5 results about "Creep stress" patented technology

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.

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 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.

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.