30 results about "Creep stress" patented technology

The invention relates to a method, a system and equipment for predicting creep stress at a joint of a concrete structure and a medium. The method comprises the following steps: testing a concrete structure material and a concrete structure joint filling material, and constructing a joint material performance database based on test data; constructing a multi-scale mechanical model comprising a macrostructure model and a microcosmic interface model based on the seam material performance database; constructing an interface constitutive relationship based on the seam material performance database and the multi-scale mechanical model; and predicting the creep stress at the joint of the concrete structure based on the material performance database at the joint, the multi-scale mechanical model and the interface constitutive relationship. The method can fully consider the sudden change of the performance of the material at the joint and the interface effect, provides reliable technical support for the safety evaluation and maintenance of the concrete structure, and is particularly suitable for engineering application of large-span and high-rise buildings and the like with higher requirements on the long-term performance of the structure.

The invention discloses a method for predicting creep-fatigue interactive damage of a powder disc edge. The method comprises the following steps: S1, constructing a creep constitutive model of the powder disc edge; s2, acquiring load holding time; s3, creep stress analysis and creep fatigue weak position acquisition; s4, creep stress segmentation: establishing a creep stress relaxation model in which the stress sigma is related to the time t, and segmenting the creep stress by taking the logarithmic stress as the step length; s5, performing low-cycle fatigue damage analysis, and acquiring the low-cycle fatigue life and the low-cycle fatigue accumulated damage of the section by adopting a stress-life curve or a strain-life curve; s6, creep-stress fracture damage and total damage are analyzed, and creep-stress fracture accumulated damage and low cycle fatigue and creep-stress fracture total damage under corresponding cycles are obtained; s7, designing and verifying a powder disc edge simulation piece; and S8, verifying and improving a powder disc edge creep-fatigue damage prediction model. According to the method, the creep-fatigue prediction precision of the turbine disc edge is improved.

The application discloses a method and system for rapidly predicting a creep stress index of a tin-based solder alloy by integrating a model, collects element compositions, test temperatures and creep stress index values of the tin-based solder alloy from literature, and adds experimental data as dataset samples; the element compositions and test temperatures of the tin-based solder alloy are sorted out and used as features for modeling; the dataset is randomly divided into a training set and a test set in a 4:1 ratio; the collected creep stress index values of the tin-based solder alloy are used as target variables, and the features are used as independent variables; based on the divided training set, the independent variables are scaled by using RobustScaler, three learners are trained and integrated to obtain an R-X-L integrated model; and the R-X-L integrated model is used to rapidly predict the creep stress index of the test set samples and four independent experimental samples. The prediction model for the creep stress index of the tin-based solder alloy is simple, fast, low-cost, pollution-free and the like based on reliable literature data and a modeling method.

This invention relates to the field of dynamic load section stress monitoring and feedforward adaptive intelligent correction technology for coal conveyor belts in thermal power plants. The invention provides an automatic monitoring and correction device for coal conveyor belts, comprising: a control host that extracts speckle decorrelation index and maps the transverse segregation gradient matrix through a data acquisition and detection module; a rheological state analysis module that introduces a fractional-order calculus dynamics model to analyze the creep stress field and outputs a deformation potential energy time series; a spatial feature prediction module that uses the Koopman operator to elevate the nonlinear system to a linear functional space, identifies outbreak nodes by tracking eigenvalue drift trajectories, and issues early warning commands; and an acoustic field adhesion breaking correction module that drives piezoelectric ceramic elements to construct a local acoustic radiation standing wave field, breaking van der Waals forces to release transverse shear potential energy. This invention solves the risk of belt misalignment and tearing caused by material segregation and adhesion under multi-coal blending conditions.

