9 results about "Effective strain" patented technology

The invention relates to the technical field of oil field drilling engineering, in particular to a while-drilling measurement-based rotary guide system risk identification method and identification terminal, and the method comprises the steps: obtaining while-drilling measurement data; establishing a deep well wall surrounding rock stress-strain model, and constructing a well wall stability discrimination equation; establishing a random nonlinear disturbance force action model, and determining random dynamic response process parameters of the system with the rotary guide drill column under the deep well condition; determining the well wall stability according to the well wall stability discrimination equation, and determining the failure risk of the drill column system with the rotation guide according to the random dynamic response process; according to the method, effective strain and effective stress at the position, r away from a borehole, of a near-well-wall zone are calculated, and a well wall stability judgment equation is obtained through fitting to judge the possibility of well wall instability; and a Newmark method is adopted to carry out time discretization on the stochastic nonlinear dynamic model of the drill string system to invert the stochastic dynamic response process of the stochastic nonlinear dynamic model, and risk factors are clarified.

The present invention provides a method for characterizing the deformation characteristics of a TiN alloy, relating to the technical field of titanium alloy material processing and preparation. The present invention proposes a deformation damage constitutive equation applicable to TiN alloys. This equation establishes a functional relationship between damage variables and strain, and uses damage variables to characterize the stress-strain relationship during the deformation of the TiN alloy. This method can more realistically reflect the deformation characteristics of the TiN alloy and predict the effective strain range and fracture stress of the TiN alloy within a certain range of deformation conditions. The damage constitutive equation adopted by the present invention is superior to the traditional Zener-Hollomon parameter equation and can more accurately and specifically characterize the deformation characteristics of the TiN alloy.

A sclera biomechanical evaluation and myopia risk prediction method based on artificial intelligence comprises the following steps: acquiring a plurality of groups of sample data through an OCTB scanning mode, and performing Gaussian smoothing denoising; based on an Otsu threshold segmentation algorithm, carrying out segmentation extraction on a fundus tissue ROI region; stacking and weighting the segmented two-dimensional images to build a three-dimensional alum model surface model; generating a displacement field u by using an image registration technology; calculating a strain tensor E based on the deformation gradient tensor F; calculating an effective strain belonging to eff based on the characteristic value lambda i of the strain; constructing a deformation field prediction model; a baseline image is obtained, a deformation field prediction model is used for prediction, and a fundus deformation field phi is obtained; quantifying the deformation percentage; constructing a compliance classification prediction model; and performing prediction based on the deformation field phi by using the compliance classification prediction model, and outputting a binary classification compliance prediction result, namely high compliance or low compliance. According to the method, accurate quantification and pathological risk prediction of the posterior sclera deformation of the eye can be realized.

The application discloses a method for predicting and evaluating the overall formability and local formability of high-strength steel. u The uniaxial tensile test is carried out, and the strain is uniformly distributed before the material reaches the tensile strength or necking instability, which reflects the overall formability of the material. The effective strain range with the necking as the center is about 20 mm, the thickness-based fracture strain of a sample with a complete fracture is determined as the evaluation index of the local formability. The method can well predict and evaluate the overall formability and local formability of advanced high-strength steel, and has the advantages of simple operation, reliable result, wide application range and low cost.

The invention discloses a low-cycle fatigue life prediction method and system suitable for a directional solidification turbine blade, and relates to the technical field of gas turbine key component life determination, and the method comprises the steps: obtaining to-be-measured data of the directional solidification turbine blade; the data to be measured comprises elastic modulus and low-cycle fatigue performance data; calculating an orientation factor based on the elastic modulus; determining effective strain energy density based on the low-cycle fatigue performance data; and calculating the predicted low-cycle fatigue life of the directionally solidified turbine blade based on the orientation factor and the effective strain energy density. The method can improve the prediction precision of the low-cycle fatigue life of the directional solidification turbine blade.

