56results about "Material strength using tensile/compressive forces" patented technology

The invention discloses a laboratory model testing device for tunnel excavation. The laboratory model testing device comprises a model box, a tunnel structure model, a loading device and an excavation device, wherein the model box is composed of a floor trough and an organic glass plate, the organic glass plate is fixed on the opening surface of the floor trough through a groove; model testing fillers are padded in the model box; the tunnel structure model is made of rosin materials in a casting manner according to the ratio of similitude of an actual tunnel section, and is arranged in the middle of the model box; the loading device mainly comprises a counter-force beam, a steel plate and a hydraulic jack, and is arranged on the top of the model box; the excavation device mainly comprises a heating wire, a lead and a power supply switch, wherein the heating wire is arranged in the tunnel structure model. Due to the adoption of the testing device, the shape and size simulation in the tunnel excavation process can be performed conveniently, an excavation boundary can be well matched with a geometric boundary designed in advanced, the simulated tunnel excavation can be relatively well matched with an actual engineering; the testing device is simple in structure, convenient to operate, low in cost, and convenient to develop and apply.

The invention provides a concrete cracking overall process testing device based on a true environment. The device comprises a base, wherein an environmental box, a concrete sample containing device, a true environment simulation system and a loading system are arranged on the base; the environmental box is isolated from the surroundings; the concrete sample containing device is arranged in the environmental box and comprises a fixed chuck, a movable chuck and a sample middle fixed side formwork, the fixed chuck, the movable chuck and the sample middle fixed side formwork are spliced to form a concrete sample containing space, the fixed chuck is fixedly arranged in the environmental box, and the movable chuck is movably arranged; the environmental box and the concrete sample containing space are provided with temperature sensors; the true environment simulation system at least comprises a temperature regulation device which is arranged in the environmental box and the concrete sample containing device to simulate the set true environment at temperature; the loading system enables the movable chuck to be fixed or move in the axis direction, and a displacement/deformation sensor is arranged on the movable chuck to sense deformation of a concrete sample; a stress sensor is arranged to sense the load borne by the sample. The device can be used for testing the whole process of development of temperature, stress and other factors of concrete in a changeable environment from the test angle.

The invention discloses an anti-gas-channeling simulation test apparatus in a later stage of well cementation. The apparatus comprises a bearing rod, a cement sheath inner tube, a cement sheath outer tube and a shell which are arranged in order from inside to outside, wherein a first sealing cavity is formed between the bearing rod and the cement sheath inner tube; the inner cavity of the bearing rod is communicated with the first sealing cavity; the inner cavity of the bearing rod is communicated with a first connecting hole for injecting a medium; a second sealing cavity is formed between the cement sheath inner tube and the cement sheath outer tube; the second sealing cavity is communicated with a second connecting hole for injecting the medium; a third sealing cavity is formed between the cement sheath outer tube and the shell; and the third sealing cavity is communicated with a third connecting hole for injecting the medium. The apparatus can simulate the size of hardened cement paste in full-scale, simulate loading conditions of the hardened cement paste in all directions and study sealing completeness of the hardened cement paste, is convenient for taking specific measures to improve a cement slurry system, and is helpful for increasing the anti-gas-channeling performance in the later stage of the hardened cement paste, thereby increasing the quality of the well cementation.

The invention discloses equipment used for an air sac test. The equipment used for the air sac test comprises a base, an air sac test box body, a timer, a telescopic compression rod which can move up and down when driven by a first motor, a compression block arranged at the bottom end of the telescopic compression rod, multiple pressure sensors, a singlechip and a touch display, wherein the air sac test box body is arranged on the base and comprises a test box body and a box cover, a through hole through which the telescopic compression rod can penetrate is formed in the box cover, the box cover is movably arranged on the test box body, and an air sac air charging hole is formed in the bottom of the test box body; the timer is arranged outside the test box body; multiple pressure sensors are respectively arranged on the bottom surface of the compression block and the bottom surface of the test box body; a data transmission terminal of the touch display and a data transmission terminal of the timer are respectively connected with the singlechip, the input terminal of the singlechip is connected with each pressure sensor, and the output terminal of the singlechip is connected with the first motor. The equipment used for the air sac test can test sealing property of an air sac, also can test stiffness of the air sac and is high in test precision and easy to operate.

