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1748results about "Material strength using steady shearing forces" patented technology

Compact sandstone reservoir complex netted fracture prediction method

The invention belongs to the petroleum exploration field, and concretely relates to a compact sandstone reservoir complex netted fracture prediction method. The method comprises the steps of: building a geological structure model and a fracture growth model; testing magnitudes and directions of ancient and modern crustal stresses; completing a rock mechanic parameter experiment; testing rock mechanic parameters and fracture stress sensitivities; developing a fracture rock multistage composite rupture criterion; performing a rock deformation physical test to obtain a peak value intensity; building a relation model between single axle state stress-strain and fracture bulk density; building a relation model between triaxial state stress-strain and fracture bulk density and occurrence; building a relation model between single axle state stress-strain and fracture bulk density; calculating and stimulating fracture parameters under modern conditions; and verifying the reliability of a fracture quantitative prediction result. The method can accurately obtain compact sandstone reservoir complex netted fracture parameters, and perform quantitative characterization, is suitable for quantitative prediction of any fracture mainly with a brittle reservoir, and reduces exploitation risks and costs.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)

Interface device and method for interfacing instruments to vascular access simulation systems

An interface device and method for interfacing instruments to a vascular access simulation system serve to interface peripherals in the form of mock or actual medical instruments to the simulation system to enable simulation of medical procedures. The interface device includes a catheter unit assembly for receiving a catheter needle assembly, and a skin traction mechanism to simulate placing skin in traction or manipulating other anatomical sites for performing a medical procedure. The catheter needle assembly and skin traction mechanism are manipulated by a user during a medical procedure. The catheter unit assembly includes a base, a housing, a bearing assembly and a shaft that receives the catheter needle assembly. The bearing assembly enables translation of the catheter needle assembly, and includes bearings that enable the shaft to translate in accordance with manipulation of the catheter needle assembly. The shaft typically includes an encoder to measure translational motion of a needle of the catheter needle assembly, while the interface device further includes encoders to measure manipulation of the catheter needle assembly in various degrees of freedom (e.g., translation, pitch and yaw) and the skin traction mechanism. Alternatively, the shaft may include an additional encoder to measure translational motion of an instrument inserted through the catheter needle assembly. The simulation system receives measurements from the interface device encoders and updates the simulation and display, while providing control signals to the force feedback device to enable application of force feedback to the catheter needle assembly.
Owner:IMMERSION MEDICAL

Nonlinear System Identification Techniques and Devices for Discovering Dynamic and Static Tissue Properties

ActiveUS20110054354A1Quickly mechanical propertyDiagnostics using suctionDiagnostics using pressureAccelerometerEngineering
A device for measuring a mechanical property of a tissue includes a probe configured to perturb the tissue with movement relative to a surface of the tissue, an actuator coupled to the probe to move the probe, a detector configured to measure a response of the tissue to the perturbation, and a controller coupled to the actuator and the detector. The controller drives the actuator using a stochastic sequence and determines the mechanical property of the tissue using the measured response received from the detector. The probe can be coupled to the tissue surface. The device can include a reference surface configured to contact the tissue surface. The probe may include a set of interchangeable heads, the set including a head for lateral movement of the probe and a head for perpendicular movement of the probe. The perturbation can include extension of the tissue with the probe or sliding the probe across the tissue surface and may also include indentation of the tissue with the probe. In some embodiments, the actuator includes a Lorentz force linear actuator. The mechanical property may be determined using non-linear stochastic system identification. The mechanical property may be indicative of, for example, tissue compliance and tissue elasticity. The device can further include a handle for manual application of the probe to the surface of the tissue and may include an accelerometer detecting an orientation of the probe. The device can be used to test skin tissue of an animal, plant tissue, such as fruit and vegetables, or any other biological tissue.
Owner:MASSACHUSETTS INST OF TECH

Multifunctional tilt table device used for testing interfacial shear strength characteristics of geotechnical synthetic material

The invention discloses a multifunctional tilt table device used for testing the interfacial shear strength characteristics of a geotechnical synthetic material. The multifunctional tilt table device comprises a testing stand, an inclined plane control mechanism, a shearing box unit, a vertical loading mechanism and a measurement and control system, wherein the inclined plane control mechanism drives a tilted plate of the testing stand through a motor so as to allow the tilted plate to rotate to any inclination angle and can fix the tilted plate at a certain inclination angle through hydraulic jacks, shearing boxes are placed on concave guide rails on the surface of the tilted plate, a geotechnical synthetic material sample is installed between upper and lower shearing boxes, multiple layers of inclined shearing interfaces are formed through rotation of the tilted plate, the vertical loading mechanism comprises two loading devices used for short-term and long-term characteristic testing of the interfaces, the measurement and control system composed of a sensor, a control and acquisition system and a computer carries out real-time monitoring on stress and displacement of the upper and lower shearing boxes and the sample, determines a critical interface instability inclination angle according to displacement and pull-up curve abrupt change points and calculates shear strength of each interface according to stress analysis. The multifunctional tilt table device can be used for short-term and long-term characteristic testing of a single layer or multiple layers of interfaces.
Owner:HOHAI UNIV

