15 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 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.

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.

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 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 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.

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.