14 results about "Creep rate" patented technology

The invention relates to the technical field of rock mechanics and underground engineering, in particular to an anchored jointed rock mass multi-field coupling creep characteristic analysis method which comprises the following steps: preparing anchored rock mass samples which are corroded by inorganic salt and contain different joint occurrences, and installing different pre-stressed anchor rods. And carrying out a graded loading creep compression experiment, and synchronously collecting axial deformation and acoustic emission signals. And drawing a creep time-history curve based on deformation data, and determining long-term strength and a creep stage by adopting a steady-state creep rate method. And calibrating the crack initiation and expansion process of the crack at each stage of creep deformation by using an acoustic emission signal. And analyzing response differences between crack development and anchoring failure under different inorganic salt components, concentrations, joint occurrence and prestressing forces, and determining the influence degree of each factor on the anchor rod support effect in each creep deformation stage. According to the method, synchronous quantitative analysis of macroscopic creep characteristics and microscopic damage evolution is realized by coupling chemical corrosion and prestress action, and the accuracy of long-term strength prediction and anchoring failure mechanism understanding is improved.

This invention provides a method, system, and storage medium for determining the blasting time interval in open-pit mines. The method includes: determining the disturbance frequency that has the greatest impact on pore water pressure in soil and rock mass based on field monitoring and laboratory experiments, simulating extreme and dangerous working conditions; dynamically disturbing the sample based on this frequency, judging the consolidation state according to the pore pressure dissipation and creep rate after disturbance, and recording the stable consolidation time T when the conditions are met, obtaining time series at different blast center distances; performing a secondary disturbance after time T, quantitatively evaluating the consolidation effect based on the changes in peak pore pressure and permeability coefficient before and after the secondary disturbance; judging and correcting time T based on the evaluation results, and finally determining the safe time interval for macroscopic blasting operations. This invention can simultaneously consider pore pressure dissipation and soil skeleton deformation, accurately identify the consolidation state and structural damage of soil and rock mass, and provide a scientific and safe basis for time interval decision-making for high-frequency blasting operations in open-pit mines.

This invention discloses a long-term prediction method for deep-sea creep based on in-situ pore pressure observation using Bayesian-LSTM, relating to the fields of sediment dynamics and marine engineering. The method includes: deploying pore pressure sensors to collect pore water pressure data in real time, performing standardization processing, and calculating the pore pressure change rate; constructing a creep rate calculation model based on the effective stress principle and power law; building a time-series feature dataset using sliding window technology, constructing and training a Bayesian-LSTM network model, and introducing a Monte Carlo Dropout layer to assess prediction uncertainty; outputting a high-precision creep rate using a multiple sampling averaging strategy; calculating the cumulative creep distance through numerical integration, and constructing confidence intervals to achieve medium- and long-term trend prediction and risk analysis. This invention integrates physical mechanisms and data-driven approaches, effectively handling data noise and prediction uncertainty in the complex environment of the deep sea, significantly improving the accuracy and reliability of long-term creep prediction, and providing a scientific basis for deep-sea engineering safety assessment.

The application provides a relaxation and creep performance correlation method, and belongs to the field of new materials and is used for developing new materials by testing related activities. First, a high-temperature relaxation test is carried out to obtain corresponding data of temperature-stress-creep relaxation rate. Second, a high-temperature creep test is carried out to obtain minimum creep rate data. Finally, the third step is data processing, and a correlation model is constructed. The application aims at the shortcomings of long data obtaining time and large sample consumption of existing creep performance data, and proposes to use the characteristics of short stress relaxation test, i.e., more creep information and less sample consumption, to quickly obtain a large amount of stress relaxation performance data, and then combine the correlation method shown in the application to quickly and massively obtain the creep performance, so that the service performance can be evaluated.

