6 results about "Yield limit" patented technology

The application discloses a GIS busbar state control method, and relates to the technical field of GIS busbars, and comprises the following steps: arranging a GIS busbar in a GIS busbar state control device; determining axial stress of the GIS busbar in a temperature difference change state respectively; determining a deformation degree of the GIS busbar according to the axial stress and a material yield limit of the GIS busbar; and protecting the GIS busbar by the control device. According to the actual situation of a GIS busbar operation environment, axial stress of the GIS busbar in a temperature difference change state is tracked, so that potential temperature change defects of the busbar are determined, and the state of the GIS busbar is controlled by using the GIS busbar state control device, thereby reducing the risk that components are damaged due to deformation of the GIS busbar.

This invention provides a method and apparatus for detecting the reuse of centrifuge tubes in ultra-high-speed centrifuges, comprising the following steps: S1, pressurizing and filling a medium into a new centrifuge tube, and detecting the diameter deformation of the centrifuge tube online; S2, using the maximum pressure that the centrifuge tube can withstand to return to its initial diameter as the yield limit pressure value; S3, replacing the centrifuge tube to be reused, pressurizing and filling the centrifuge tube to be reused with a medium, controlling the reuse pressure value at 75%~95% of the yield limit pressure value; S4, detecting the diameter deformation of the centrifuge tube to be reused online; S5, selecting the centrifuge tube that can return to its initial diameter as the reuse centrifuge tube. This invention can detect centrifuge tubes and determine whether they can be safely reused, significantly reducing experimental costs. It can be used to detect whether replacement centrifuge tubes meet the application requirements of ultra-high-speed centrifuges. It prevents substandard centrifuge tubes from entering the ultra-high-speed centrifuge, causing equipment damage or even sample leakage.

This invention discloses a variable contact rolling-sliding composite bearing and its design method, relating to the field of bearing technology. The bearing includes an outer ring, an inner ring, bearing rollers, and a cage. The diameter of the bearing rollers is larger than the axial height of the cage to form an initial clearance. When the external load is small, the bearing rollers bear the load alone, and the bearing is in a pure rolling contact state. When the external load increases to the point that the bearing rollers undergo elastic deformation and the initial clearance closes, the end face of the cage contacts the raceway surface of the outer ring, sharing the load with the bearing rollers, and the bearing switches to a rolling-sliding composite contact state. The design method involves: calculating the roller deformation to determine the critical load; establishing a spring stiffness model for the rollers and cage to solve for the load distribution; checking whether the cage contact stress is lower than the yield limit; if it exceeds the limit, increasing the initial clearance and iteratively optimizing. This invention achieves adaptive switching of the bearing's operating mode, enabling low friction under light loads and high load capacity under heavy loads, and the design method is universal and reliable.

The application discloses a composite stress relieving device for aluminum plate in the field of plate flattening, which comprises a roller flattening machine and a stretching mechanism. The roller flattening machine is formed by the staggered arrangement of upper roller groups and lower roller groups into an S-shaped shaping channel for repeatedly bending the aluminum plate. The roller shafts rotate synchronously through a driving mechanism and convey the aluminum plate to advance. The stretching mechanism has clamping jaws and a hydraulic driving mechanism to exert an axial traction force on the aluminum plate. The traction linear velocity of the stretching mechanism is configured to be greater than the linear velocity of the roller shafts in the roller flattening machine, so as to form a stable speed difference between them to force the aluminum plate to plastically extend in the S-shaped shaping channel along the axial direction. Through the combined action of the two plastic deformations, the overall cross section of the aluminum plate is in a plastic stress state exceeding the yield limit, thereby realizing the synchronous and efficient elimination of the in-plane and thickness direction residual stress of the aluminum plate. The technical scheme effectively integrates the stress relieving process, and significantly improves the stress relieving efficiency.

The application provides a force-bearing casing support plate and mounting edge axial distance design method, and relates to the technical field of an aero-engine. The method comprises the following steps: S1, determining the maximum load of the force-bearing casing mounting edge according to a set engine design method; S2, equivalent the force and moment of the maximum load acting on the casing mounting edge to a maximum resultant force F 合 ; S3, taking the material yield limit as the maximum stress limit value of the force-bearing support plate root rounding position, calculating the minimum axial distance l min of the force-bearing casing support plate and the mounting edge according to the maximum resultant force F 合 of the force-bearing casing mounting edge; S4, taking the minimum rigidity of the casing mounting edge as the minimum rigidity of the casing mounting edge according to the maximum resultant force F 合 , calculating the maximum axial distance l max of the force-bearing casing support plate and the mounting edge according to the minimum rigidity. The application can guarantee that the maximum stress level and the minimum deformation of the casing meet the design requirements, and realize the optimal solution of the strength life and the rigidity.

The application provides a ship three-dimensional design method and system for finite element analysis, comprising the following steps: S1, obtaining a ship design specification, wherein the ship design specification comprises design information such as ship length, ship width, ship height, ship speed and ship structure requirements; S2, constructing an entity model in a three-dimensional design software according to the ship design specification; S3, obtaining structure information of a plate, a profile, a knee plate and a hole in the entity model, generating a facet structure according to the structure information in the entity model, and combining corresponding material properties such as material density, elastic modulus, Poisson's ratio and yield limit in a model base library to generate a facet model for finite element analysis; and S4, performing finite element analysis on the facet model, and adjusting the constructed entity model in the three-dimensional design software according to the finite element analysis result. The method reduces the operation of a designer, improves the model design efficiency and shortens the ship design cycle.