The invention relates to a fatigue performance testing device for a bolt bearing large load at a low temperature. The fatigue performance testing device comprises a cryogenic tank (1), guide columns (2), rotation shaft apparatuses (3), an upper loading pull rod (4), a test fixture (5), a cryogenic tank door (8), a liquid nitrogen inlet (9), a limit locking apparatus (10), a beam lifting apparatus (11), a loading apparatus (12), beams (13), a control panel (14), a displacement sensor (15), a nitrogen outlet (16), a base (17) and a lower loading pull rod (18). The fatigue performance testing device realizes test of the fatigue performance of bolt bearing the large load at the low temperature, can carry out low temperature dynamic low-cycle fatigue and programmed fatigue tests, and realizes fatigue performance parameter measurement and deformation behavior research when the bolt bears the large load at a condition close to a service environment. The fatigue performance testing device is simple in operations and has high practicability.

The invention discloses a horizontal biaxial tension testing machine and a tension testing method thereof. The machine comprises a main body structure (1), the main body structure is a machined large-caliber thick-walled steel tube, the peripheral surface of the main body structure is horizontally uniformly provided with hollow jacks (3), and every hollow jack is fixedly connected with the main body structure through a flange plate (2). Every hollow jack is sequentially connected with a pressure sensor (4), a hexagonal lock cap (5), a pull rod (6) and a combination jig to form a transmission system. The surfaces, connected with the flange plates, of the main body structure are processed planes. The combination jigs are connected to the pull rods and can linearly move with the pull rods. The combination jigs are used to clamp samples. The invention also provides a method for carrying out biaxial tension testing by using the horizontal biaxial tension testing machine. The horizontal biaxial tension testing machine has the advantages of compact structure, simple form, convenience in adjustment, stability in working, achieving of simultaneous and centrically centrosymmetric loading, and various test functions.

The invention discloses an underground cavern similarity simulation testing system, comprising a shell a sample bearing platform arranged in the shell, a temperature regulating and controlling system capable of changing the temperature value of a sample and a loading system used for applying load onto the sample at different temperature values. The temperature regulating and controlling system comprises a heating member arranged in the shell and used for heating the sample and a temperature sensor arranged in the shell and used for detecting the temperature of the sample. With the temperature regulating and controlling system, an underground cavern simulation sample can reach different temperature values; loading of the sample can be carried out at different temperature values, respectively; thus, the situation of load and deformation of the sample at different temperature values can be acquired. The underground cavern similarity simulation testing system can authentically simulate the characteristics of the load and deformation of surrounding rocks of tunnel excavation projects or other underground caverns under the influence of different temperatures, is capable of accurately reflecting actual situations and has good application prospects in testing of the deformation, load and the like of caverns.

The invention relates to the fields of indoor tests in geotechnical engineering and geological engineering, relates to a tester for the lateral expansibility of a soft rock, and especially relates toa tester and a test method for the lateral expansibility and the expansion deformation of the expansive soft rock in the engineering field. The main body structure of the tester includes a loading cap, a pressure bearing plate, dynamometers, pulleys, a sample loading chamber, a water permeable plate, a sliding protection tank, a proving ring, a dial gage, a pressure display instrument, a filter paper, a bearing bottom plate and a stationary block. The test method makes the lateral expansion deformation and the lateral expansibility of the expansive soft rock under the action of vertical load have a high consilience with onsite data of the engineering, is an accurate test method for knowing the mechanical performances of the expansive soft rock in the engineering, and provides a basis for the lateral deformation of the soft rock.