Material mechanical property in-situ testing system and method in dynamic and static load spectrum

The invention relates to a material mechanical property in-situ testing system and method in a dynamic and static load spectrum, and belongs to the field of mechanical tests. The system integrates the following functions: a static testing function of biaxial drawing and shearing in an orthogonal plane, a shearing static testing function, a double shaft pull-pull mode fatigue testing function, and a static/dynamic press testing function. A complicated static/dynamic load spectrum can be established. Multi-mode composite load mechanical property evaluation can be performed on a film material or a block material, for example: high-cycle fatigue tests based on double-shaft pre-stretching load and impact press tests based on double-shaft stretching-shearing pre-load. At the same time, special defects are pre-fabricated on the central area and cross shaped arm area of a test piece; the analysis functions of a variable-zoom optical imaging system or a digital speckle strain analysis system can be utilized; the provided system and method can also be used to research the deformation behavior and cracking expansion rules of micro defects in a component under a multi-dimensional stress, and an evaluation tool is provided for performance degradation rules of products and optimized preparation method of materials.
Owner:JILIN UNIV

Microcomputer-controlled electro-hydraulic servo rock tri-axial dynamic shear-seepage coupling multifunctional test method

A microcomputer-controlled electro-hydraulic servo rock tri-axial dynamic shear-seepage coupling multifunctional test method belongs to the technical fields of rock mechanics and engineering technology and is characterized in that a test apparatus is composed of a loading system, a sealing system, a multiphase fluid injection system, an acoustic emission monitoring system, a deformation monitoringsystem and a data collection system. The test method not only solves technical problems that a tri-axial pressure chamber cannot be used for performing large displacement shear-seepage coupling of rocks under high confining pressure and high seepage pressure, and also can achieve various extended functions on the basis of the technology. The apparatus can achieve servo control loading of force, displacement and strain rate in shear direction and injection seepage of a multiphase fluid during dynamic shear. In addition, the apparatus is equipped with a temperature control system for performingconstant temperature control to the tri-axial pressure chamber at 0-200 DEG C; therefore, a series of extended experiments of dynamic shear-seepage coupling features of rocks under effect of temperature can be carried out.
Owner:TAIYUAN UNIV OF TECH

Earth-structure interaction contact surface shearing test visualization device

InactiveCN101846606ARealize a full range of observationAchieve distortionMaterial strength using steady shearing forcesData acquisitionEngineering
The invention relates to an earth-structure interaction contact surface shearing test visualization device. The device mainly comprises an upper shear box (1), a lengthened lower shear box (2), a perspective window (3), a camera head (15), a connecting seat (16) and the like. The device shoots the shear band deformation and the earth grain change process in the whole shear test process by using the camera chain to acquire a series of shear band digital images at different time points and a whole-journey video, and provides references for quantitative analysis tests on the range, deformation and thickness of the earth-structure contact surface shear band. The invention has the characteristics of reasonable structure, convenient disassembly, high test load, large sample dimension, visualized shear test process, automatic data acquisition and the like, and ensures the rigidity of the shear box while realizing the overall visualized observation on the contact surface shear band. The invention can be widely used in contact surface mechanical parameter testing, and qualitative and quantitative analysis on the macroscopic and microscopic properties of the shear band under the earth-structure interaction in geotechnical engineering.
Owner:INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI

A test method for simulating the change of shear strength of dewatered soil in foundation pit

The invention relates to a test method for simulating the shear resistant strength change of foundation pit precipitation soil. The test method comprises the following steps of: firstly, preparing an original-shape soil sample by using a fret saw, a soil cutter, a soil cutting disk, and the like; secondly, carrying out exhausting and water injection on the sample in a vacuum tank to be saturated;thirdly, mounting a test sample in which a latex film is sleeved in a three-axle pressure chamber; fourthly, solidifying the test sample at two phases through a three-axle ambient pressure system, wherein the test sample is restored to be in a natural self-weight stress state of a soil body by using the first-time solidification and the stress state of the soil body subjected to precipitation is simulated by using secondary solidification; fifthly, carrying out an un-drained shear test on the test sample through an axial loading system; and sixthly, after the test is ended, closing a motor and a valve and detaching the test sample. According to the test method disclosed by the invention, the influence of the reduction for water content of the foundation pit precipitation soil, the increase of effective stress and soil solidification and compaction on the soil shear resistant stretch is considered so as to provide reference for accurately selecting shear resistant strength indexes of the foundation pit precipitation soil and further provide guarantee for designing and constructing deep foundation pits of soft soil water-rich stratum safely, economically and reasonably.
Owner:TONGJI UNIV