The invention relates to the technical field of titanium alloy material processing, in particular to a regulation and control method for improving consistency of high-temperature fatigue performance of a titanium alloy forging stock based on effective strain, and the method comprises the following steps: 1) preparing a titanium alloy bar or a cake-shaped forging stock meeting requirements; (2) a finite element simulation technology is adopted, and a single-heating-number or multi-heating-number thermal deformation process is drawn up with the optimization targets that the cumulative effective strain of the core of the forging stock in the diameter direction and the volume fraction of a difficult-to-deform area is smaller than 20%; 3) simulating an optimized thermal deformation process, and performing air cooling after forging; (4) carrying out high-temperature solution treatment, and carrying out water quenching or oil quenching after heat preservation; and 5) carrying out long-time strengthening treatment, and then cooling to room temperature. According to the method, effective strain distribution is quantitatively controlled, a specific heat treatment system is combined, a coarse primary alpha phase is effectively crushed, homogenization of a microscopic structure is achieved, the high-temperature fatigue performance consistency of different positions of the large-size titanium alloy forging stock is remarkably improved, and the method is particularly suitable for blank pretreatment of large disc forgings for aero-engines.

The invention relates to the technical field of strain measurement, in particular to a full-field strain quantitative measurement method based on DIC auxiliary stress luminescence, which comprises the following steps: (1) preparing a stress luminescence film metal test piece; (2) carrying out tensile test and optical acquisition through a measuring system; (3) data extraction and picture processing; (4) establishing a quantitative calibration relationship between the stress luminescence light intensity and the DIC effective strain; finally, the quantitative calibration relation y = 0.25 x + 3.59 of the stress luminescence light intensity and the DIC effective strain is obtained, x represents light intensity data, y represents strain data, a quantitative strain visualization cloud picture of the test piece is drawn, and quantitative full-field strain measurement based on DIC auxiliary stress luminescence can be achieved. According to the method, stress luminescence detection and DIC strain measurement have good compatibility in the aspect of data acquisition and processing, and direct conversion from a stress luminescence intensity field to a physical strain field is realized, so that the method can be popularized and applied to quantitative analysis of mechanical response characteristics of various stress luminescence material systems.

A numerical simulation analysis method for the swelling and bursting of pressurized water reactor fuel rod cladding, relating to the field of reactor safety analysis technology, includes: obtaining constant parameters of the fuel rod cladding; establishing and meshing a geometric model; assigning physical property values ​​to each element mesh; calculating the temperature distribution of the fuel rod cladding and determining whether a phase transition has occurred; if a phase transition has occurred, calculating the phase transition process of the cladding material; if the phase transition is complete or has not occurred, calculating the creep and plastic behavior of the cladding material; updating the effective stress and effective strain rate of the cladding material, and then calculating the yield stress of each element mesh; determining whether both the effective strain rate and yield stress have reached the corresponding failure thresholds; if neither has reached the threshold, repeating the calculation; if either reaches the failure threshold, performing a dynamic bursting process calculation of the cladding until the pressure inside and outside the cladding is balanced, and simulating the dynamic bursting process of the cladding; this method addresses the limitations and inaccurate results of traditional bursting analysis.

The present invention relates to the field of construction, and specifically to a numerical calculation method for the compressive bearing and deformation of high-strength reinforced concrete columns, comprising the following steps: S1, continuously changing the strain values of the high-strength steel bar eccentrically compressed column away from the axial force side and the adjacent axial force side, wherein each strain away from the axial force side and the strain adjacent to the axial force side constitute a set of strain pairs; S2, inversely calculating the axial force, bending moment, and curvature of the column cross section under the corresponding state based on the strain pairs; S3, screening effective strain pairs, and optimizing the remaining strain pair data as a data set; S4, calculating the ultimate bearing capacity or lateral deformation displacement of the column under different states based on the data set. The present invention provides an accurate and efficient calculation method for calculating the ultimate bearing capacity and lateral deformation displacement of a high-strength steel bar eccentrically compressed column.