328 results about "Radial stress" patented technology

Vaso-occlusive devices for occluding a body cavity include an internal element located within a lumen of the device. The internal element may include an active element configured to stiffen the coil in-situ made from a material that can expand to a desired size, thereby inducing a radial stress to the coil to stiffen the occlusive device. Alternatively, the active element is secured to two points on the occlusive device, and is made from a material that contracts, thereby inducing a compression to stiffen the device. The internal element may additionally include an agent carrier that comprises a bioactive material capable of eliciting a biological reaction after the device is placed in-situ. For example, the bioactive material can be a part of a composition of the agent carrier, absorbed by the agent carrier, or coated as a layer on the agent carrier.

Systems and methods for determining a formation property related to formation strength and stresses are disclosed. A method for determining a formation strength includes obtaining radial formation property measurements at different wellbore pressures; generating a radial stress profile based on a formation model; generating a radial stress function from the radial stress profile; and comparing the radial formation property measurements with the radial stress function to determine the formation strength. A method for determining a formation stress profile includes deriving formation parameters from a formation radial profiling; obtaining formation log data that comprise formation density data; estimating formation stresses from the formation log data; and deriving a radial stress profile based on a formation model, the derived formation parameters, and the estimated formation stresses.

A set of supports are advantageously disposed on a top plate having a polishing surface useful for polishing workpieces, thereby applying substantially uniform pressure to the top plate. In a preferred embodiment, the supports are non-isosceles triangular elements distributed evenly at 45 degree increments around a ring-shaped top plate. This structure effectively compensates for radial stress variations arising from non-optimum positioning of support points with respect to the inner and outer diameters of the polishing surface.

A stent for implantation in a body lumen for protecting from rupture a fibrous cap in order to treat vulnerable plaque. One embodiment of the stent includes inclined planar rings joined by interconnecting links. The planar rings are inclined relative to a plane perpendicular to a longitudinal axis extending the length of the stent. The inclined planar rings provide vessel support yet require lower balloon pressures to deploy and exert lower radial stresses so that when appositioned with vulnerable plaque are less likely to rupture the fibrous cap.

Apparatus for providing an enclosure, for example as a housing or to provide buoyancy, at underwater locations is disclosed comprising an inner shell and an outer shell, with a structural filler disposed between the two. The shells are prepared from fibre-reinforced plastic, with the fibres being oriented to provide resistance to both longitudinal and radial stresses induced in the apparatus by the hydrostatic pressure. The filler may be a structural filler comprising structural members extending between the inner and outer shells and occupying less than 60% of the volume of the cavity between the two shells. Alternatively, the filler may be a substantially void-free structural filler, such as a polyester resin. Methods of fabricating the apparatus are disclosed. In addition, a method of deballasting a buoyancy module is disclosed, in which the ballast, for example water, is withdrawn from the module by means of reduced pressure. Apparatus for deballasting is also disclosed.

The invention belongs to the field of machining process and discloses a method for manufacturing a large elastic obturating piston ring. The method comprises the following steps: (1), turning the outer diameter, inner diameter and thickness of the product through a lathe; (2), drilling a process compression hole through a drilling machine; (3), performing semi-finish turning to the thickness through the lathe; (4), conducting heat treatment; (5), grinding the thickness plane through a grinding machine; (6), cutting an inner circle, an outer circle and an opening through a linear cutting machine; (7), performing external grinding through the grinding machine; and (8), grinding an inner hole through the grinding machine. The invention has the benefits that the method for manufacturing the large elastic obturating piston ring with the pressure-equalizing radial sealing ring structure is devised; the deformation law of roughly machining the contour under the state without radial stress and the influence to the profile tolerance and the opening dimension of the piston ring during the process of finely machining the inner circle and the outer circle under the radial stress state are discovered; the difficult process problems that the structure rigidity of parts is poor, the machining deformation is easily caused, and the machining accuracy of the parts is affected are solved; and the method fills the gap in China.