The present application relates to the technical fields of high temperature creep test, in particular to a method for obtaining high temperature creep parameters of iron-nickel based alloy, which mainly determines the creep strain model of iron-nickel based alloy, obtains the creep strain rate calculation formula from the creep strain model, implements two creep tests of target test material under two different creep stresses at target temperature, respectively obtains the creep curves corresponding to creep time and creep strain, selects two creep times at the first stage and the second stage of the two creep curves respectively, obtains the creep strain and creep strain rate under the creep stress corresponding to the two creep times respectively, substitutes into the creep strain model and the creep strain rate calculation formula, and calculates the variable parameters of the creep strain model. The evaluation process of the creep model is greatly simplified, the required number of creep tests and test time are reduced, and the test cost is reduced.

This application belongs to the technical field of creep prediction, and specifically discloses a method and device for predicting long-term creep data based on short-term creep data. The method includes: obtaining steady-state creep rate data of a material at different stress levels through a multi-level stress step loading method based on the short-term creep data obtained from short-term creep tests; determining the first fitting parameter value of the creep deformation performance model through non-linear fitting; determining the creep stress exponent at different stress levels based on the steady-state creep rate data and creep stress; determining the creep damage parameter at different stress levels based on the creep stress exponent and the creep damage parameter model; determining the second fitting parameter value of the creep deformation prediction model through non-linear fitting to predict the long-term creep deformation of the material; and determining the third fitting parameter value of the creep life prediction model based on the second fitting parameter value to predict the long-term creep life of the material. This application realizes the prediction of long-term creep performance based on short-term creep data.

A method for monitoring the temperature difference between upper and lower layers of mass concrete that is easy to implement, belonging to the field of concrete construction monitoring, includes: simulating and calculating the temperature field and creep stress field of mass concrete under different construction conditions; designing different calculation methods for the temperature difference between upper and lower layers to obtain samples of the maximum temperature difference and maximum tensile stress between upper and lower layers of concrete under different calculation methods; determining the failure probability of the maximum tensile stress between upper and lower layers of concrete under different calculation methods based on the allowable tensile stress of concrete; obtaining the allowable temperature difference between upper and lower layers of mass concrete by combining the determined failure probability feedback; selecting a calculation method that is easy to calculate and on-site monitoring and the corresponding allowable temperature difference between upper and lower layers of concrete for temperature control and crack prevention of mass concrete. This method addresses the problems that the existing definition of the temperature difference between upper and lower layers is not convenient for monitoring and the control range of the allowable temperature difference between upper and lower layers is not representative. Based on the principle of matching the calculation method and monitoring index, it gives a calculation method for the allowable temperature difference between upper and lower layers under the corresponding monitoring method.

Provided are a high-strength and low-creep overflow brick and a design method therefor, which belong to the technical field of glass substrate manufacturing. A mature overflow brick for glass substrate manufacturing is used as a reference overflow brick, and design parameters of the reference overflow brick, design parameters of a target design overflow brick, and an overflow brick creep stress exponent are acquired; similarity relationships between the reference overflow brick and the design overflow brick are established, and a system of equations regarding a first height and a second height of an inlet cross-section of the design overflow brick is constructed; the similarity relationships and known parameters are utilized to obtain equivalent thicknesses, equivalent height base values and equivalent heights of the reference overflow brick and the design overflow brick; and then, on the basis of the known parameters, the support surface length and clamping cylinder maximum cylinder pressure of the design overflow brick are obtained, thereby completing the design of the high-strength and low-creep overflow brick.

Several embodiments of the present description relate to a high-strength, creep-resistant overflow tile and a method for its design, which belongs to the field of glass substrate manufacturing technology. Using an overflow tile established in glass substrate manufacturing as a reference overflow tile, the design parameters of the reference overflow tile, the design parameters of the target overflow tile, and the creep stress exponent of the overflow tile are determined. A similarity relationship between the reference overflow tile and the target overflow tile is established, and a system of equations is formulated with respect to the first and second heights of the inlet cross-section of the target overflow tile.Using the similarity relationship and known parameters, the equivalent thickness, equivalent base height, and equivalent height of the reference overflow tile and the overflow tile to be designed are determined. Subsequently, the length of the bearing surface of the overflow tile to be designed and the maximum cylinder pressure of the clamping cylinder are calculated using the known parameters, thus completing the design of the high-strength, creep-resistant overflow tile. The application of this design method enables effective optimization with regard to the structural strength of the overflow tile, the clamping cylinder method, and the long-term creep behavior, thereby ensuring the quality stability of the forming guide plate.

