7 results about "Stress axis" patented technology

The utility model belongs to the technical field of material mechanical property detection, and discloses a test piece positioning mechanism, a test piece clamping device and an in-plane shear performance detection device.The test piece positioning mechanism comprises a workbench and a positioning assembly, the workbench is used for bearing a clamp, the clamp is provided with a clamping groove, and a test piece can be clamped in the clamping groove; the positioning assembly comprises a driving part and a positioning part, the first end of the positioning part is connected with the output end of the driving part, the second end of the positioning part can be inserted into the clamping groove, the driving part is used for driving the positioning part to move in the width direction of the clamping groove, and one end of the positioning part is driven by the driving part to move by a preset distance in the clamping groove; according to the test piece clamping device, the clamping efficiency of the test piece clamping device is remarkably improved, the positioning and clamping time is shortened, it is guaranteed that the stress axis of the test piece coincides with the loading axis of a testing machine, and the accuracy of in-plane shear performance detection results is improved.

The invention discloses a method for repairing the tip of a single-crystal superalloy turbine rotor blade of a gas turbine, belonging to the technical field of rotor blade tip repair. The fast-frequency pulse mode of a DC fast-frequency pulse welding machine is used to reduce the heat input during the repair process and avoid the occurrence of tissue recrystallization. The directionally solidified superalloy welding wire used ensures that the tensile strength and high-temperature creep performance reach more than 85% of those of single-crystal DD5. The method of water-cooling the blade tenon and heating the blade tip is adopted. On the one hand, it ensures that the growth direction of the surfacing structure is parallel to the <001> orientation, eliminates the transverse grain boundaries perpendicular to the stress axis direction, and at the same time avoids the formation of grains with large orientation differences and abnormal grains, ensuring the overall thermal fatigue resistance of the blade. On the other hand, the surfacing layer at the blade tip is in a high-temperature state, effectively reducing the residual stress and improving the service life of the blade.

The utility model relates to an auxiliary sample bonding tool for a core material tensile shear test. Comprising a bottom plate, vertical plates are arranged on the two side edges of the bottom plate in the length direction, a jackscrew used for abutting against a bonding plate is installed on at least one vertical plate in a penetrating mode, positioning plates used for being in matched butt joint with a groove in one end of the bonding plate are arranged between the two vertical plates at intervals, and a moving gap used for moving of the bonding plate is formed between the two positioning plates. Through the structural design of the sample auxiliary bonding tool, the problems that in the prior art, when a core material and a testing tool are fixed in a manual bonding mode, the centering precision is low, the parallelism of two bonding plates and an adhesive layer are not uniform, visual adjustment depends on operators, strict parallelism of a sample and the stress axis of the tool is difficult to guarantee, and the working efficiency is high are solved. And the stress distribution is not uniform.

The application discloses a T-shaped damping inverted arch structure for a tunnel, which comprises a concrete partition wall, a drainage pipeline, a grid, a gravel layer, a concrete base and a spring damping device. According to the equal stress axis ratio theory, the excavation depth of the inverted arch structure is determined, the stability of the tunnel is ensured, the excavation positions are few, and the excavation disturbance area of the tunnel is reduced. The rubber concrete partition wall has a certain horizontal expansion and contraction, plays a damping role, and reduces the extrusion of the horizontal ground stress on the tunnel bottom, thereby reducing the tunnel bottom heave. The gravel layer arranged at the tunnel bottom uniformly disperses the force from the vehicle on the concrete base to the tunnel bottom, and is also beneficial to the drainage in the tunnel. The inverted arch structure adopts the rigid-flexible combination mode, provides a certain deformation space for the surrounding rock of the tunnel bottom, improves the stability of the tunnel bottom, and effectively controls the tunnel bottom heave.

The present invention discloses a method for calculating the permissible vertical compressive strain of the roadbed top surface taking into account the effect of principal stress axis rotation. The method comprises the following steps: obtaining the three-dimensional stress state under wheel load; quantifying the effect of principal stress axis rotation; correcting the permissible vertical compressive strain of the roadbed top surface; and calculating the vertical compressive strain of the roadbed top surface. The present invention uses #imgabs0# to characterize the influence of shear stress on principal stress, and converts (R s ) ave As an amplification factor for the vertical compressive strain caused by principal stress axis rotation, the revised allowable vertical compressive strain formula incorporates the effects of principal stress axis rotation and more accurately reflects the vertical compressive strain bearing capacity of the subgrade top surface under dynamic loads and principal stress axis rotation. By revising the traditional standard formula, calculation accuracy is improved, thereby optimizing subgrade design and reducing pavement damage caused by accumulated permanent deformation.

The invention discloses a hidden active fault geometric parameter discrimination method based on multi-track InSAR and stress field constraint, and belongs to the technical field of remote sensing. The method comprises the following steps of: extracting a spatial connecting line with a maximum deformation gradient value as a fault agent trace by acquiring a rising and falling InSAR co-seismic deformation diagram of a target area; constructing a mutual exclusion tendency hypothesis based on the trace, and screening a reasonable tendency by predicting and comparing multi-track deformation symbol distribution; and meanwhile, in combination with a local main pressure stress axis P orientation of field geological inversion, whether the maximum uplift area is located on a P-axis pointing side is judged so as to constrain the sliding type. According to the method, a fault model does not need to be preset, high-confidence-coefficient judgment of the tendency and the mechanism is achieved through the physical self-consistency of the multi-view InSAR and the actually-measured stress field, the problem of geometric multiplicity of solutions of the fault under the condition of no surface fracture is effectively solved, seismic structure interpretation reliability is remarkably improved, and key parameter support is provided for seismic risk assessment.

This application discloses a method and system for inverting and analyzing borehole fracture stress fields based on the right dihedral method, relating to the fields of geophysics and geological engineering technology. The method includes: batch loading fault data through a GUI interface and converting it to NED direction cosines; using the right dihedral method to divide the fault into compression and tension zones; using a coarse-fine two-stage grid search to determine the optimal principal stress direction and matching rate; searching for the minimum principal stress direction in the vertical plane and calculating the dual stress axis matching rate; finally, outputting the three principal stress directions based on the comprehensive matching probability and generating a stereographic projection map. This application improves data input efficiency through batch loading via a GUI interface; the two-stage grid search algorithm eliminates human error and improves the calculation accuracy of the optimal principal stress direction and matching rate; multiple statistical indicators provide quantitative evaluation, improving the reliability of the inversion results; and the GUI interface's visualization of the inversion results enhances engineering applicability and interactive efficiency.