10 results about "Stress limit" patented technology

The application discloses a room temperature bending fatigue life improvement and prediction method of a ceramic piece containing microcracks, and belongs to the technical field of mechanical structure strength. The method comprises the following steps: collecting the spatial information of microcracks on an original ceramic piece, testing the power index and critical fatigue life of the original ceramic piece; processing the microcracks into circular holes according to the spatial information of the microcracks, performing a polishing and cleaning process on the circular holes, obtaining a processed ceramic piece, and completing room temperature bending fatigue life improvement; performing size measurement on the circular holes to obtain the radius and cross-sectional area of the circular holes, calculating the stress limit of the processed ceramic piece under the action of static load by using the radius and the cross-sectional area; drawing an S-N curve of the processed ceramic piece by using the stress limit, the power index and the critical fatigue life; and testing the maximum bending stress of the processed ceramic piece, taking the corresponding abscissa of the maximum bending stress on the S-N curve as the prediction result of the room temperature bending fatigue life.

The utility model relates to the technical field of detection equipment, in particular to an anti-falling device of foreign object detection equipment for an FOD runway. The device can buffer instant impact force, the instant stress limit value of the mooring rope is reduced, the occurrence rate of breakage accidents at the connecting position of the mooring rope is reduced, and the device is safer and more reliable. Comprising a supporting mechanism, a detection module and an anti-falling buffer mechanism, the supporting mechanism comprises a mounting chassis, an easy-to-break rod and a supporting rod, the easy-to-break rod and the supporting rod are both of a hollow structure, the easy-to-break rod is provided with an easy-to-break point, the lower end of the easy-to-break rod is connected with the mounting chassis, the upper end of the easy-to-break rod is connected with the lower end of the supporting rod, and the upper end of the supporting rod is fixed to the detection module; the anti-falling buffer mechanism comprises a mounting plate fixedly connected with the mounting chassis, a universal ball fixedly mounted on the mounting plate, a universal seat rotationally connected with the universal ball, a plurality of retaining ropes and a plurality of connecting springs, the retaining ropes are uniformly distributed in the circumferential direction of the universal seat, and one end of each retaining rope is fixedly connected with the edge of the universal seat.

An embedded straddle-type upper pressure roller structure for a single-end precision milling machine for wooden windows belongs to the field of machining technology. The pressure roller of the embedded straddle-type upper pressure roller and the roller table are arranged vertically opposite each other on the single-end precision milling machine, clamping and feeding the wooden window. This invention uses a spring to connect the embedded straddle-type upper pressure roller and the scissor-lifting platform. This structure changes the range of preload force on the wooden window by changing the type of spring. The spring is easy to replace and has low maintenance costs. By adjusting the type of spring and the height of the scissor-lifting platform, adaptive clamping of wooden windows of different thicknesses or materials can be achieved. The spring spacing adjustment mechanism can independently adjust the compressible stroke and initial pressure of the spring, adjusting the levelness of the embedded straddle-type upper pressure roller to ensure the shape accuracy during wooden window processing. Furthermore, by adjusting the type of spring and the height of the scissor-lifting platform, the stress limit on the wooden window can be further controlled.

The application relates to the technical field of oil and gas exploitation, and discloses a complex well open-hole plugging completion device, which comprises a sleeve, a head threadedly connected to the top of the sleeve and a sealing head threadedly connected to the bottom of the sleeve, an opening is arranged at the bottom of the head, and the device further comprises an annular groove arranged on the side wall of the sleeve, a rubber cylinder fixedly arranged on the side wall of the sleeve at the annular groove, a feeding port one arranged on the inner wall of the sleeve below the annular groove, a pipe groove arranged in the side wall of the sleeve, and the two ends of the pipe groove are communicated with the annular groove and the feeding port one respectively, a support frame arranged on the inner wall of the sleeve, a compression spring one fixedly connected to the top of the support frame, and a moving sleeve fixed to the tail end of the compression spring one. The pump pressure real-time adjustment system dynamically calculates the stress limit of a pin shaft and the stress of a connecting sleeve, temperature compensation models and pressure drop loss compensation are combined, pump pressure precise closed-loop control is realized, and the problems of pin failure and pressure overshoot caused by temperature change of a traditional device are solved.

The present disclosure provides a data processing device, a bridge stiffness evaluation system, a data processing method, a bridge stiffness evaluation method, a storage medium and a computer program product, which first determines the position-displacement mapping relationship between a plurality of positions of the stiffening beam of the suspension bridge and the lateral displacement under the action of the transverse wind load, then determines the position-stress mapping relationship between the plurality of positions and the stress through the position-displacement mapping relationship and the displacement-stress mapping relationship, then determines the maximum stress position point in the plurality of positions according to the position-stress mapping relationship, and finally determines the transverse deflection-span ratio limit value of the stiffening beam through the operation relationship between the maximum stress position point and the corresponding maximum stress value, the operation relationship between the maximum displacement position point and the corresponding maximum lateral displacement, and the stress limit value of the stiffening beam.

The present disclosure provides a data processing apparatus, a bridge stiffness evaluation system, a data processing method, a bridge stiffness evaluation method, a storage medium, and a computer program product. The apparatus first determines a position-displacement mapping relationship between a plurality of positions and lateral displacements of a stiffening girder of a suspension bridge under the action of a transverse wind load, then determines a position-stress mapping relationship between the plurality of positions and stresses on the basis of the position-displacement mapping relationship and a displacement-stress mapping relationship, then determines a maximum stress position point among the plurality of positions on the basis of the position-stress mapping relationship, and finally determines a transverse deflection-to-span ratio limit value of the stiffening girder on the basis of an operation relationship between the maximum stress position point and a corresponding maximum stress value, an operation relationship between the maximum displacement position point and a corresponding maximum lateral displacement, and a stress limit value of the stiffening girder.

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 invention discloses a shape and position control method, device and equipment of a multi-layer heterogeneous spherical shell structure and a preparation method, and relates to the technical field of design of the multi-layer heterogeneous spherical shell structure. The method comprises the following steps: firstly, deducing a working strain interval of each interlayer filling material based on basic parameters of the multilayer heterogeneous spherical shell, and iteratively adjusting a working stress lower limit of each interlayer filling material according to an end face closing condition by considering a load, a stress limit value in a vibration environment and a tangent modulus constraint; and the stress of the whole structure is at the lowest level while the shape and position state control of the structure in a related environment is met.

The invention relates to the technical field of automobile safety, and particularly discloses an automobile structure safety design method based on multi-attitude simulation, which comprises the following steps: constructing an automobile composite attitude, analyzing and identifying multi-load direction nodes through load path overlapping, and screening failure risk nodes in combination with stress redundancy; calculating a simulation priority based on a failure risk node risk coefficient and a composite attitude historical incidence rate, carrying out simulation positioning of stress exceeding nodes, and dividing types; according to the method, the node optimization type is judged through the standard exceeding proportion, the nodes needing structure optimization are reinforced in combination with the maximum stress standard exceeding degree, differential path adjustment is conducted on the nodes needing path optimization according to the type, and the problems that in traditional automobile structure design, due to the fact that the composite attitude load coupling effect is neglected, the single working condition reaches the standard, and the composite working condition fails are solved; accurate recognition and targeted optimization of the automobile structure risk under the composite posture are achieved, and meanwhile the frequency of later simulation model adjustment and computer and auxiliary equipment repair is reduced.