6 results about "Stress change" patented technology

The application discloses a kind of rock burst damage phenomenon's fraction compensation control method, belong to geotechnical engineering technical field, comprising the following steps: S1: geological exploration;S2: prestressed anchor cable system construction;S3: place, fixed stress monitoring element;S4: anchor cable placement and hole grouting treatment;S5: initial tensioning;S6: rock burst section excavation;S7: fraction compensation tensioning;S8: rock burst zone excavation is completed.The application uses anchor cable prestressed tendon, cooperates the real-time stress monitoring result of rock mass, obtains the stress change of rock mass after stress release under external force, according to stress change, fraction compensation tensioning is carried out to prestressed anchor cable, to meet the external force acting on rock mass, reach the balance when rock mass is undisturbed, avoid the harm caused by rock burst.

The application relates to the technical field of injection molding process control, and discloses an intelligent regulation and control elimination method and system for internal stress of an injection molded part. The method is used for monitoring temperature and time data in the forming process of the injection molded part in real time, constructing a stress distribution field in a glass transition temperature interval through numerical simulation, extracting a threshold value in combination with a material characteristic database to determine a stress change turning point time position, comparing stress locking stage values based on the time position, dividing a high-risk area and determining an intervention priority, screening an intervention opportunity window, establishing a dynamic corresponding relationship between time and stress, and determining an optimal intervention time point for internal stress regulation under the condition that stress is not completely locked and elimination efficiency is optimal. The application can accurately position an internal stress intervention opportunity, improve stress elimination efficiency and injection molded part forming quality, effectively avoid problems such as deformation and cracking caused by excessive internal stress, and adapt to the intelligent regulation and control requirements of high-precision injection molding.

This invention relates to a method for expressing the physical properties of an elastic material when there is a change in strength in a plastic region. The method includes: a region setting step, wherein the region setting step defines a base region indicating the relationship between strain and stress in the first material and a variation region indicating the portion of stress change according to strain caused by factors induced by the pre-straining and heat treatment of the second material in a first material; and a simulation step, wherein the simulation step expresses the relationship between stress change and pre-strain in the variation region as a Boltzmann function, and derives the relationship between strain and stress in the second material as the sum of stresses according to strain in the base region and the variation region.

This invention discloses a test device for monitoring deformation and stress changes in roadway surrounding rock, comprising: a mounting plate with four L-shaped vertical plates; a pressure assembly including multiple vertically mounted, rectangularly arranged pressing components on the mounting plate, each pressing component having a downward-facing telescopic end and a pressure plate at each telescopic end, the pressing components driving the pressure plate downward to apply test pressure to the test specimen; a detection assembly with a moving trolley at its bottom, the moving trolley driving the detection assembly to move closer to or further away from the test specimen, the detection assembly being able to insert into the corresponding test position on the test specimen during movement, and also being able to rotate, expand, or retract to cooperate with the pressing components in performing test measurements on the test specimen; and a sensing assembly mounted on the mounting plate. This invention can simulate relevant roadway conditions and perform test monitoring, thus facilitating practical use.

The application discloses a stope overburden load three-dimensional model construction method, relates to the model construction technical field, and comprises the following steps: obtaining a sample data scatter diagram based on sample data of an overburden to be detected; obtaining a first stress threshold value and a second stress threshold value based on the sample data scatter diagram; obtaining a stress representation value based on the first stress threshold value and the second stress threshold value; obtaining a stress change function based on the stress representation value; obtaining generated data points based on the overburden to be detected; obtaining a first detection point based on the generated data points; obtaining a real-time stress value based on the first detection point and the stress change function; obtaining a function fitting stress based on the stress change function and the real-time stress value; and generating a stope overburden load three-dimensional model based on the function fitting stress. The application is used to solve the problem of low stress acquisition accuracy of an instrument at an undetected position in the prior art model construction technology, thereby improving the accuracy of the stope overburden load three-dimensional model construction.

The application discloses a stress-life model considering the influence of stress gradient and micro-sliding amount of the edge of a contact area in a plane contact state, designs a mathematical model for calculating the fatigue life of a component by using stress in the plane contact state considering the plane stress gradient and the influence of the micro-sliding of the contact area, and introduces the stress gradient of the edge of the contact area and the sliding displacement amount of the edge of the contact area for the plane contact problem on the basis of the most basic stress-life equation, and corrects the stress term on the left end of the equation, so that the stress-life model has good fitting effects on high-cycle fatigue and low-cycle fatigue and has good physical significance. When the stress-life model is applied, only the data of the stress change and the relative sliding amount of the structure are needed, and then the life prediction calculation can be performed, so that the process of the fatigue life prediction is simplified.