20 results about "Type fracture" patented technology

The invention discloses a method for evaluating rock mass fracture freeze-thaw fracture damage risk based on surface temperature, which comprises the following steps: S1, carrying out data acquisition on a target area based on a multi-source sensor carried by an unmanned aerial vehicle platform, and obtaining fracture geometric parameters, daily surface minimum temperature, daily surface maximum temperature, daily temperature difference and fracture moisture conditions; s2, on the basis of the geometric parameters of the crack, constructing a crack frost heaving force analytical model; obtaining a quantitative relation between the stress intensity factor and the environment temperature; s3, the I-type fracture toughness of the target rock mass is measured, and the critical crack initiation temperature of the rock mass is determined; determining the number of critical freezing and thawing cycles; s4, on the basis of the daily earth surface minimum temperature, the daily temperature difference, the fracture moisture condition and the critical crack initiation temperature, the annual accumulated effective freezing and thawing cycle number is obtained; and calculating a freeze-thaw damage ratio, and carrying out risk quantification and grading. According to the invention, the problem of inaccurate evaluation caused by limitation to local monitoring and lack of an environment factor and material parameter integrated evaluation framework in the prior art is solved.

The application discloses a test method for studying the connection mechanism of hydraulic fractures and high-angle shear type fractures, and belongs to the technical field of indoor test of rock mass hydraulic fracturing. The test method for studying the connection mechanism of hydraulic fractures and high-angle shear type fractures preforms a through fracture at the side of a sample close to the top, performs high-temperature thermal shock treatment on the inner side of the through fracture, thereby forming a gradient damage zone, and processes a perforation upward in the middle of the bottom surface of the sample; the treated sample is placed in an experimental device, and a plurality of acoustic emission probes are pasted on the surface of the sample; a surrounding pressure and an axial pressure are sequentially applied by using a staged loading mode, then high-pressure water fracturing is continuously carried out in the perforation at a constant rate, and the fracture pressure and the corresponding flow rate are recorded when the sample is broken; the hydraulic fracturing process is analyzed according to the flow-pressure curve obtained by the test and the information collected by the acoustic emission probes, and the connection law of the hydraulic fracturing fractures and the through fractures is obtained by combining the CT three-dimensional reconstruction technology after the test.

The invention discloses a multi-angle rotating ultra-high core wall dam gravel-doped clay tensile-fracture test device which comprises a mold assembly, two groups of adjusting assemblies and two groups of loading assemblies, a dumbbell-shaped cavity is formed in the mold assembly body and is used for preparing and bearing a test soil test piece; the two sets of adjusting assembly bodies are distributed on the two sides of the mold assembly body in a central symmetry mode, each adjusting assembly body comprises a rotatable semicircular disc and a semicircular disc track, the rotatable semicircular discs are coaxially embedded in the inner sides of the semicircular disc tracks, and the semicircular disc tracks are movably connected with the rotatable semicircular discs; and the end part of the mold assembly body is embedded into the inner side of the semicircular disc track and is detachably connected through a mold fixing bolt. The front loading assembly, the front assembly body, the rear loading assembly, the rear assembly body and the mold assembly body are used in cooperation, the operation process is convenient and rapid, the device can be suitable for a uniaxial tensile test, a tensile fracture test, a shear fracture test, a tension-shear fracture test and a compression-shear fracture test at the same time, and the application range is remarkably widened.

The utility model provides a sample preparation tool for an I-type fracture toughness test. The sample preparation tool comprises a platform, the upper surface of the platform is horizontal and is used for placing a lower-layer base material; a base material limiting mechanism; the limiting device is arranged on the upper surface of the platform and is used for limiting the end parts of the laminated lower-layer base material and the upper-layer base material and limiting the displacement of the lower-layer base material and the upper-layer base material in the horizontal direction; the film fixing mechanism comprises a first gasket, a second gasket and a gasket pressing part; the first gasket is arranged on the upper surface of the platform, and the thickness of the first gasket is the same as that of the lower-layer base material located at the bottom; the second gasket is arranged on the first gasket, and the thickness of the second gasket is the same as that of an adhesive layer between the lower-layer base material and the thin film; the gasket pressing part is used for pressing the second gasket and the first gasket to the upper surface of the platform. When the sample preparation tool for the I-type fracture toughness test is used for sample preparation, the accurate position of a film in a sample and the accurate and uniform thickness of an adhesive layer can be ensured, and the tool is simple to operate and high in sample preparation efficiency.