The invention provides a joint bearing low-temperature wear test system. The system comprises a base, a temperature box, a radial stress subsystem, a power subsystem, a temperature control subsystem, a wear measurement subsystem and a clamp subsystem. The clamp subsystem comprises a pushing block, a loading plate, an accompanying test bearing seat, a mandrel, an accompanying test bearing, an end cover and a locking part, which are independent detachable parts; the mandrel, the pushing block or the loading plate can be replaced to realize clamping in a life test of joint bearings with different diameters, so that the utilization rate and the universality of a test clamp are improved; and in addition, the clamp subsystem adopts the structural design improvement that a single-side flange is added to an inner hole of the loading plate, the thickness of the pushing block is reduced, the flange and the end cover cooperatively fix the accompanying test bearing, and the like, so that the mandrel deformation or breakage easily caused in the joint bearing wear test process is effectively avoided.

The invention relates to a spatial flexible filter supporting mechanism, which comprises a mirror seat and at least three flexible supporting pieces, wherein each flexible supporting piece consists of a fixed end, an axial stress unloading part, a radial stress unloading part and an adhesive boss; the fixed ends are connected with the mirror seat through screws; the axial stress unloading parts are positioned between the fixed ends and the radial stress unloading parts; the adhesive bosses are arranged at the ends of the radial stress unloading parts; the part of the filter, which is close to the rim, is adhered with the adhesive bosses through adhesives; and the gravity of the filter is positioned in a polygon consisting of the adhesive bosses. The structural stress resistance and the thermal stress resistance of the filter supporting mechanism are improved; due to the flexible shock absorption function, the filter supporting structure can resist the impact shock at a rocket launch section, and can be used in the fields of designing aerospace and aviation filter supporting structures, designing structures of optical active supporting mirrors, designing structural shock absorption and the like.

A vascular prosthesis tester (10) for inducing stresses upon a vascular prosthesis (22) having a channel extending through the vascular prosthesis is disclosed. The tester includes a pump (18) adaptable to pressurize a fluid disposed within the channel to induce a radial stress upon the vascular prosthesis. The tester may further include a bend applicator (16) operable to induce a bending stress, a torque applicator (12) operable to induce a torque, a linear force applicator (52) operable to induce a linear force, and/or a stop (28) for inducing a lateral push stress upon the vascular prosthesis. A method of fatigue testing a vascular prosthesis contained within a fluid conduit is also disclosed. The method includes injecting a fluid within the inner channel and inducing a torque, bending stress, linear stress, and/or later push stress upon the vascular prosthesis.

Method and apparatus are provided for cementing wells and preventing fluid entry into the wellbore before the cement cures and increasing radial stress in the cured cement. Impacts or vibrations are applied to the casing during the time that the cement is curing. The source or sources of the impacts or vibration are placed in the casing during displacement of the cement slurry or soon after placement and are mechanically coupled to the inside wall of the casing. The sources may later be withdrawn from the casing or expendable sources may be used.

The invention discloses a seepage experiment system for gas-containing coal under the action of an impact load. The system comprises a coal sample fixing device, an impact load applying device as well as a high-pressure gas source device, an axial pressure loading device, a confining pressure loading device, a vacuumizing device and a metering and data acquisition device connected with the coal sample fixing device, wherein the impact load applying device is a split Hopkinson pressure bar device. The split Hopkinson pressure bar device is adopted to apply the impact load for simulating rock burst, three-dimensional loaded conditions of coal-rock masses in coal mine can be simulated by applying different axial stresses and radial stresses, and seepage experiment of a coal sample in a three-dimensional stress state under the action of the impact load is successfully carried out, so that the system has relatively important meaning in both theory and practice.