This invention provides an experimental method for detecting in-situ creep stress in rock and soil. A side hole is first drilled in the rock and soil at the survey site using a drilling machine. While ensuring the strength of the rock and soil, a pressure sensor is installed in the side hole using a combination of a hollow cylinder and a silicone mold. A computer is connected to record initial data. A main hole is then drilled using the drilling machine. Expansive cement is then filled into the main hole to exert force on the rock and soil. Expansion bolts are placed in the middle of the cement during filling to facilitate removal. Finally, data analysis is performed to draw conclusions. This method is primarily applicable to survey sites of various rock and soil types.

A P92 steel steam pipeline residual life nondestructive evaluation method based on in-situ micron indentation comprises the steps that a portable micron indenter is used for in-situ testing to obtain the indentation elastic modulus and the indentation creep stress index of a P92 steel steam pipeline, and corresponding damage variables are constructed by combining the elastic modulus and the indentation creep stress index of a material when the material leaves a factory; according to the method, damage variables are introduced to correct parameters in a K-R equation, so that multi-damage variable parameter coupling identification of the endurance strength of the material is realized, and the residual life of the material is further estimated based on the endurance strength obtained through identification. According to the method, damage variables are introduced to correct Kachanov-Robatnov (hereinafter referred to as K-R) equation parameters, and nondestructive identification of the endurance strength is realized in combination with a micron indentation technology, so that an accurate and efficient residual life evaluation model suitable for the field is established; the limitation of a traditional method can be effectively overcome, and a nondestructive evaluation technology for the residual life of the in-service pipeline is provided.

The application belongs to the technical field of aluminum alloy materials, and particularly relates to a high-temperature creep-resistant aluminum alloy and a preparation method thereof. The aluminum alloy is composed of the following raw materials in percentage by weight: 0.7-1.4% Mn, 0.2-0.6% Si, 0.05-0.15% Sn, Fe≤0.15%, Ti≤0.1%, and the balance of Al. The preparation method is based on the thermodynamic properties of alloy elements, combined with a heat treatment process for controlling the heating rate, to promote the refinement and uniform precipitation of the alpha-Al(Mn, Fe)Si second phase in the alloy, and mainly form a stable coherent quasicrystal structure. The phase exhibits good thermal stability in a high-temperature environment, can effectively inhibit grain boundary sliding and pin dislocations, significantly improve the creep stress threshold of the material, reduce the creep rate, and thus enhance the high-temperature creep resistance of the alloy.

The invention relates to the technical field of coal mining simulation, in particular to a coal seam roof caving compaction creep unified calculation method and device considering mining induced coal seam roof caving compaction creep The method comprises the steps that a stress field of a caving zone caving rock mass of target roof rock is emptied, caving stress distribution of the caving rock mass is obtained, and therefore the compaction process of the caving zone caving rock mass is simulated; compacting stress distribution meeting the preset compacting condition is generated; and based on a first target calculation unit meeting a preset creep condition in the compaction stress distribution, simulating a creep process of the caving rock mass in the caving zone, generating creep stress distribution, and determining a coupling simulation result of the compaction and creep behaviors of the caving rock mass in the caving zone according to the compaction stress distribution and the creep stress distribution. Therefore, the problems that the mining process, caving zone formation, compaction and creep behavior synergistic effect are difficult to consider at the same time, complex deformation of goaf overlying strata and the earth surface cannot be accurately predicted, and the safety of coal mining is reduced in the prior art are solved.

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 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.

