as a basic framework; driving the creep damage coefficient and the viscosity coefficient to evolve in time through the rock failure time and the damage process correlation coefficient, constructing a creep damage mechanism, and introducing the creep damage mechanism into the basic framework; controlling the rock elastic modulus and the viscosity coefficient reduction driving creep strain increment increase through the water content, constructing a water damage unit, and introducing the water damage unit into the basic framework; determining the water influence range according to the geometric characteristics of the rock internal defects and generating a non-uniform water content field, coupling the non-uniform water content field to the water damage unit as an input parameter; and numerically simulating the nonlinear creep damage evolution process of the rock. The application can improve the prediction ability of the long-term deformation and damage process of the rock.

The invention relates to a geotechnical material creep practical constitutive model construction method based on spatial curved surface polynomial fitting, and the method comprises the steps: carrying out the polynomial fitting of a change relation between final creep volume strain and final creep shear strain along with a stress state, and obtaining an expression equation of the final creep volume strain and the final creep shear strain about the stress state; the relationship between the final creep strain and the stress state of the geotechnical material can be more accurately captured by improving the order of the expression equations of the two; meanwhile, an index model is adopted to reflect the change of the creep strain along with time, the change rate of the creep strain along with time is controlled by adjusting index parameter values, high flexibility and adaptability are achieved, then the model prediction precision is improved, the engineering applicability is widened, and the method belongs to the technical field of geotechnical engineering constitutive model research.

The invention discloses a concrete early-age self-constriction testing method considering an interface transition area. The method comprises the following steps: solving self-constriction elastic strain of cement paste; obtaining early-age self-constriction creep strain and total self-constriction strain of the cement paste in combination with a time evolution rule of pore pressure caused by hydration reaction; calculating the capillary pressure of the cement paste, the saturation of the cement paste and the bulk modulus of the cement paste; solving the effective elastic modulus of the effective inclusion phase in the concrete system; putting the equivalent inclusion phase into the cement paste to obtain the elastic modulus, Poisson's ratio and bulk modulus of the concrete; the intrinsic strain of the self-constriction of the cement paste is transmitted to the overall dimension of the concrete through a microcosmic homogenization method, and the self-constriction strain of the concrete is obtained. According to the concrete self-shrinkage testing method, the characteristics of an interface transition area are considered, the real early-age deformation behavior is accurately reflected, and the concrete self-shrinkage testing method has engineering applicability and provides a reliable basis for anti-cracking design and durability improvement of high-performance concrete.

The invention provides a high-entropy alloy creep performance prediction method based on microstructure dynamic evolution, and belongs to the technical field of alloy material performance prediction. In order to solve the problems that an existing method excessively depends on an empirical formula, and macroscopic performance is separated from a micromechanism, a multi-physics field coupling dynamics calculation framework is constructed. The framework integrates dislocation dynamics, vacancy diffusion and a non-uniform lattice strain theory, and dynamic interaction and co-evolution of dislocation, vacancy and lattice strain are described in a self-consistent manner. Dislocation evolution, vacancy diffusion and interaction between the dislocation evolution, the vacancy diffusion and lattice strain are synchronously solved in each time step, and real-time bidirectional coupling of the dislocation evolution, the vacancy diffusion and the lattice strain is achieved. Experimental verification shows that the method can accurately predict the creep property of the high-entropy alloy and directly generate a creep strain-time curve. According to the method, microstructure evolution in the creep process can be quantified from intrinsic parameters and service conditions of materials, and an efficient theoretical tool and a calculation platform are provided for creep resistance design of the high-entropy alloy.