The invention discloses a large-burial-depth tunnel surrounding rock stabilization and support model test system under complex conditions. The system is composed of a high-pressure water sealing modeltest cabin, an embedded high-hydraulic servo loading system, a high crustal temperature regulation and control system, a high-permeability water pressure loading system, a micro TBM intelligent tunneling system, a multi-arm lining system and a self-sealing high-precision test system, wherein the high-pressure water sealing model test cabin is used for accommodating a test model body and a high-pressure water body, the embedded high-hydraulic servo loading system provides high crustal stress for the test model body, the high crustal temperature regulation and control system applies high crustal temperature to the test model body, the high-permeability water pressure loading system is used for carrying out omnibearing high-permeability water pressure loading of the test model body, the TBMintelligent tunneling system can intelligently excavate model caverns of different shapes and sizes, the multi-arm lining system is used for performing lining supporting and grouting reinforcement after the model caverns are excavated, and the self-sealing high-precision testing system is used for testing displacement, stress and osmotic pressure of any part in the model test body.

The invention belongs to the technical field of composite stress and strain measurement, and provides an out-of-surface strain measuring method based on digital image correlation. The out-of-surface strain measuring method comprises the steps of: firstly, conducting a text according to an experimental scheme, correlating a camera with a force sensor in order to ensure that a distance between a lens and a test piece remains unchanged, driving the camera and force sensor to move simultaneously, slowly loading the test piece, and pressing down a camera shutter at the same time, wherein the camerashutter is not loosened during the test process until the end of loading, and images and test data before and after deformation are obtained after the test ends; secondly, writing an algorithm for calculating and searching a position of a point after deformation, so as to obtain deformation information (displacement and strain) of the test piece, and performing bilinear interpolation to obtain astrain value of an arbitrary point of the test piece through dividing regions; and finally, acquiring a strain cloud chart of the test piece through setting shades of colors according to whether the strain value is plus or minus and the magnitude of the strain value. The out-of-surface strain measuring method is convenient to operate, can be applied to deformation measurement of complicated structures, improves the calculation efficiency and expands the applicable range.

The invention discloses a test device and a test method for testing performance of a fiber composite grid material. The test device comprises composite grid fixtures and a clamping device, wherein theclamping device comprises an upper oppositely pulling clamping device and a lower oppositely pulling clamping device; sliding slots 1 are formed in the upper oppositely pulling clamping device and the lower oppositely pulling clamping device; the composite grid fixtures are connected to the upper oppositely pulling clamping device and the lower oppositely pulling clamping device in a sliding manner through the sliding slots 1 respectively; the top end of the upper oppositely pulling clamping device and the bottom end of the lower oppositely pulling clamping device are connected to an upper cross beam and a lower cross beam of a universal testing machine in a clamping manner respectively; a standard component is arranged between the composite grid fixtures; the test device further comprises slidable steel plates and transverse rib fixing devices. Through the test device and the test method for testing the performance of the fiber composite grid material, provided by the invention, an overall oppositely pulling test of multiple ribs of a fiber composite grid can be completed, the strength of joints can be tested and influence of the joints on the strength of the composite grid material can be tested; not only the working efficiency is improved, but also the test device can be reused, and thus the cost is saved.

The invention discloses a tensile strength and break elongation test method of a PVC paste resin glove material. The test method comprises a test piece preparation step and a test piece test step, wherein the test piece preparation step comprises the following steps: (a) mixing raw materials; (b) performing constant-temperature water bath; and (c) forming a test piece. The tensile strength and break elongation test method of the PVC paste resin glove material substitutes a complicated process of a PVC paste resin glove production line, a high-temperature-resistant glass plate is used for substituting a hand mold to prepare the test piece in laboratory, the prepared test piece is similar to the performance of a PVC finished product glove, so that the experimental equipment is simplified, and the material cost and time cost are saved; and important technological instruction data can be provided for manufacturers for manufacturing PVC paste resin powder, and crucial guarantee is provided for improving the technology.

