6 results about "Stress process" patented technology

The invention provides a method and device for searching a stress extreme point, electronic equipment and a storage medium, and relates to the field of pressure vessel stress analysis, and the method for searching the stress extreme point comprises the steps: carrying out the elastic stress analysis of a pressure vessel bearing a cyclic load, and obtaining a first stress sequence; connecting the first stress sequence end to end to form a stress process cycle to obtain a second stress sequence; deleting equal stress components of adjacent comparison time points in the second stress sequence, and retaining the stress component of the first comparison time point to obtain a third stress sequence; and performing trend vector comparison on the stress components in the third stress sequence to obtain a stress extreme point sequence. The accuracy of searching the stress extreme point is improved.

The invention discloses a method for calculating the conversion strain rate of an environmental fatigue correction factor, and the method comprises the steps: calculating an average strain rate and a strain range based on the peak stress and valley stress of a transient combination in fatigue calculation, and obtaining the environmental fatigue correction factor under each combination through weighting. According to the method, the peak value and the valley value in the stress change process are considered, the influence of the stress process of the structure on the environmental fatigue correction factor can be considered, the influence of transient stress fluctuation can be simplified and enveloped through the average effect of the peak value stress and the valley value stress, and the application range is wide.

The invention relates to the technical field of testing devices, and discloses a testing device for PE film production and a testing method thereof.The testing device comprises a fixing table and further comprises a pulling part installed on the fixing table; the fixing part is arranged on the pulling part; the pulling part comprises a hinge assembly, and the hinge assembly is arranged on the fixed table; the number of the telescopic assemblies is two, and the two telescopic assemblies are both installed on the fixing table; the hinge assembly comprises a first electric telescopic rod fixedly connected to the inner wall of the bottom of the fixed table. By arranging the pulling part, the problems that in the using process of an existing testing device, fluctuation or instantaneous impact is prone to occurring in pulling force output, the stress scene of the PE film in actual use is inconvenient to simulate, the progressive deformation state of the PE film in the stress process is difficult to accurately capture, and the testing accuracy is high are solved. And deviation between the fracture position and form and the actual use condition can be caused by sudden change of the tension.

This application provides a non-destructive testing method and system for steel based on multimodal data, relating to the field of materials testing technology. The method includes identifying the starting moment of the steel entering the plastic deformation stage based on the acoustic emission signal sequence during the stress process, and determining the time interval of the increasing activity of the acoustic emission signal; acquiring the metal magnetic memory signal and surface strain data within the time interval; further determining the location of the magnetic field gradient anomaly and the location of the strain concentration region of the steel; determining the spatial overlap region of the multimodal signals; performing multi-scale decomposition on the acoustic emission signals within the spatial overlap region of the multimodal signals, determining the cumulative degree of irreversible changes in the microstructure of the steel based on the abrupt change characteristics in the decomposed signals, and subsequently determining the test result of the steel. This application can realize dynamic monitoring of the transition of steel from the elastic stage to the plastic deformation stage during the stress process, accurately identifying changes in the internal microstructure of the steel and spatially locating them.

The invention discloses a pressure steel pipe and concrete combined stress analysis method, which belongs to a hydropower station pressure steel pipe stress analysis technology, is used for analyzing the stress of a pressure steel pipe by considering the combined stress condition of the hydropower station pressure steel pipe and the concrete of a pouring gap, and comprises the following steps of: determining that when the hydropower station is operated, determining the pressure of the pressure steel pipe; the water pressure P borne by the interior of the pressure steel pipe; the water pressure P1 when the interior of the pressure steel pipe is subjected to water pressure deformation in the exposed pipe state is obtained; the stress process of the pressure steel pipe is simplified into two stages under the real operation state, and in the first stage, before the pressure steel pipe makes contact with concrete, the pressure steel pipe is independently stressed; in the second stage, after the pressure steel pipe makes contact with concrete, the pressure steel pipe and the concrete are jointly stressed; finally, the stress states of all discrete units of the pressure steel pipe in the discrete state are obtained, the stress and strain states of the pressure steel pipe in the state are evaluated, the evaluation result is more accurate, and the size design of the pressure steel pipe can be optimized conveniently.

The present invention provides a cable protective cover simulation analysis method and system, which relates to the field of data processing technology. The method includes: determining a cable protective cover model; discretizing the cable protective cover model into multiple units; calculating the stress corresponding to each unit; obtaining the response characteristics of the entire cable protective cover model when subjected to force according to the stress corresponding to each unit and the dynamic equilibrium equation; analyzing the performance of the protective cover during the force-bearing process according to the response characteristics to obtain the performance analysis results; optimizing the protective cover according to the performance analysis results to obtain the final protective cover. The present invention can more accurately simulate the performance of the cable protective cover in an actual working environment.