The invention provides a determination method and a determination apparatus for the coefficient of earth pressure at rest, belonging to coefficient measuring methods and apparatuses for soil tests. In a conventional triaxial pressure chamber, an axial deformation constrained radial loading test is carried out on a soil sample so as to obtain a ratio of axial stress to radial stress; according to a two-dimensional asymptotic state criterion, relationship between a starting friction angle and a triaxial compression friction angle in the axial deformation constrained radial loading test satisfies equation I described in the specification, and relationship between the starting friction angle and the triaxial compression friction angle in a radial deformation constrained axial loading test satisfies equation II described in the specification. According to calculation results, the coefficient of earth pressure at rest in the axial deformation constraint radial loading test is 0.5 time of the ratio of axial stress to radial stress in the axial deformation constraint radial loading test. According to the method, errors generated when fixed section radial deformation control is used to substitute radial deformation control in a vertical direction of the soil sample in the radial deformation constrained axial loading test for the coefficient of earth pressure at rest can be avoided, and the method and the apparatus are suitable for accurate determination of coefficients of earth pressure at rest of saturated sand.

The invention discloses a device and method for measuring engine valve landing radial deflection. The engine valve landing radial deflection is measured, static calibration is carried out firstly, and then landing of a valve is simulated to calculate the radial deflection of the valve. When a calibration test is carried out, strain foil is pasted on the neck of the valve, and a bridge box, a strain gage and an upper computer are connected. The valve and a valve spring are assembled on an air cylinder cover. Then, the air cylinder cover is fixed to a rack, and a lead screw lift abuts against the tail end of the valve to provide a stroke for the valve. Finally, a dial indicator abuts against the side end of the valve. Only the simple test device is needed, radial stress is exerted to the engine valve, the relation curve of voltages and the deflection is worked out according to data analysis, the voltage value of the strain foil is obtained at last through the valve free landing test, therefore, the deflection of the landing of the valve is calculated, the valve landing radial deflection is calculated, and test requirements are met.

The invention relates to a high-energy-storage flywheel rotor and a manufacturing method thereof. The flywheel rotor is composed of a metal hub and a composite material rim. The metal hub is made of a high strength alloy steel material and is formed in an inblock cast mode. The rim includes three fiber reinforced composite material rings which sequentially sleeve the hub in an interference assembly mode. The three fiber reinforced composite material rings are formed through a wet method winding process, and a gradation winding curing process and a tension decreasing winding process are adopted in the manufacturing process. By means of the three-layer structure obtained through tension winding and interference fit assembly, the radial stress distribution of a flywheel is changed, prestress is generated among the layers, and the flywheel is not delaminated or loosed even under high rotating speed. The problem that high rotating speed flywheel use cannot be met by metal flywheel strength, low energy storage efficiency and the like is solved, and the flywheel use safety and reliability are greatly improved.

The invention discloses a device and a method for measuring radial stress of a transformer winding. The device comprises a first optical fiber splice, a first glass fiber tape, a first fiber bragg grating strain sensor, a first optical fiber coupler, a first internal connection optical fiber, a first external connection optical fiber, a fiber bragg grating interrogator and a computer, wherein the first glass fiber tape is glued on transformer coil winding surface insulation paper; the first fiber bragg grating strain sensor is fixed on the first glass fiber tape; an input end of the first optical fiber coupler is connected with an output end of the first fiber bragg grating strain sensor; one end of the first internal connection optical fiber is connected with an output end of the first optical fiber coupler; the first external connection optical fiber is connected with the other end of the first internal connecting optical fiber; the fiber bragg grating interrogator is connected with the first external connection optical fiber; the computer is connected with the fiber bragg grating interrogator; and the first internal connection optical fiber is connected with the first external connection optical fiber through the first optical fiber splice. According to the device and the method, accurate and effective winding radial stress measuring data are provided for research of anti-short-circuit capacity of a transformer and diagnosis of deformation of the transformer winding.