The invention provides an on-batch pressing testing device for touch control chips. The on-batch pressing testing device comprises a device body, wherein the device body comprises a base; the base isdivided into a positioning layer, a sucking layer and a control layer; the positioning layer, the sucking layer and the control layer are sequentially arranged from top to bottom; a plurality of positioning grooves are formed inside the positioning layer. According to the on-batch pressing testing device, touch control chips to be tested are solidly sucked into the positioning grooves, a piston isdriven by a cylinder to press down imitated fingers to the part above the chips to be tested, pressing action of human fingers is imitated, in the testing process, the force exerted to the surfaces of the chips to be tested from the fingers is kept unchanged when the driving parameters of the cylinder are changed, meanwhile, the situation that the chips to be tested are damaged because of too large pressing forces can be avoided, the on-batch pressing testing device is simple in debugging and good in consistency, the testing efficiency can be improved, great convenience can be brought to on-batch testing, and convenience can be brought to large-scale production and maintenance.

The invention discloses a tensile fixture and particularly relates to the technical field of fixtures. The tensile fixture comprises two clamp plates and is characterized in that the two clamp platesare in butt joint to clamp a to-be-stretched test piece, the butt joint surfaces of the two clamp plates are clamp faces, the vertical direction of each clamp face is provided with an arc-face groovewhich penetrates the corresponding clamp plate, a plurality of clamp grooves are arranged in the surface of each arc-face groove along the axial direction of the arc-face groove, the clamp grooves arematched with protruding parts of the to-be-stretched reinforcing steel bar, and the surface of each clamp face is provided with a plurality of toothed structures. The tensile fixture is stable in test piece clamping, capable of avoiding test piece sliding off, capable of achieving accuracy measuring data and capable of being used for clamping different kinds of test pieces.

The invention belongs to a testing system and a testing method, and concretely relates to a low-temperature stretching testing system and a testing method. The testing system comprises an outer Dewar and an inner Dewar, a Dewar seal cover is arranged at the top, an external bile liquid conveying tube and an internal bile liquid conveying tube are arranged on the low-temperature stretching testing system, the external bile liquid conveying tube is communicated with the space between the outer Dewar and the inner Dewar, the internal bile liquid conveying tube is communicated with the space in the inner Dewar, an external bile liquid conveying tube control valve and a liquid conveying tube main valve are arranged on a pipeline of the external bile liquid conveying tube in order, the internal bile liquid conveying tube enables airtight communication with the liquid conveying tube main valve, an external bile liquid nitrogen exhaust pipe and an internal bile liquid nitrogen exhaust pipe are arranged on the low temperature stretching testing system, the external bile liquid nitrogen exhaust pipe is communicated with the space between the outer Dewar and the inner Dewar, the internal bile liquid nitrogen exhaust pipe is communicated to the space of the inner Dewar, an external bile liquid nitrogen exhaust pipe control exhaust valve and a low temperature exhaust main valve are arranged on the pipeline of the external bile liquid nitrogen exhaust pipe in order, and the internal bile liquid nitrogen exhaust pipe enables airtight communication to the low temperature exhaust main valve. The low-temperature stretching testing system and the testing method have the effects of high efficiency and saved cost.

The invention discloses a test device with convenient installation and unloading for testing the dynamic characteristics of a seismic isolation building structure. The device comprises a reaction force wall, a hydraulic jack, a quick disassembly assembly, an auxiliary disassembly assembly, a hydraulic jack support mechanism and a seismic isolation support assembly. The quick disassembly assembly includes a first unloading block and a second unloading block whose connecting ends are inclined surfaces fitted to each other. The hydraulic jack supporting mechanism includes a first supporting plate, a second supporting plate, a horizontal screw and a lifting and leveling assembly. The test device provided by the invention can quickly complete the unloading work of a seismic isolation building during an experiment, so that the seismic isolating building can generate and complete free vibration during an initial displacement test process, and the accuracy and operability of an experiment result are effectively improved. According to the hydraulic jack support mechanism of the device, different types of hydraulic jacks can be quickly installed, a certain degree of initial displacement is applied to the seismic isolation building by using the hydraulic jack, and human and financial resources are saved.

