6 results about "In plane strain" patented technology

The application discloses a strip filling body damage mode plane strain testing device and method. The testing device comprises a container (10), a containing cavity (101) with an open end, and at least one end face of the container (10) is a transparent face; a test piece (20) provided with a speckle on the surface and arranged in the containing cavity (101); a loader (30) comprising a pressing column (31) and arranged at the open end of the container (10) and configured to apply a load to the test piece (20); and a digital speckle device (40) comprising a high-definition camera (41) arranged at the transparent face of the container (10) and configured to acquire deformation image information of the test piece (20), analyze and calculate the image information to obtain stress and strain values of the test piece (20), and combine the stress and strain values with the image to analyze and obtain a damage mode of the test piece (20).

The present invention provides a method and system for predicting the fracture toughness of a steel material, a device, and a medium. The method comprises: acquiring carbon content distribution data of a steel material under test, selecting a carbon content from the carbon content distribution data and designating same as a target carbon content; calculating upper shelf impact energy and a temperature offset of the target carbon content by means of a first calculation model; generating a fracture toughness curve for the target carbon content on the basis of the upper shelf impact energy and the temperature offset; calculating tensile strength corresponding to the target carbon content by means of a second calculation model, and calculating yield strength corresponding to the target carbon content by means of a third calculation model; generating a blunting line equation for the target carbon content on the basis of the tensile strength and the yield strength; on the basis of the fracture toughness curve and the blunting line equation, generating plane-strain fracture toughness corresponding to the target carbon content; and collecting statistics about the plane-strain fracture toughness corresponding to each target carbon content to generate fracture toughness data of the steel material under test. The present invention can provide input for assessment of the ductile tearing failure of carbon-segregated structures.

The application provides a special-shaped grouting anchor rod supporting system and a selection construction method, and belongs to the technical field of underground engineering. The method first acquires physical and mechanical parameters of surrounding rock, a grouting body and a supporting structure; then a plane strain mechanical analysis model of a tunnel-grouting body-surrounding rock-supporting structure is established; based on the model, a finite element numerical simulation calculation model is established to analyze the mechanical response of various special-shaped grouting body sections under the same grouting amount; then, the mechanical response data are used as a judgment index, a multi-index decision method such as an analytic hierarchy process is adopted, and the optimal grouting body section form is comprehensively evaluated and optimized; finally, according to the optimized section, the anchor rod arrangement and grouting parameters are determined for construction to form a closed special-shaped grouting body. The application adopts the special-shaped grouting anchor rod supporting system and the selection construction method, realizes active optimization of the stress distribution of the surrounding rock, effectively controls the development of the plastic zone and the tunnel deformation, and improves the supporting effect and economy.

The application discloses a pipeline structure health monitoring and landslide early warning method and system, and the method comprises the following steps: S1, a centrifugal simulation test platform is built; S2, strain data collected by the centrifugal simulation test platform is acquired; S3, based on plane strain theory, the collected strain data is pretreated, including main strain calculation, azimuth calculation and data denoising; S4, data analysis is carried out on the pretreated data, including coupling law analysis and parameter influence quantitative analysis, and key influence laws are obtained; and S5, based on the key influence laws, early warning criteria are customized, and finally, a two-level early warning system is built, so that the real-time calculation and early warning of the azimuth and the main strain are realized. The application combines the main strain amplitude and the spatial azimuth, makes up for the defects that the traditional method only analyzes the strain size and ignores the direction, and realizes the accurate quantitative analysis of the mechanical response under the three-dimensional multi-axial stress of the pipeline.

A method for calculating the rolling load distribution of a rolling mill 10, comprising: calculating the contact arc length of at least one of the elastic recovery and elastic reduction regions based on Hooke's law under the plane strain condition of a rolled material 1, the force balance within the belt-roll contact of the rolling mill 10, and the stress distribution in the rolling direction approximated by a function that depends on the position coordinate in the rolling direction of the rolling mill 10; and calculating the rolling load distribution of at least one of the elastic recovery and elastic reduction regions based on the contact arc length.

The application discloses a clamping mechanism for a hot simulation test device and a sample compression method, relates to the technical field of metal material thermal deformation, and discloses a clamping mechanism for a hot simulation test device, which is used for clamping a sample, and the hot simulation test device comprises a driving piece and two clamping grooves. According to the technical scheme, the clamping mechanism is used for clamping the sample, the hot simulation test device comprises the driving piece and the two clamping grooves, clamping components are arranged on both sides of the thickness direction of the sample, and the plane of the sample is contacted with the conductive element, so that the plane strain state of the sample in the hot compression test simulation plate rolling process is realized, stress concentration and bending effect caused by uneven contact of the traditional knurled side are avoided, the simulation of the plane strain state is more accurate and reliable, and the accuracy and repeatability of test data are improved; the driving piece is used for controlling the movement of the clamping grooves, the clamping components can be flexibly adjusted in position, and stress distribution of the sample in the hot simulation test is closer to the actual rolling state.