The utility model discloses an outer wall waterproof prefabricated insulation board which comprises a prefabricated insulation layer and an outer side waterproof layer located on the outer side of the prefabricated insulation layer, an embedded connecting piece connected with an outer wall body is embedded in the prefabricated insulation layer, and a creep transition layer is arranged between the outer side waterproof layer and the prefabricated insulation layer. The creep coefficient of the creep transition layer is located between the creep coefficient of the outer waterproof layer and the creep coefficient of the prefabricated heat preservation layer. Therefore, the relative creep between the outer side waterproof layer and the prefabricated thermal insulation layer is transited, the creep of the outer side waterproof layer relative to the creep transition layer is smaller than the original creep, and the creep stress is controlled within a reasonable range, so that the generation of micro-cracks is greatly reduced, and the waterproof effectiveness of the outer wall is ensured; meanwhile, the outer waterproof layer is tightly combined on the outer side of the creep transition layer, falling can be effectively prevented, and safety is ensured.

The invention provides a method for predicting the residual creep life of a nickel-based single crystal superalloy for a gas turbine, and relates to the technical field of gas turbine hot end component materials and application. According to the invention, on the basis of a long-time microstructure database under near service conditions, a macroscopic creep constitutive equation and a machine learning technology are combined to construct the creep stress and strain evaluation and residual life prediction method of the high-temperature alloy for the gas turbine based on the microstructure; finally, the creep stress, strain and residual life of the alloy with the known service time are predicted. According to the method, when the residual creep life is predicted, the microstructure evolution rule in the long-time creep process of the alloy is considered, and the method has higher accuracy and rationality. The method is suitable for engineering application, and has strong engineering application significance in reliability evaluation, blade maintenance and design of the turbine blade material of the heavy-duty gas turbine.

The invention belongs to the technical field of aluminum alloy materials, and particularly relates to a high-temperature-creep-resistant aluminum alloy and a preparation method thereof. The aluminum alloy is composed of, by weight, 0.7%-1.4% of Mn, 0.2%-0.6% of Si, 0.05%-0.15% of Sn, smaller than or equal to 0.15% of Fe, smaller than or equal to 0.1% of Ti and the balance Al. The preparation method is based on thermodynamic characteristics of alloy elements, a heat treatment process for controlling the heating rate is combined, refining and uniform precipitation of a second phase of alpha-Al (Mn, Fe) Si in the alloy are promoted, and a stable coherent quasicrystal structure is mainly formed. The phase shows good thermal stability in a high-temperature environment, grain boundary slippage and pinning dislocation can be effectively inhibited, the creep stress threshold value of the material is remarkably increased, the creep rate is reduced, and therefore the high-temperature creep resistance of the alloy is enhanced.

The invention provides a creep stress relaxation response model parameter calibration method and device based on a deep neural network, and relates to the technical field of computers. According to the method, a creep stress relaxation simulation model is constructed, multiple groups of parameter samples are generated, calculation and parameter fitting are performed on creep stress relaxation response results corresponding to each group of parameter samples, and then a parameter prediction model is trained based on fitting parameters. According to the method, the creep stress relaxation response under the target working condition can be obtained without repeating finite element simulation calculation and parameter fitting processes in the subsequent analysis stage, so that the calculation time and calculation resource consumption are remarkably reduced, and the analysis efficiency is improved; uniform parameter fitting is carried out on creep stress relaxation response results corresponding to multiple groups of parameter samples, and the parameter prediction model is trained based on fitting parameters, so that automatic prediction of the parameters of the creep stress relaxation response model is realized, uncertainty caused by repeated adjustment of the model parameters depending on artificial experience is reduced, and the parameter calibration efficiency is improved.