The present application relates to the technical field of composite materials, and particularly relates to a composite material product containing a hollow channel, a forming method thereof and a mold. The forming method is to reserve the position of the hollow channel through an occupying strip in a layering process, then to solidify the layer containing the occupying strip through mold forming or autoclave process, and then to pull out the occupying strip from the formed product. The occupying strip material has the characteristics of high creep rate, high strength and low friction coefficient, so that it deforms or displaces itself when pulled out, and then the interface debonding with the composite material is realized to form a hollow channel in the product. Compared with the existing technology of forming through pre-embedded pipeline, the influence of the thermal expansion coefficients of different materials is avoided, the composite product rejection rate is reduced, the process steps are reduced, and the production efficiency of the product is improved. The composite material product containing a hollow channel has no pre-embedded pipeline. The forming mold can form the composite material product containing a hollow channel without pre-embedded pipeline.

The application provides a plain area hidden active fault normal fault creep induced surface deformation prediction method, device, equipment and storage medium, relates to the hidden fault activity technical field. The method comprises the following steps: based on the three-dimensional simplified geological model of the hidden normal fault and its adjacent area; taking the fault creep rate as the displacement boundary condition, simulating the surface vertical deformation induced by the hidden normal fault normal fault creep, obtaining the surface vertical deformation characteristics and dividing the surface deformation zone from the hidden normal fault; according to the action law of fault dip angle, creep time and creep rate on the spatial distribution of surface vertical deformation, fitting and constructing the prediction model of normal fault creep induced surface vertical deformation. The application proposes a multi-parameter prediction model covering fault dip angle, creep rate and creep time, and realizes disaster prediction caused by creep activity of hidden fault in plain area.

The invention belongs to the technical field of material mechanical property test and pressure vessel safety inspection, and particularly relates to an experimental device and method for a weld creep test of an all-welded plate heat exchanger. The problems that a traditional uniaxial creep testing machine cannot reproduce the real thermal-mechanical coupling service condition of a heat exchanger, a test object is disjointed with an actual structure, and the data supporting capacity is insufficient are solved. The device comprises an all-welded plate heat exchanger test piece, a pressure supply system, a temperature control system, a high-precision strain gauge arranged on a key welding seam and a multi-channel data acquisition system, the test method is implemented step by step through test piece preparation and installation, sensor calibration, temperature field establishment, pressure application, creep data acquisition and safe unloading. According to the method, the actual service condition of the heat exchanger welding seam can be accurately reproduced, the creep damage evolution law of the welding seam can be captured, key parameters such as the steady-state creep rate can be obtained, and reliable experimental basis is provided for all-welded plate heat exchanger welding seam life evaluation, welding process optimization and in-service safety inspection.

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 subway train slip prevention method based on longitudinal load, comprising the following steps: S1, grouping the train and distributing brake force; S2, setting a creep rate threshold, and judging the current train wheel rail state according to the creep rate; S3, in the case that the creep rate is less than the creep rate threshold, judging the current train wheel rail state through longitudinal load; and S4, implementing corresponding brake force according to the current train wheel rail state. The application can obtain the maximum track friction force in real time and accurately, and avoid train slip in advance, thereby improving subway operation efficiency.

The embodiment of the invention provides a steady-state creep rate prediction method, equipment and a medium, and the method comprises the steps: obtaining an image of a to-be-tested piece sample, and calculating the MX phase volume fraction of the to-be-tested piece sample according to the image of the to-be-tested piece sample, the to-be-tested piece sample is made of 9-12% Cr martensitic steel; based on a formula, the steady-state creep rate of the to-be-tested piece at the temperature of 605 DEG C is determined, v is the MX phase volume fraction of a sample of the to-be-tested piece, the unit of v is%, the unit of v is h-1, and the stress application range of the formula is 99-150 MPa. According to the method, the quantitative relation between the MX phase volume fraction and the steady-state creep rate is defined, and accurate prediction of the steady-state creep rate based on the MX phase volume fraction is achieved.