The invention discloses a method for analyzing the mechanical properties of 3D printing samples with different construction orientations, which comprises the following steps of manufacturing a plurality of test sample strips with different construction orientations by adopting 3D printing, and arranging speckles on the surfaces of the test sample strips, placing the test sample strip on a loadingdevice, and debugging the loading device, carrying out a mechanical property detection test, and collecting an image of the test sample strip in the whole test process, performing contrastive analysison the images before and after the deformation of the test sample strip by using a digital image correlation method to obtain pixel point displacement and strain information, according to the straininformation, acquiring a stress-strain curve to obtain performance parameters of the test sample strip, repeating the above steps to complete the mechanical property detection test of the test samplestrips with different construction orientations, and analyzing the difference of the mechanical properties of the test sample strips with different construction orientations.

The invention relates to a die structure for plate drawing and bulging performance experiments. The die structure comprises an upper die structure, a lower die structure, a force sensor I, a force sensor II and a displacement sensor; the upper die structure comprises an upper die base, a bulging die and a die plate insert; the lower die structure comprises a blank holder, a bottom plate, a bulgingmale die, a drawing male die and a lower die insert; the blank holder and the upper die base can move up and down relatively; the bulging male die extends out of the drawing male die to bulge a plate; the force sensor I is used for outputting bulging force during bulging of the plate in real time; the force sensor II outputs a counter-acting force of the plate to the drawing male die in real timeduring the drawing experiment; the displacement sensor outputs the displacement of the blank holder at the corresponding time; and the maximum height at which cracking does not occur when the plate is subjected to drawing and bulging experiments is obtained according to the time, force and displacement curve. According to the die structure for the plate drawing and bulging performance experiments, bulging and drawing experiments of plates with different plate materials and different plate material thicknesses are realized through one set of die structure, the experiment cost is reduced, and the experiment accuracy and efficiency are improved.

The invention discloses a welded joint creep deformation prediction method based on DIC technology. The method comprises the following steps of S1, processing a welded joint sample; s2, applying a constant loading stress level to the sample, and measuring axial strain field data of the sample at a plurality of discrete moments by using the DIC technology; s3, extracting creep axial strain values of a base material, a weld joint and a welding heat affected zone; s4, changing the loading stress level of the creep test, and repeating the steps S2-S3 to obtain a creep axial strain data pair; s5, constructing a material creep constitutive model, fitting the obtained creep axial strain data pair into the creep constitutive model, and respectively obtaining optimal estimations for creep constitutive model parameters of the base material, the weld joint and the welding heat affected zone; and S6, substituting the creep constitutive model parameters into the creep constitutive model, and predicting creep deformation of the base material, the weld joint and the welding heat affected zone of the welded joint under different stress levels. The method realizes simultaneous characterization andprediction of creep deformation of different areas of a real welding joint.

The invention discloses a deep groove ball bearing stiffness testing device. A precision servo electric cylinder is suspended at the top of a vertical fixing plate; an output shaft of the precision servo electric cylinder is connected with the upper end of a pressure sensor; a loading screw is mounted at the bottom of the pressure sensor; a measuring plate is placed horizontally; a mounting end ofthe measuring plate sleeves the loading screw; a precision displacement sensor is arranged beside the pressure sensor; a measuring head of the precision displacement sensor is in contact with the topsurface of a suspended end of the measuring plate; a supporting shaft is arranged below the measuring plate; the two ends of the supporting shaft are supported by two V-shaped modelblocks respectively; the bottom of each V-shaped block is fixed on a bottom plate through a connecting plate. The testing device disclosed by the invention simulates the loading working condition of an actual vehicle,and can provide guidance data for product optimization, through deep groove ball bearing stiffness test and data analysis. The device disclosed by the invention has the advantages of simple structure,easiness in implementation, convenience in testing operation and accurate and reliable testing result, and is applicable to the stiffness test of various types of deep groove ball bearings, and has strong universality.