A method and device for predicting long-term creep data based on short-term creep data. The method comprises: obtaining steady-state creep rate data of a material under different stress levels through a step-loading method for multi-stage stress based on short-term creep data; determining first fitting parameter values of a creep deformation performance model through nonlinear fitting; determining the creep stress exponents under different stress levels based on the steady-state creep rate data and creep stress; determining the creep damage parameters under different stress levels based on the creep stress exponents and a creep damage parameter model; determining the second fitting parameter values of a creep deformation prediction model through nonlinear fitting to predict the long-term creep deformation of the material; and determining the third fitting parameter values of a creep life prediction model based on the second fitting parameter values to predict the long-term creep life of the material.

The present application provides a kind of elastic-viscoelastic-viscoplastic deformation stage rock permeability prediction method, belong to rock permeability prediction technical field;In order to effectively predict the permeability evolution trend of rock in different deformation stages, overcome the deficiencies of prior art, provide a kind of elastic-viscoelastic-viscoplastic deformation stage rock permeability prediction method, the technical scheme for using is as follows: rock triaxial compression experiment is carried out, and the triaxial compressive strength data of rock under different confining pressure level conditions is obtained;Creep stress level is set, rock sample creep-seepage experiment is carried out, and the axial deformation data of rock sample, the gas pressure data of sample gas inlet end and gas outlet end are obtained;The axial load of rock sample is unloaded to hydrostatic pressure state, and the seepage experiment in pressure relief deformation recovery stage is carried out while confining pressure remains unchanged;The present application is applied to the calculation and prediction of rock permeability.

The present invention discloses a method for predicting rock deformation based on full-process elastoplastic creep analysis, comprising the following steps: 1) constructing a plastic strain expression of a plastic element related to a time variable; 2) establishing an aging damage function of a rock during the creep process based on the probability density function of rock damage; 3) substituting the aging damage function into the expression in step 1) and considering the viscosity coefficient of the damaged plastic element to obtain a constitutive equation of the element stress with respect to plastic deformation; 4) constructing a rock creep stress prediction model reflecting the variation of mechanical properties with time t during the whole creep process; 5) using the rock creep stress prediction model to calculate the strain of the rock undergoing creep deformation at a specified prediction time, and predicting the deformation of the rock; The present invention can provide predictive analysis for rock deformation, and its accuracy and feasibility have been verified through the comparative analysis of the actual working condition monitoring and measuring deformation values and the model calculation values.

The invention belongs to the technical field of aero-engines, and particularly relates to a method for calculating creep damage equivalent stress of a turbine blade, which comprises the following steps of: S1, selecting a state with the maximum damage from a plurality of working states of the turbine blade as an equivalent state under the condition of not considering creep stress relaxation; s2, enabling the damage of other working states to be equivalent to the equivalent state, and obtaining the total equivalent time t4 of the equivalent state; and S3, considering creep stress relaxation according to the equivalent state, calculating the life L4 based on the temperature T1 and the equivalent stress sigma 4, and obtaining accumulated damage D4. According to the method, hundreds of life analysis points can be simplified into an equivalent design state, the efficiency of the endurance life analysis process is improved, and the reliability of life design is ensured.

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 belongs to the technical field of corrosion electrochemistry, and particularly relates to a creep thermal stress induced high-temperature corrosion online measurement device and method, and the device comprises a simulated flue gas input module, a creep stress corrosion measurement module, a circulating water module, a high-temperature tube furnace and a tail gas treatment module; the high-temperature tube furnace is respectively connected with a circulating water module, a tail gas treatment module and a simulated flue gas input module, and the creep stress corrosion measurement module comprises a loading part for applying constant stress and an electrochemical corrosion measurement part; compared with the prior art, the online measurement device for the high-temperature corrosion under the induction of the creep thermal stress has the advantages that the failure mechanism of a metal material under multi-factor coupling can be researched; the corrosion rate under thermal-mechanical-electric / chemical coupling is effectively monitored on line in real time through an electrochemical measurement device, and the influence of multiple physical fields on corrosion under peak regulation is explored.

