8 results about "Plate fracture" patented technology

The application discloses a micro-nano circular plate fracture analysis method considering coupling of surface effect and plastic zone, and firstly establishes a three-dimensional curved surface coordinate system suitable for a surface layer, and then further corrects a Dugdale cohesion force model according to a superposition principle after considering surface correlation of the plate, and then simplifies the Dugdale cohesion force model into a hyper-singular integral equation by using Hankel transformation, and finally obtains influences of the surface effect on the plastic zone size and crack surface displacement by numerically solving the hyper-singular integral differential equation.The method can accurately capture the nonlinear coupling relationship between the crack size, the surface shear modulus, the torsional displacement and the stress intensity factor under the micro-nano scale, effectively corrects calculation deviation generated by traditional classical theory when the surface effect is ignored, ensures the accuracy of the fracture analysis under different scales, and realizes more accurate and more comprehensive theoretical description of the elastic-plastic fracture behavior of the micro-scale material.

We provide a packaging box that can be tilted significantly with a simple operation. [Solution] A top plate fracture guide line L1 is formed in the center of the top plate 20 in the front-rear direction, extending between the left and right edges of the left and right upper outer flaps 23 and 24. Left and right inclined fracture guide lines L2 and L2 are formed on the left and right side plates 13 and 14, continuing from both the left and right ends of the top plate fracture guide line L1 and extending to the front edges of the left and right side plates 13 and 14. A front plate fracture guide line L3 is formed on the front side plate 11, extending between the front ends of the left and right inclined fracture guide lines L2 and L2. The stand portion T is provided, which is divided and detachable by these fracture guide lines and has a roughly triangular shape in side view. Cutting guide lines L23 and L24 extend diagonally from the tip edges of the left and right upper outer flaps 23 and 24 to the top plate fracture guide line L1.

The invention relates to the technical field of rock stratum fracture grouting tests, in particular to a high-frequency pulsation grouting slurry diffusion testing system and method for tiny rock stratum fractures, and the high-frequency pulsation grouting slurry diffusion testing system comprises a slurry supply unit; the testing system further comprises a grouting pipe, an electromagnetic valve, a pulsation controller and a slab fracture model. One end of the grouting pipe is communicated with the slurry supply unit and is used for conveying slurry; the electromagnetic valve is arranged on the grouting pipe and is used for opening or closing the grouting pipe; the pulsation controller is arranged on one side of the electromagnetic valve, electrically connected with the electromagnetic valve and used for controlling the electromagnetic valve to be opened according to the rated pulsation frequency, and the rated pulsation frequency is larger than or equal to 0 hz and smaller than or equal to 10 hz; the plate crack model is arranged at the end, away from the slurry supply unit, of the grouting pipe and communicates with the grouting pipe. According to the method, the grouting advantages of the pulsating grouting method in the tiny cracks are verified, the higher the frequency is, the more obvious the advantages are, and meanwhile the diffusion uniformity of grout obtained after grouting is better.

The invention discloses a bending plate fracture test method and a fracture test auxiliary device, and belongs to the technical field of bending plate fracture tests. The technical problem that loading force cannot be applied to the bending plate due to the fact that the loading point of the bending plate is not on the bending plate body is solved. The fracture test method for the bent plate comprises the following steps: S1, positioning a loading point of a test, and determining the position of a loading plate; establishing a coordinate O (X, Y, Z) on the table top of the workbench, wherein the coordinate at the center of the table top of the workbench is (0, 0, 0); s2, the positions of a bending plate, a shape follow-up block, a first connecting plate, a second connecting plate, a third connecting plate and an adapter plate are determined, and mounting and fixing are conducted; and S3, applying a loading force to the bending plate through the loading plate according to design requirements, researching a fracture mode of the bending plate, and completing a fracture test. The bending plate fracture test device realizes the fracture test of the bending plate of which the loading point is not on the bending plate body, and can be used for researching the fracture mode of the bending plate at different loading positions.