Test device capable of evenly applying axial compression load and shearing load

The invention belongs to the technical field of strength tests in aviation, and particularly relates to a test device capable of evenly applying an axial compression load and a shearing load. The test device comprises a shearing load applying component 1, an axial compression load applying component 2, a lower platform component 3 and a rib-adding flat plate component 4. According to the technology for independently loading the compression load and the shearing load, adopted by the device, the device not only is suitable for the flat plate, but also is suitable for a rib-adding flat plate. Furthermore, the test debugging of the single axial compression load and the single shearing load under the condition that the rib-adding flat plate is invariable in an installing posture can be realized, so that the reference can be provided for the analysis of the stress state of a lower wall plate under the joint action of the compression load and the shearing load. The device applies shearing force by the self-balance principle of a whole frame and a 'load balancer', so that the shearing force can be evenly applied, the axial rigidity of the rib-adding flat plate can not be enhanced due to an adopted segmental shearing reinforcement block, a compression load applying effect can not be influenced, and a 'side frame effect' can be avoided.
Owner:CHINA AIRPLANT STRENGTH RES INST

Indoor stretching-shearing testing device for anchor rod

The invention relates to an indoor stretching-shearing testing device for an anchor rod, belonging to the technical field of geotechnical engineering. The device comprises a counterforce frame, a horizontal loading system, a lower shearing box, a vertical loading system, a horizontal guide rail system, an upper shearing box and a limit device. Due to the structure design of the horizontal guide rail system, the shearing movement of the upper shearing box along the horizontal loading direction is realized and a friction resistance in a shearing process can be effectively reduced. A first vertical loading jack and a second vertical loading jack in the vertical loading system are connected with the same hydraulic control system, thus a test anchor rod can always bear a vertically upward axial stretching force in the vertical loading process. By the indoor stretching-shearing testing device for an anchor rod, a shearing damage test of the anchor rod under different axial drawing forces can be realized and the defect that a conventional indoor stretching-shearing testing device for an anchor rod is only capable of performing a pure-stretching test is overcome; and the indoor stretching-shearing testing device for an anchor rod is of great importance in acquiring stretching-shearing damage test data of the anchor rod and understanding a damage mechanism of the anchor rod under a stretching and shearing comprehensive function.
Owner:INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI

Rock mass structural surface shear test method and device

The invention discloses a rock mass structural surface shear test method, which comprises the following steps of firstly, cutting a rock mass test piece into a cuboid and marking a vertical axis line and a horizontal axis line; then adjusting an adjusting rod, fixing the rock mass test piece by a movable steel baffle, enabling the vertical axis line of the rock mass test piece to coincide with the vertical axis line of a normal loading mechanism, enabling the horizontal axis line of the rock mass test piece to coincide with the horizontal axis line of a shear loading mechanism, and enabling the structural surface of the rock mass test piece to be located above the movable steel baffle; carrying out grading force application on the rock mass test piece by the normal loading mechanism from the vertical direction, and carrying out grading force application on the rock mass test piece by the shear loading mechanism from the horizontal direction; receiving the force application data of the normal loading mechanism and the shear loading mechanism and the displacement values of a normal displacement sensor and a horizontal displacement sensor by a computer, and analyzing and calculating the data. The invention also provides a rock mass structural surface shear test device. According to the invention, the stress bearing condition of a rock mass in the reality can be simulated, and test data are accurate and reliable.
Owner:WUHAN UNIV OF TECH

Stacked ring type shear apparatus and method for testing composite liner material by same

InactiveCN101603903AJudgment of weaknessesClose to the actual situation on siteMaterial strength using steady shearing forcesRing typeEngineering
The invention provides a stacked ring type shear apparatus and a method for testing composite liner materials by the same. The main part of the stacked ring type shear apparatus comprises an upper shear box, a lower shear box as well as a stacked ring group between the lower shear box and the upper shear box, the lower shear box is connected with a horizontal hydraulic cylinder by a hydraulic connecting rod and the bottom of the lower shear box is fixedly connected with a rigid substrate, a roller is arranged between the rigid substrate and a frame pedestal, and the stacked ring lateral wall is contacted with the working end of a horizontal shift sensor. When using the apparatus to test, the composite liner materials to be tested are respectively placed in the lower shear box, the stacked rings or the upper shear box, the uppermost stacked ring or the upper shear box is fixed on the frame, and then the test process is started. The invention breaks the limit that only the shear interface can be fixed when a conventional test apparatus carries out indoor test on a sanitary landfill liner system, and meanwhile the shift of the weakest sliding surface in the sample between earthwork materials contact faces can be observed when testing differently applied vertical load.
Owner:HOHAI UNIV