The invention provides a rock gas breakthrough pressure measuring device suitable for high-temperature and high-pressure conditions, which is mainly characterized in that a high-temperature and high-pressure resistant bubble monitor consisting of a sapphire window is additionally arranged at the rear end of a rock core holder, so that the problem that an infrared bubble detector is not resistant to temperature and pressure is solved. A back pressure system is additionally arranged behind the bubble detector, so that the boiling point of the liquid in the bubble detection device can be improved, and the liquid is prevented from boiling and evaporating. The rock core rear pipeline is connected with a vacuum pump and is used for removing residual bubbles in the pipeline at the outlet end of the rock core holder due to the sample dismounting and mounting process. The outlet end of the rock core holder is connected with a pressure supplementing system to ensure that the rear-end pipeline pressure of the rock core is consistent with the pressure of the back-pressure valve; and meanwhile, all links of the experiment can be controlled in an omnibearing mode, real-time tracking and automatic recognition are achieved, and the experiment efficiency is improved. The high-temperature and high-pressure simulation experiment can simulate geological conditions, wherein the measured data is ofgreat significance to cover layer evaluation under the geological conditions.

The invention discloses a small artificial bionic blood vessel perfusion fluid pressure testing system and method. The testing system comprises a liquid storage tank, a perfusion bioreactor and the like, a tested artificial bionic blood vessel is arranged in the perfusion bioreactor, and two ends of the tested artificial bionic blood vessel are respectively connected with Luer taper through metaldispensing needles; a water suction port of a self-priming pump communicates with a liquid storage bottle, a water outlet of the self-priming pump is divided into two paths through a first ball valve,one path communicates with the liquid storage tank through a first pressure transmitter, the other path communicates with the Luer taper at one end of the tested artificial bionic blood vessel through a second ball valve, and the Luer taper at the other end of the tested artificial bionic blood vessel communicates with the liquid storage tank through a second pressure transmitter and a third ballvalve. According to the testing method, liquid pressure is set for the testing system to serve as a testing pressure, the tested artificial bionic blood vessel is connected into the system, it is tested whether the artificial bionic blood vessel can be kept complete or not under the set pressure, the phenomena of damage, leakage and the like, the testing system is small in size, and the testing method and operation are simple.

The invention relates to the field of numerical control machine tools, in particular to a heating tensile test device for numerically-controlled machine tool spindle environment reliability test. Theheating tensile test device comprises a box body; a partition plate is arranged in the middle inside the box body; the left end and the right end of the partition plate are connected with the box bodythrough rotating shafts; the partition plate divides the box body into a test cavity and a cooling cavity; a plurality of heaters are arranged at the upper end of the interior of the test cavity; test mechanisms are symmetrically arranged on the upper side and the lower side of the partition plate; a draught fan is arranged at the right end of the box body; an air inflow pipe is arranged on the draught fan; a refrigeration mechanism is arranged on the air inflow pipe; an air blowing pipe extending into the cooling cavity is arranged on the draught fan; a plurality of spray heads are arrangedon the air blowing pipe; and an exhaust pipe is arranged at the left end of the cooling cavity. Due to the structural arrangement of the device, heat in the test cavity cannot be lost too much, energyloss is reduced, the working efficiency is improved, a spindle is convenient to replace, the replacement safety is improved, and the practicability is high.

A device used for measuring vertical intensity of corrugated fin plate on heat exchanger under horizontal-loading is prepared as fixing piezoelectric transducer of 3-phase dynamic meter on operation table of digital controlled miller, connecting said transducer to charge amplifier and computer with A/D collection card through signal line, fixing mould on mould fixing table being fixed on platform of said transducer, fastening test-piece fixing case on cutter handle of 3-shaft digital controlled miller and locking rotary freedom of cutter handle on 3-shaft digital controlled miller.