3 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 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.