Integrated style shear apparatus for rock structural plane and a shear experimental method for rock structural plane

An integrated style shear apparatus for rock structural plane comprises a frame system, a vertical loading system, a horizontal loading system, and a shearing system. Both the vertical loading system and the horizontal loading system are fixed on, and the shearing system is installed inside the frame system. The shearing system is used to prepare the sample of structural plane and actualize the shear test, the vertical loading system and the horizontal loading system are used to provide normal stress and shear stress for the shearing system respectively. The present invention also provides an experimental method by using the integrated style shear apparatus for rock structural plane, and steps of the method including: sample placement, sample adjustment, sample preparation, sample loading, instrument hookup, exerting normal stress, exerting horizontal stress, measurement and description of shear area, repeating experiment, and normal stress and shear stress calculation. The present invention can effectively reduce sample preparation error and experimental error, and can rapidly and accurately determine shear strength and deformation parameters of rock structural plane.
Owner:POWERCHINA HUADONG ENG COPORATION LTD

Large-scale multifunctional frozen soil-composition contact surface cycle direct shear apparatus and test operation method

The invention is a large multifunctional frozen soil-structure interface cyclic direct shear apparatus and a test operation method. The structure of the apparatus comprises a horizontal and vertical loading system, a horizontal and vertical displacement and a load sensor, a temperature control and refrigeration system, a temperature sensor, a data collecting and self-stabilizing system, a guide rail system, and a soil sample box and supports. The test operation method comprises the steps of: 1. Installing the interface steel of required roughness; 2. Applying normal boundary conditions to a soil sample; 3. Cooling the soil sample; and 4. When the temperature cools to a target temperature, performing a shearing to the frozen soil interface in a selected shearing speed, at the same time the date collecting system beginning to record the stress-strain relation of the frozen soil interface. The apparatus and the method are the advantageous in that: 1) accurate control of the interface temperature in the temperature range between 0 DEG C and -20 DGE C can be achieved; 2) three normal boundary conditions of constant stiffness, constant displacement and constant stress can be accurately applied; 3) interfaces of various roughness can be simulated; 4) two shear modes of cyclic shear and monotonic shear can be realized; and 5) the stress applying and displacement control are accurate.
Owner:NANJING FORESTRY UNIV

Full-automatic, digital and large frozen soil direct shear apparatus

InactiveCN102313673APrevent rustDigital display automatic control loading speedMaterial strength using steady shearing forcesFreeze thawingTemperature control
The invention which belongs to the field of civil engineering equipment relates to a full-automatic, digital and large frozen soil direct shear apparatus. The large frozen soil direct shear apparatus which comprises a shear box, a refrigeration system of an upper shear box, a refrigeration system of a lower shear box, a vertical servo loading and monitoring system, a horizontal servo loading and monitoring system, and a measurement and control system is to determine the shear strength of the freeze-thaw interface of the frozen soil or determine the shear strength of full frozen soil and full thawy soil. The size of a frozen soil sample in the embodiment of the invention is 305mm*305mm*200mm, static force and a layered compacting method are adopted to prepare remolded soil samples of different initial water contents and dry densities for shear tests; temperature control systems of the upper shear box and the lower shear box are adjusted to control the temperatures of soils in the shearboxes to guarantee the shear plane to be superposed with the freeze-thaw interface of the frozen soil sample. The direct shear apparatus of the present invention solves problems that the difficulty of testing the shear strength of the freeze-thaw interface is large, the shear tests of coarse grain soil are difficult and the like and provides reasonable design parameters for civil engineering and traffic engineering in cold or highly cold regions.
Owner:BEIJING JIAOTONG UNIV

Large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests

The invention discloses a large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests. The machine comprises a measuring and controlling unit (1), a hydraulic servo unit (2), a loading unit (3) and a soil sample preparing unit (4). The loading unit (3) comprises a Z-direction vertical loading frame, an X-direction horizontal loading frame and a Y-direction horizontal loading frame, the three frames are perpendicular to each other, and the three frames all have independent loading ability. The hydraulic servo unit (2) comprises an X-direction horizontal loading actuator (311), a Y-direction horizontal loading actuator (312) and a Z-direction vertical loading actuator (31). The measuring and controlling unit (1) is in separate communication connections with three electro-hydraulic servo loading cylinders of the hydraulic servo unit (2). The large bidirectional dynamic/static direct-shearing machine is used in coarse-grained soil shearing performance tests, coarse-grained soil shearing performance tests on reinforced contact interface and coarse-grained soil shearing performance tests on concrete interface under the dynamic/static loading effects of simulation traffic loading.
Owner:CENT SOUTH UNIV
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