The invention provides a slice type fracture water seepage pressure testing device which comprises a detection module, the detection module comprises an elastic substrate, a strain gauge and a waterproof layer, the strain gauge is arranged on the elastic substrate, the waterproof layer at least covers the strain gauge, and the strain gauge is used for detecting the water seepage pressure of the fracture when the detection module is arranged in the fracture. Different deformation quantities are generated according to different water pressures in the fractures; the signal input end of the processing module is connected with the signal output end of the strain gauge, and the processing module is used for collecting the deformation quantity of the strain gauge according to a preset sampling frequency range, obtaining the water pressure of the crack according to the deformation quantity of the strain gauge and recording the obtained water pressure along a timeline. According to the slice-type crack water seepage pressure testing device, the slice-type detection module can be easily inserted into a crack with a narrow space and can be matched with the processing module to accurately test the crack water seepage pressure, the overall structural design of the device is simple, and the manufacturing cost is effectively reduced.

The invention discloses an ankle joint fracture dorsal extension adduction position polymer splint positioning adjusting device which comprises a bottom plate, a clamping mechanism, a placing mechanism, an adduction adjusting mechanism and a foot abutting mechanism, a transverse through opening is formed in the bottom plate, a sliding groove is formed in the bottom plate, and the transverse through opening and the sliding groove are perpendicular to each other in the direction; the clamping mechanism is arranged on the transverse through opening, the placing mechanism is fixedly arranged at one end of the sliding groove, and the inward extending adjusting mechanism is arranged on the sliding groove in a sliding mode. And the inward stretching adjusting mechanism comprises an alignment plate, a pushing and pressing assembly, a pressing plate assembly, two arc plate blocks, two pushing and pressing assemblies and an adjusting assembly, so that the fractured feet of a patient can be accurately pushed and fixed through the device, accurate regulation and control and stable maintenance of the individualized dorsal stretching adduction angle are achieved according to the differential requirements of eversion type fractures of different types, and the individualized dorsal stretching adduction angle can be accurately adjusted and controlled. The ankle point relation is effectively guaranteed to be accurately reset and continuously kept, and the problem of poor reset caused by body position deviation is solved.

The application discloses a gel microsphere profile control agent application scene determining fractured core plugging experiment method, and comprises the following steps: S1, primary water flooding; S2, core fracture making: S2-1, making full open type fracture; S2-2, making closed type fracture; S3, gel microsphere profile control agent displacement; S4, secondary water flooding.The application provides a special fractured core plugging experiment method for the characteristics of high shear resistance and high salt tolerance of the gel microsphere profile control agent, especially when the closed type fracture is made, the influence of various factors is comprehensively considered, so that a more accurate fracture cutoff position is obtained, the demand of the gel microsphere profile control agent is met, the experiment result accuracy is improved, and the plugging effect of the full open type fracture is compared, finally, a perfect experiment step system is formed, so that the gel microsphere profile control agent has practical application value when being used in a reservoir with strong heterogeneity and large pore throat size difference.

The invention discloses a test method for multi-angle testing of tensile-fracture characteristics of extra-high core wall gravel-doped clay. The test method comprises the following steps: planning test working conditions; preliminarily assembling the front loading component and the front assembly body, and the rear loading component and the rear assembly body; adjusting the positions of the front loading assembly and the rear loading assembly; assembling the mold assembly, and preparing a test soil test piece; adjusting the relative positions of the front loading assembly and the rear loading assembly; connecting the mold assembly with the front assembly and the rear assembly; exposing the test soil test piece; and applying an acting force and recording test data. According to the invention, measurement of tensile and fracture characteristics of a test soil test piece at multiple angles is realized; when the angle between the loading force and the test soil test piece is 0 degree, a uniaxial tensile test and a tensile fracture test can be carried out; when the angle between the loading force and the test soil test piece is 90 degrees, a shear type fracture test can be carried out; when the angle between the loading force and the test soil test piece is 1-89 degrees, tension-shear and compression-shear fracture tests can be carried out, and the research on the fracture characteristics of the soil body under the influence of different angles is perfected.

The invention relates to a design method of a femoral neck minimally invasive fixing system. The design method comprises the steps that a femoral neck three-dimensional model containing a Pauwels III type fracture line is established based on CT scanning data, and bone material attributes are defined; importing an internal fixation system preliminary model containing a femoral neck power cross nail and a near-end hollow nail into the model, and setting the size and position parameters of the internal fixation system preliminary model; setting finite element analysis conditions for the model, and applying a load simulating a physiological state to calculate stress distribution, displacement and fatigue life; identifying a stress concentration area based on an analysis result, and adjusting design parameters according to the stress concentration area; and repeating the iteration steps of finite element analysis and parameter adjustment until the stress distribution is uniform and the maximum stress is lower than the yield strength of the material. Compared with the prior art, computer simulation is used for replacing a traditional physical test, the structure of the internal fixing system can be rapidly optimized, the research and development period is remarkably shortened, and the risk is reduced.