This invention relates to a remote video monitoring stability analysis system and method for slopes. The method includes the following steps: S1: Constructing a three-dimensional unsteady viscoelastic-plastic shear creep model and acquiring slope stability data under rainfall; S2: Calculating the shear creep rate on the landslide body, defining the main slip line and the sliding section, and determining the blocking section; S3: Determining the nonlinear mapping relationship between the slope surface displacement or crack width and the shear creep rate at the corresponding blocking section; S4: Setting up sensors and targets based on the main slip line; S5: Acquiring the displacement or crack width of the targets; S6: Outputting to a remote computer; S7: Obtaining the shear creep rate at the blocking section corresponding to the targets; S8: Judging the slope stability based on the shear creep rate at the blocking section corresponding to the targets. Compared with the prior art, this invention has the advantages of realizing dynamic evaluation of soil landslide stability and improving the accuracy of instability prediction.

The present application relates to the technical field of multi-element precious metal-based high-temperature alloy, and discloses a multi-element precious metal-based high-temperature alloy steady-state creep rate prediction method based on multi-scale integrated calculation, which comprises the following steps: S1: crystal structures of the multi-element precious metal-based high-temperature alloy and intermetallic compounds are respectively constructed to obtain thermal physical properties of lattice constants, shear moduli, Poisson's ratios, stacking fault energies, diffusion activation energies and diffusion pre-exponential factors; S2: according to the CALPHAD method, the composition-dependent elastic moduli, stacking fault energies and lattice constant thermal physical properties of the multi-element precious metal-based high-temperature alloy are calculated; S3: the thermal physical properties of the multi-element precious metal-based high-temperature alloy single-phase fixed component in S1 and the composition-dependent thermal physical properties in S2 are respectively substituted into a steady-state creep rate model to respectively predict the steady-state creep rates of the multi-element precious metal-based high-temperature alloy changing with temperature and changing with composition. The present application can shorten the research and development cycle of the alloy and reduce experimental costs.

The invention relates to the technical field of dry quenching processes, and particularly discloses a dry quenching chamber outlet arch pre-assembly method for dry quenching, which adopts a mullite brick layer and staggered slab brick layer composite masonry process, and specifically comprises the following steps: S1, pre-assembly early-stage preparation and reference calibration; s2, reference masonry of a bottom mullite brick layer; S3, composite masonry and occlusion positioning of a slab staggering brick layer; s4, carrying out layered prepressing and defect detection; and S5, integrally fixing and transferring the identification. The pre-assembled arch body is remarkable in comprehensive performance, high in compressive strength at the temperature of 25 DEG C and high temperature, high in thermal shock resistance and low in high-temperature creep rate, preheating treatment of mullite bricks, a staggered slab brick concave-convex meshing structure and reasonable staggered joint arrangement are adopted, and a layered progressive increase pre-pressing mode from arch feet to an arch crown is matched, so that the attaching compactness and the structural stability of the brick body are improved. The arch body prepared by the method is high in high-temperature resistance, deformation resistance and thermal shock resistance, and can adapt to harsh working conditions of the dry quenching chamber, and the service life of the arch body is prolonged.

The invention relates to the technical field of constructional engineering, and discloses a brick mould optimization method and system, and the method comprises the steps: obtaining the back active soil pressure, pore water pressure, construction additional load, lateral accumulated displacement, material performance parameters, system temperature change and environment vibration acceleration of a brick mould in real time; sequentially calculating a comprehensive load coefficient, a displacement state coefficient, a material performance coefficient and a model-actually measured displacement matching degree based on the multi-source data; and finally, dynamically calculating the real-time axial force of the target support point in combination with the creep rate and the reference axial force, and adaptively adjusting the current axial force to a target value. The system correspondingly comprises a comprehensive load evaluation module, a displacement state evaluation module, a material performance evaluation module, a model-actual measurement displacement matching evaluation module and an axial force self-adaptive adjustment module. According to the method, the brick blank film support is converted from static design to dynamic sensing and active control, and the construction safety and economical efficiency are remarkably improved.