The utility model relates to bulldozing shovel installation technical field discloses a kind of back ear plate anti-fracture reinforcing rib assemblies of bulldozing shovel, including bulldozing shovel, reinforcing member is set between two supporting arms, two ends of the side of reinforcing member away from bulldozing shovel are respectively fixedly set one ear plate, reinforcing member includes reinforcing frame and two linkage rods, reinforcing frame is fixedly set between two supporting arms and ear plate, two linkage rods are crossly set in reinforcing frame, damping member is connected between two linkage rods, one buffer is respectively arranged in the both ends of reinforcing frame, reinforcing frame supports supporting arm and ear plate, rib plate supports bulldozing shovel and reinforcing frame form longitudinal supporting force, reinforcing frame cooperates the two linkage rods of cross arrangement and forms diamond space and cooperates spring damper to respond the transverse shear force between two ear plates, support ear plate and bulldozing shovel from longitudinal transverse two directions, and stress dispersion forms multidirectional support, to avoid ear plate fracture caused by local overload.

The utility model discloses a heavy manipulator cross beam internal local fracture welding reinforcement structure, which comprises reinforcement main rib plates, a first reinforcement rib plate and a second reinforcement rib plate, the reinforcement main rib plates, the first reinforcement rib plate and the second reinforcement rib plate are arranged to be flat plate pieces, and the two reinforcement main rib plates are symmetrically arranged on the two sides of a local crack. The reinforcing main rib plates are parallel and fixedly arranged on the upper cover plate, the first reinforcing rib plate and the second reinforcing rib plate are fixedly arranged on the upper cover plate and arranged on the two sides of the reinforcing main rib plates respectively, and the second reinforcing rib plate is arranged between the two reinforcing main rib plates and fixedly connected with the two reinforcing main rib plates. The first reinforcing rib plate is fixedly connected with a reinforcing main rib plate and the upper cover plate at the same time; according to the utility model, online welding repair can be carried out on upper cover plate fractures on the heavy manipulator box body cross beam, the maintenance time is saved, the maintenance cost is reduced, the shutdown loss is reduced, and a guarantee is provided for reasonable production.

The invention discloses a heavy manipulator cross beam internal local fracture welding reinforcement structure and a reinforcement method, the heavy manipulator cross beam internal local fracture welding reinforcement structure comprises reinforcement main rib plates, a first reinforcement rib plate and a second reinforcement rib plate, the reinforcement main rib plates, the first reinforcement rib plate and the second reinforcement rib plate are arranged to be flat plate pieces, and the two reinforcement main rib plates are symmetrically arranged on the two sides of a local crack; the reinforcing main rib plates are parallel and fixedly arranged on the upper cover plate, the first reinforcing rib plate and the second reinforcing rib plate are fixedly arranged on the upper cover plate and arranged on the two sides of the reinforcing main rib plates respectively, and the second reinforcing rib plate is arranged between the two reinforcing main rib plates and fixedly connected with the two reinforcing main rib plates. The first reinforcing rib plate is fixedly connected with a reinforcing main rib plate and the upper cover plate at the same time; by means of the method, online welding repair can be conducted on upper cover plate fractures on the heavy manipulator box cross beam, the maintenance time is saved, the maintenance cost is reduced, shutdown losses are reduced, and a guarantee is provided for reasonable production assembly.

The application discloses a hydraulic fracture face reproduction and combined proppant conductivity testing method, which comprises the following steps: preparing a cylindrical sample and a flow guide plate body from obtained downhole cores, pouring concrete outside the cylindrical sample to form a standard cubic sample, and performing a hydraulic fracturing experiment on the standard cubic sample; performing three-dimensional laser scanning on the fracture of the cylindrical sample to extract a hydraulic fracture face, and carving the upper flow guide plate fracture face or the lower flow guide plate fracture face according to the extracted hydraulic fracture face; installing the upper flow guide plate fracture face and the lower flow guide plate fracture face in a flow guide chamber to perform a flow guide test, and calculating a proppant embedding degree value and a proppant crushing rate according to the test result. The application extracts the fracture face after the hydraulic fracturing experiment through three-dimensional laser scanning, obtains a numerical fracture face, carves a plurality of groups of flow guide plates with the same hydraulic fracturing fracture face by using a carving machine, and can truly obtain the flow guide capacity and embedding degree of mixed proppants of different quality quartz sand and ceramsite in the well.