The invention provides a three-type fracture grid insensitive strain energy density calculation method which comprises the following steps: S1, obtaining the size of a pipe joint subjected to three-type fracture, and obtaining basic parameters of a stress field analytical solution based on the size of the pipe joint subjected to three-type fracture; s2, performing finite element calculation to obtain a traction-force-based structural stress which is insensitive to a use grid; s3, calculating a first undetermined coefficient c and a second undetermined coefficient d based on the structural stress; s4, calculating a stress component of the notch based on the first undetermined coefficient c and the second undetermined coefficient d to obtain an analytical solution of a stress field; and S5, sequentially solving a notch strain field and a strain energy density field based on the analytical solution of the stress field, and finally obtaining the strain energy density. The invention provides a solving method of a stress field of a sharp V-shaped notch for describing structural stress based on traction force under type III fracture.

The novel fracture minimally invasive surgery positioning and guiding device comprises a positioning pipe, a guiding pipe and an arc-shaped movable arm, the arc-shaped movable arm comprises a first movable arm body and a second movable arm body, and one end of the first movable arm body is movably connected with one end of the second movable arm body through a locking structure; the other end of the first movable arm and the other end of the second movable arm are provided with a positioning pipe and a guiding pipe respectively, the second movable arm is provided with a first guiding opening formed in the extending direction of the second movable arm, and the first movable arm, the second movable arm and the first guiding opening are all in an arc shape and are the same in circle center. The locking structure comprises a positioning block, a first fixing piece for fastening or loosening the positioning block and the first guide opening, and a second fixing piece for fastening or loosening the positioning block and the first fixing hole, so that the first movable arm has a sliding state and a rotating state, and accurate positioning and dynamic adjustment of a three-dimensional space of the guide pipe are realized; and an efficient, accurate and safe solution is provided for the complex orthopedic surgery.

The invention relates to a controlled expansion-limited partition inflatable fracture external fixation splint device which comprises a deformable splint close to the to-be-fixed parts of the limbs of the human body and a control unit arranged on the deformable splint, a binding and fixing assembly is installed on the deformable splint, and a plurality of sets of air bag units are arranged on the inner wall of the deformable splint. An air supply unit is arranged on the outer wall of the deformable clamping plate; each air bag unit is provided with an electromagnetic valve used for controlling air inlet and pressure relief, the electromagnetic valves are connected with the air supply unit through air distribution pipelines, and pressure sensors used for monitoring pressure are arranged in the air bag units. The device adopts a partitioned air bag design and is matched with an electromagnetic valve and a pressure sensor to realize independent pressure control of each air bag unit, and supporting pressure of different regions can be accurately adjusted according to the specific form and swelling degree of a fracture part, so that the fixing force better fits the physiological form of an affected part, and blood circulation disorder caused by too tight local compression is avoided; therefore, the bone fracture fixing device is suitable for fixing requirements of various types of bone fractures.

The invention relates to the technical field of material mechanics testing and composite material performance characterization, and discloses a titanium steel composite plate interface I-type fracture toughness testing device which comprises an upper fork arm, an upper cantilever beam, a bonding layer, a composite plate sample, a lower cantilever beam, a connecting pin, a locking nut, a lower fork arm and the like. A crack is prefabricated at the interface of the head end, grooves are transversely machined in the two sides, the grooves are transversely formed in a composite plate sample, the interface bonding area is reduced, accordingly, the bonding area is relatively increased, early failure of a bonding layer is avoided, the device can adapt to titanium steel composite plates with different thickness and modulus combinations, and it is guaranteed that the crack stably expands along the interface.

The invention discloses an accurate recognition and targeted grouting plugging system and method for through type fractures around a drilling well. According to the system, a U-shaped drilling hole group is located between a water-bearing layer and a hydraulic fracturing well; the peeping assembly is used for peeping a crack in the first U-shaped drill hole; the flow metering assembly is used for collecting flow data of the downstream side of the fracture; the tracer liquid dispenser is used for dispensing tracer liquid; the water pumping mechanism is used for performing water pumping operation on the U-shaped drill holes I and II; the grouting plugging mechanism is used for performing grouting plugging on the crack; the fracturing and drainage composite mechanism is used for fracturing and drainage operation; the coal bed gas extraction device is used for extracting gas resources. The method comprises the following steps: performing fracturing operation on a hydraulic fracturing well; marking crack positions; the tracer fluid is put, drainage operation is synchronously conducted on the first U-shaped drill hole, flow data of all fractures are obtained, and the positions of the through fractures are determined; carrying out targeted plugging on the through fractures; and gas is extracted. According to the system and the method, accurate identification and targeted plugging can be carried out on fractures, and meanwhile, efficient gas extraction operation can be realized.