The invention provides an internal expansion tool for mechanical processing, and belongs to the technical field of devices for mechanical processing. The internal expansion tool comprises an expansion tool main body, a mandrel and a nut, wherein the expansion tool main body comprises at least three blades which can be combined to form a cylindrical structure of which the periphery is matched with an internal circumference of a part to be processed; the mandrel is coaxial with the expansion tool main body and is arranged in the expansion tool main body, and the extending end of the mandrel is fixed through the nut; the axes at the two ends of the mandrel are top-arranged on a machine tool. The internal expansion tool is large in contact area on the internal wall, the clamping force is uniformly distributed, and the milling and grinding radial stress and deformation based on clamping stress are reduced, so that the roundness is ensured. An internal hole and an external circle of the expansion tool main body are ensured to achieve the coaxiality. The end surface of the part can be synchronously milled and grinded, so that the verticality of the end surfaces can be ensured. The internal expansion tool is applicable to processing thin-wall tubular parts and step-mouth tubular parts.

A sealing assembly (1a, 1b) including: a first annular shield (10) presenting a sleeve portion (11) and a flange portion (12) which extends radially from a first end (13) of the sleeve portion; and a sealing member (15) made of elastomeric material presenting an annular root portion (16) which extends radially and overhangingly from a peripheral edge (18) of the flange portion and a first axial annular sealing lip (20) in which the sealing member presents a second radial annular sealing lip (21), the lips (20, 21) axially and overhangingly extending from the opposite side of the first end of the sleeve portion, on a same side as a thinned end (23) of the root portion and being reciprocally spread to form a radial V-shaped section having vertex facing the root portion and axis parallel to the sleeve portion; the first lip presenting a radial seat (32) facing the opposite side of the second lip and accommodating a toroidal spring (33) applying an offset radial stress to an elastic hinge defined by the thinned end of the root portion, —the sealing lips may be coupled to a second and a third annular shields selectively arrangeable coaxial to the first shield (50,50′) and having similar dimensions.

A method of assembling a member made of a first material in a part made of a second material having no plastic domain, includes forming the part with an aperture, inserting a radially flared portion of the member into the aperture, without any stress, and elastically and plastically deforming the flared portion of the member in the aperture by moving two tools towards each other axially, respectively on the top and bottom parts of the flared portion, so as to exert a radial stress against the wall of the part surrounding the aperture, causing the elastic deformation of the part, to secure the assembly in a manner that is not destructive for said part. The member can be a timepiece.

A method and apparatus for consolidating a formation penetrated by a wellbore utilize radial stress. The radial stress is created by loading the wellbore, wellbore casing or production pipe with preferably round, dense bead like materials. The shape and density of the bead like material transfers the axial direction of stress created by the vertical height of the bead like materials to a radial direction. The radial stress can also be generated by inflating an inflatable device. The radially directed stress can compact the geologic formation. This can include compaction of loose sand which otherwise may enter the production flow of hydrocarbon. The bead like materials can also support the wellbore casing or production piping from point loading. This can include point loading created by the movement of salt or other subterranean formations. The bead like materials can include barite, hematite, iron oxide, ilmenite, metal, alloy and combinations thereof.

The invention relates to a lead screw feeding platform with a loading assistant support, which is characterized in that a motor drives a lead screw, two ends of the lead screw are fixedly supported by a bearing; the lead screw and a workbench driving nut form a rolling spiral kinematic pair; the workbench driving nut is provided with a workbench; the bottom end of the workbench is provided with aguide rail; a loading assistant support device is arranged between two bearing supporting devices; the loading assistant support device comprises assistant driving nuts respectively arranged on two sides of the workbench driving nut; two assistant driving nuts are connected with the lead screw; each assistant driving nut is respectively fixedly connected with a slide block; the lower parts of thetwo slide block form a moving pair with the assistant supporting guide rail; and two slide blocks are respectively provided with a pressure sensor. In the lead screw feeding platform, real-time loading can be realized by the loading assistant support, the radial stress situation of the lead screw can be detected to reflect the nonparallelism of the vertical direction of the guide rail to effectively inhibit the flexural deformation of the lead screw due to radial stress, thus, the lead screw feeding platform can be widely applied to the horizontal large-route high-speed feeding platform of a machine tool lead screw.