The invention discloses a pipeline creep monitoring method and device, a storage medium and electronic equipment, and the method comprises the steps: collecting parameters, images and temperature data of a to-be-monitored component, enabling the images of the to-be-monitored component to comprise an original image and a creep image, and marking a timestamp for the images of the to-be-monitored component; calculating total strain according to the original image and the creep image, calculating elastic stress according to part of parameters of the to-be-monitored component, calculating fatigue stress according to the temperature and part of the parameters of the to-be-monitored component, and calculating fatigue strain and elastic strain respectively according to the fatigue stress, the elastic stress and the elastic modulus; calculating creep strain according to the total strain, the fatigue strain and the elastic strain; a creep limit value database is set according to equipment operation requirements, the set creep limit value database comprises temperature, operation time and a creep limit value, the creep strain calculated in real time is compared with the corresponding creep limit value, if the creep strain is smaller than the creep limit value, no risk exists, and if the creep strain is larger than the creep limit value, a maintenance alarm is sent.

The application discloses a kind of metal material creep performance intermittent loading sensitivity fast test method, comprising: selecting to be tested creep sample, carries out sustained loading creep test, and the cumulative creep time of this sustained loading is not less than a set time or not more than a set time range;Keep creep stress unchanged, change sustained loading creep into intermittent loading creep mode, and the cumulative creep time of this intermittent loading is not less than a set time or not more than a set time range;Obtain creep strain-creep time data under different loading conditions, and draw creep strain-creep time curve.According to creep strain-creep time curve, judge the creep performance intermittent loading sensitivity of material under or in the range of intermittent time of to-be-tested creep stress and intermittent time.The application eliminates the test error caused by sample difference, solves the problems of low efficiency and subjective judgment of existing test, realizes the fast, accurate and objective material creep performance intermittent loading sensitivity evaluation.

The invention discloses a method for predicting the high-temperature creep behavior of a rusted high-strength steel wire, and belongs to the technical field of bridge cable safety assessment. The method comprises the following steps: firstly, obtaining intrinsic material parameters of a rusted high-strength steel wire test piece and an unrusted high-strength steel wire test piece through a test; then, the corrosion morphology is quantified through three-dimensional scanning, the maximum corrosion pit depth of the surface of the corroded high-strength steel wire and the corrosion pit root radius of the pit bottom are extracted, then a stress concentration coefficient and an effective bearing area attenuation function after net section loss are calculated, and a corrosion damage index is introduced; on the basis, a creep strain rate prediction model comprehensively considering local stress concentration, section loss and material damage is established. According to the prediction method, quantitative prediction from the microstructure of the corrosion pit to the macroscopic creep behavior is realized, and the prediction method has great engineering application value for evaluating the safety and the residual life of the in-service bridge cable.

The application provides a dynamic multi-fidelity processing method and product for predicting a high-temperature alloy creep curve, a model library containing a low-fidelity model, a medium-fidelity model and a high-fidelity model is constructed, different precision models in the model library are dynamically called according to a region where the high-temperature alloy is located and a creep strain rate, and thus the goal of 'global high efficiency + local high precision' is achieved, the calculation resource demand is reduced, the calculation efficiency is improved, and meanwhile, the precision of the simulation result is ensured. On this basis, the application also aims at the possible 'breakage' or'mutation' of the creep curve in the model calling and switching process, dynamically solves and optimizes the method, controls the global error, and realizes the continuity of the data output.

The invention discloses a method for predicting a steady-state creep curve of clay under freeze-thaw-dry-wet cycle, which comprises the following steps: respectively carrying out creep tests on clay samples subjected to different freeze-thaw-dry-wet cycle times N to obtain a soil creep strain-time curve; establishing a creep model; fitting the measured creep strain-time curve to obtain model parameters respectively; respectively establishing quantitative relations between the model parameters and N; and establishing a prediction model of the steady-state creep curve of the clay after N times of freeze-thaw-dry-wet cycle effects. According to the method, creep model parameters and freeze-thaw-dry-wet cycle times are fitted through an exponential function with a simple form, and the established prediction model of the steady-state creep curve of the clay after the freeze-thaw-dry-wet cycle can continuously describe the change of creep characteristics along with the freeze-thaw-dry-wet cycle; the creep quantity of the clay under any freezing and thawing-wetting and drying cycle times can be reasonably predicted, and the creep behavior of the clay under the environmental action can be more truly and accurately described.