A high-strength low-creep overflow brick and a method for designing the same are provided. The method includes: selecting a mature overflow brick for manufacturing a glass substrate as a reference overflow brick, obtaining design parameters of the reference overflow brick, design parameters of a designed overflow brick, and a creep stress exponent of the overflow brick; establishing similarity relationships between the reference and designed overflow bricks, and establishing a system of equations regarding a first height and a second height at an inlet cross-section of the designed overflow brick; determining strength parameters of the reference and designed overflow bricks based on the similarity relationships, the design parameters of the reference and designed overflow bricks, the system of equations; determining a support surface length of the designed overflow brick and a maximum cylinder pressure of a clamp cylinder based on the strength parameters of the reference and designed overflow bricks.

This invention discloses a rapid testing method for the temperature sensitivity of creep properties of metallic materials, comprising the following steps: selecting a creep specimen and conducting a creep test at a certain temperature to be investigated on a creep testing machine that meets the testing conditions; the creep time is usually not less than a set time; after the creep time is reached, keeping the creep stress constant, adjusting the test temperature to another temperature to be investigated and conducting a creep test, the creep time of which is usually not less than a set time; obtaining creep-time data at different temperatures and plotting creep-time curves; determining the temperature sensitivity of the material's creep properties at the tested creep stress and temperature based on the creep-time curves. This invention proposes a rapid testing method for the temperature sensitivity of creep properties of metallic materials. This method uses only one specimen, eliminating differences between specimens, greatly improving testing efficiency, and saving testing costs.

The application provides a creep stress relaxation response model parameter calibration method and device based on a deep neural network, and relates to the technical field of computers. The method constructs a creep stress relaxation simulation model and generates multiple sets of parameter samples, calculates and parameter fits the creep stress relaxation response results corresponding to each set of parameter samples, and trains a parameter prediction model based on the fitted parameters, so that in the subsequent analysis stage, finite element simulation calculation and parameter fitting processes do not need to be repeatedly performed, the creep stress relaxation response under a target working condition can be obtained, the calculation time and the calculation resource consumption are significantly reduced, and the analysis efficiency is improved; the creep stress relaxation response results corresponding to the multiple sets of parameter samples are uniformly parameter fitted, a parameter prediction model is trained based on the fitted parameters, the automatic prediction of the creep stress relaxation response model parameters is realized, the uncertainty caused by the repeated adjustment of the model parameters depending on artificial experience is reduced, and the parameter calibration efficiency is improved.

The application provides a turbine blade creep stress and low cycle fatigue damage segmented prediction method, comprising the following steps: step one, finite element modeling analysis is performed on the blade according to the structural characteristics of the laminate, film hole and impact hole of the cooled turbine blade; step two, the loading and unloading time of each type of cycle is determined; step three, a creep stress relaxation model is established; step four, creep stress analysis is performed in sequence through short-time loading, short-time unloading, short-time loading, loading and unloading, short-time unloading and unloading; step five, the change law of the peak stress with time and the change law of the valley value stress with time in the valley value stress during the unloading process are fitted respectively; step six, the peak stress during the unloading process and the valley value stress during the unloading process are segmented and segmented cycle stress is obtained; step seven, segmented low cycle fatigue life analysis is performed; step eight, segmented time is obtained according to the change law in step five; and step nine, total damage is calculated.

The application provides a warm-pressing parameter determination method for dry fiber preform thickness control, which comprises the following steps: a single equation form dry fiber preform creep / recovery material model is proposed, creep / recovery experiments are conducted, strain-time curves of test pieces under two test conditions are obtained, model parameter identification is conducted according to the curves, the single equation form dry fiber preform creep / recovery material model after identification is obtained, and finally, the single equation form dry fiber preform creep / recovery material model is used to predict the dry fiber preform thickness under corresponding creep stress and experimental preform temperature. The single equation form dry fiber preform creep / recovery material model established by the application can accurately describe the time-dependent thickness creep / recovery behavior of the dry fiber fabric preform, and the comparison between the model prediction result and the newly designed experimental data shows that the experimental and model prediction curves are basically consistent, thereby proving the effectiveness of the method.