The invention provides a rock composite fracture simulation method based on energy level least square near field dynamics, and relates to the technical field of rock engineering. The method comprises the steps that a load is applied to a numerical model of rock to be measured, the numerical model is simulated based on least square near-field dynamics, whether the numerical model is damaged or not is judged through a mixed energy failure criterion, and the mixed energy failure criterion is pre-constructed based on I-type fracture critical energy density and II-type fracture critical energy density; and judging whether the current total load step reaches a preset total step number or not after the damage occurs, if the current load is not kept unchanged, continuing to apply the load to the numerical model until the current total load step reaches the preset total step number. By combining the real strain energy state of a near-field dynamic bond with a mixed energy failure criterion, the development process of stretching, shearing and mixed cracks in the rock is accurately described. And the prediction accuracy of the damage mode of the rock mass in the complex stress environment is obviously improved.

The invention relates to a method for constructing parameters of a fracture cohesion model of a fragile structural adhesive, and belongs to the technical field of mechanical property testing and numerical simulation of fragile structural adhesives. According to the technical scheme, cohesion model parameters are constructed for I-type fracture and II-type fracture of a brittle structure, and the parameters are directly used for finite element simulation of related interface units; performing a tensile fracture test on the sample under a tensile testing machine, and establishing a finite element model of steel block connection; and converting the stress-strain curve into a stress-displacement curve, and calculating related parameters. The method has the beneficial effects that accurate construction of fracture cohesion parameters of the fragile structural adhesive is realized, a standardized data interface is provided for failure analysis of an adhesive joint structure, and finite element simulation efficiency and engineering application value are remarkably improved.

This invention provides a method and impact-type fracturing device for hard rock, relating to the field of engineering development technology. The method includes: forming multiple pre-splitting holes with small intervals along the outline of the working face at its edge; forming a larger central compensation hole at the center of the working face; dividing the area between the central compensation hole and each pre-splitting hole into multiple impact rock-breaking points; inducing rock-breaking at these points to create a continuous path that extends from the impact rock-breaking points towards the pre-splitting holes and the central compensation hole, and these paths become interconnected. By constructing a "pre-splitting weakening - central stress relief - multi-point synergistic impact" approach, controllable expansion and connection of the crack network at the working face are achieved, allowing the cracks to form stable continuous paths under weakened structural constraints. This method not only utilizes the central compensation hole for stress relief and induced stress redistribution, reducing the required rock-breaking capacity, but also results in a more uniform distribution of the continuous path, reducing the dispersion of rock block size.

A system and a method for planning human orthopaedic surgery for restoring the volume and / or the geometry of a bone, by expanding at least one expandable bone implant (1) between a folded configuration and a deployed configuration, the implant including a body extending along a longitudinal axis (L) between a proximal end (11) connectable with an implantation instrument (A) for holding the implant and a distal end (12) intended to be firstly inserted into the bone, wherein the system includes a plurality of expandable bone implants (1) and at least one planning support presenting the implants (1) and instrument (A), with reference to at least one standardized classification of the various types of fractures identified, in particular vertebral compression fractures, the planning aid being implementable in the form of a human-machine interface.

The application discloses a segment plug type fracturing method and application. The method comprises the following steps: adopting segment plug liquids and isolation liquids with different viscosities, adopting a lower displacement for the isolation liquid injection, adding a finer particle size of the proppant in the isolation liquid, reducing the sand plugging risk, improving the segment fracture complexity, and obviously improving the fracturing construction effect. The application has the advantages of reasonable design, clear method, simple and efficient operation, effective guidance for the segment plug type fracturing construction, reduction of the local blocking effect of the proppant, effective reduction of the sand plugging risk, improvement of the fracture forming efficiency, improvement of the segment fracture complexity, effective support of smaller scale cracks, facilitation of stable production after fracturing, obvious improvement of the fracturing construction effect, and greater economic benefits.

An augmented reality (AR)-assisted enhanced fracture reduction fixator includes a bidirectional telescopic rod and two connecting columns, a ball groove is provided in a middle part of each of the two connecting columns, a ball is rotatably connected to an inner wall of each of the two ball grooves, and the two balls are fixedly connected to a telescopic end of the bidirectional telescopic rod. A rectangular slider is slid to a suitable needle insertion position and angle, and a bone nail is inserted into proximal and distal ends of a fracture. Then, the rectangular slider is fixed by screwing. Based on different fracture sites of a patient, two fixing frame bodies need to adapt to the fracture sites of the patient, that is, an angle between the two fixing frame bodies will change. The ball rotates in the corresponding ball groove.