8 results about "Stress–strain analysis" patented technology

This invention discloses a device for determining the compressive plasticity stage of recycled concrete based on acoustic emission and stress-strain analysis. The device includes: applying axial compressive loads to recycled concrete specimens under different working conditions, simultaneously measuring their acoustic emission signals and compressive stress-strain curves, and outputting an Excel spreadsheet containing the time, cumulative acoustic emission energy value, acoustic emission b-value, stress, and strain. A GUI interface is constructed using MATLAB, creating execution buttons, input boxes, result display areas, and graphical display areas. Callback functions for file selection and monitoring are defined based on the GUI interface. Acoustic emission, b-value, stress, and strain data are extracted from the specified Excel worksheet and interpolated. Functions are called to detect yield strength and the time and strain of complete failure, and the results are output. This invention can quickly detect the plasticity stage of materials by processing acoustic emission and stress-strain data, making data processing and result display more intuitive.

The invention discloses a method for optimizing the random vibration fatigue life of a laminated welding spot, which comprises the following steps of: establishing a finite element simulation analysis model of the laminated welding spot based on ANSYA software, performing random vibration mode analysis and stress-strain analysis on the model, predicting the fatigue life of the laminated welding spot, determining factors and level values which influence the life of the laminated welding spot, and optimizing the fatigue life of the laminated welding spot. 9 groups of different parameter level combinations are designed by using an orthogonal test method, the vibration fatigue life of the 9 groups of laminated welding spots is predicted, range analysis is carried out, the optimal level combination with the maximum life is obtained, simulation verification is carried out, and the optimization method is simple and obvious in effect, and has certain reference significance for fatigue life optimization of other types of welding spots.

The present application relates to the technical field of building material detection, in particular to a color stone metal tile strength detection method and system, comprising: obtaining surface reflection light distribution data and internal structure stress distribution data of the sample to be detected, analyzing surface coating uniformity and micro-morphology characteristics to generate surface quality evaluation data set; fusing surface data and internal stress data, constructing a comprehensive stress-strain analysis model, and calculating the theoretical deformation parameters and the limit bearing threshold of the sample under the preset load; according to the above calculation results, accurately guiding the loading position, force value and process in the subsequent physical strength detection. The method combines the surface microstate and internal structure information to carry out predictive modeling, realizing the transformation of the detection process from unified loading, post-judgment to predictive guidance and intelligent loading.

The invention belongs to the technical field of structural safety detection, and discloses a concrete box girder bridge section stiffness distribution updating method which comprises the following steps: (1) acquiring strain data required for updating the section stiffness of a box girder; (2) establishing a stress-strain analysis theory; (3) discretizing the cross section of the box girder to establish a numerical model; and (4) updating the rigidity distribution of the cross section of the box girder. Based on the problems that the rigidity distribution of the cross section of the box girder bridge is uneven and the stress-strain distribution of the cross section is complex, a generalized girder theory and a model updating method are used for inverting the rigidity distribution condition in the cross section of the box girder, and the stress-strain in the cross section of the box girder when the rigidity is uneven is accurately calculated. According to the method, a rigidity updating strategy taking the inertia moment and the neutral axis as constraint conditions is applied, the section rigidity distribution can be well updated, and the rigidity updating calculation efficiency is improved. Meanwhile, the method considers the special deformation mode of the cross section of the box girder, obtains the proportion of various deformation modes in the total stress, and is more beneficial to the evaluation of the stress condition.

The invention discloses a stress-strain analysis method for a rib-wound fuel rod under a large temperature gradient, and relates to a nuclear industry technology. The method comprises the following steps: firstly, establishing a geometric model of rib-wound fuel rods, and replacing adjacent rib-wound fuel rods with fixing plates made of the same material; then, based on Ansys Workbench, a table insertion method is adopted to define material physical relations under different temperatures or irradiation conditions, and a contact relation between the cladding and the fixed plate is set; adopting an APDL function to edit cladding surface heat transfer boundary conditions, and setting the same heat transfer boundary and constraint conditions for the fixed plate; and finally, solving the temperature field and stress strain of the rib-wound fuel rod and the fixed plate based on a finite element method. According to the method, the elastoplasticity problem that the rib-wound fuel rod material is influenced by irradiation and high temperature at a large temperature gradient is considered, and the simulation model is reasonably simplified according to the mutual contact characteristic between the rib-wound fuel rods; and on the basis of saving computing resources, deformation and stress distribution of the rib-wound fuel rod in extreme environments such as high temperature and high pressure can be simulated more truly.

The application provides a stress-strain analysis method of an anisotropic material, characterized in that the method comprises the following steps: S1, establishing a geometric model of the anisotropic material, and performing mesh division on the geometric model to obtain an isolated mesh model; S2, processing each mesh unit in the isolated mesh model to obtain a directional vector of each mesh unit; S3, creating a discrete field by using the directional vector of each mesh unit of the isolated mesh model obtained in step S2; and S4, performing material coordinate paving on each mesh unit of the isolated mesh model by using the discrete field.

The present application relates to a dam simulation test platform stability analysis method under the combined action of multiple loads, comprising: modeling the steel cable used for the test platform binding fixation, analyzing the stress-strain of the steel cable; obtaining the stability boundary conditions of the structural members of the dam simulation test platform through analysis; analyzing the stability of the structural members of the test platform under large temperature difference conditions; analyzing the stability of the dam simulation test platform under the action of wind load; analyzing the load of the dam simulation test platform under the impact of sediment flow; analyzing the stress-strain of the dam simulation test platform under the combined load, and judging the stability of the dam simulation test platform. The present application calculates the sediment flow impact, wind load and snow load of the dam simulation test platform, analyzes the stress field and strain distribution of the dam simulation test platform under the combined load, judges the stability of the dam simulation test platform, and ensures the structural safety and stability of the test platform under extreme weather conditions.

The invention provides a 3D printing method and system for an osteochondral stent. The method comprises the following steps: collecting three-dimensional point cloud data of an osteochondral defect part; reconstructing a three-dimensional model of the defect part based on the point cloud data, and performing stress-strain analysis on the model; according to a stress distribution result, establishing a porosity dynamic adjustment model to adjust pore parameters; and generating a printing path based on the target pore parameters and the three-dimensional model, and sequentially printing the subchondral bone layer, the transition layer and the scaffold cartilage layer. Model reconstruction and stress analysis are driven through medical image data, dynamic calibration of pore parameters is realized in combination with a structure optimization algorithm, multi-material printing and multi-stage crosslinking are utilized, the pore parameters are adjusted through a porosity dynamic adjustment model, and stent failure caused by stress concentration is avoided; the gradient printing and cross-linking synergistically enhance the stability of the scaffold and the slow release ability of bioactive ions, so that the cell migration efficiency, the collagen deposition quality and the osteochondral interface integration strength are remarkably improved.