Testing servo-mechanical machine for mechanical tests of material samples for tension, compression and bending

FIELD: machine engineering.

SUBSTANCE: machine comprises a two-zone loading device comprising a base and a fixed traverse rigidly connected to each other by two smooth columns, the movable traverse is moved by means of servo motor and two worm-screw transmissions forming the tensile and compression zones, a force sensor fixed to the movable traverse from the side of the compression zone, two grips for fixing test samples in the tension zone: the upper one fastened in fixed traverse by two hinged units in a position coaxial with the axis of force application to test sample, and the lower one coupled with movable traverse through a force sensor, two supports for compression testing are installed in the compression zone, a displacement sensor, and including a pumping unit including a low-pressure pump, a high-pressure pump, low-pressure and high-pressure safety valves, distributors for controlling closure and opening of grippers, gauges for recording pressure in the low and high pressure lines. During the tension test, the lower grip coupled with the movable traverse through the force sensor by the hinge assembly is set to a position coaxial with the axis of force application to the sample, and when the sample is destroyed, the hinge connecting the force sensor to the lower grip is opened for releasing the force sensor from dynamic action of the lower grip weight, which receives the body of the movable traverse through a damping gasket.

EFFECT: providing alignment of force application to the sample with minimal accompanying bending and increasing the reliability of the force sensor.

2 cl, 1 dwg

 



 

Same patents:

FIELD: testing equipment.

SUBSTANCE: use: for testing of true strength or stiffness of hard or ultrahard components, using acoustic emission. The substance of the invention consists in the fact that a testing device on the basis of acoustic emission comprises a tested sample including hard surface, an acoustic sensor, an indentor, connected with the hard surface, and a load. The load is applied to the indentor, which transfers load to the hard surface. The load is increased to peak load, maintained for a certain period of time and then reduced. The acoustic sensor is connected as capable of data transmission with the tested sample, and detects one or more acoustic events arising in the tested sample. The testing system on the basis of acoustic emission includes a data recording unit connected with the testing device. The data recording unit records data from the testing device. On the basis of received data they objectively determine sample stiffness, and according to stiffness the sample may be arranged in a certain order in respect to other samples.

EFFECT: increased accuracy of stiffness testing on the basis of acoustic emission.

28 cl, 23 dwg

FIELD: construction.

SUBSTANCE: samples of lock elements are exposed to cyclic load with water pressure with an interval between loading cycles of 0.05-0.1 s.

EFFECT: possibility of valid detection of work resource of a lock element in hydraulic cutting equipment due to realisation of the process as close as possible to actual conditions.

1 dwg, 1 tbl

FIELD: construction.

SUBSTANCE: place of maximum foundation settlement is pre-determined. In this place to the foundation surface at the height 50-60 cm from the base of foundation or above the first foundation ledge three resistance strain gages are sticked and their ohmic resistance R0 is measured. The resistance strain gages are isolated from environment, then above the resistance strain gages a bin is arranged, which is blown and dried, and again the resistance of the resistance strain gages R1 is measured. Then, into the bin a flat chamber designed as a circle segment is placed which is pre-greased with calibration epoxy, and the chamber is injected by oil up to the pressure, at which the ohmic resistance of the resistance strain gages will return from R1 to R0. Ground pressure of the basement q under the foundation base is determined by the oil pressure in the chamber by the formula. Also the pressure is monitored by values of resistance of the resistance strain gages R1 and R0 by the formula. After pressure measurement in the foundation the chamber remains in the bin for the further pressure monitoring in the base and foundation.

EFFECT: decrease of tension concentration in foundation, increase of residual bearing capacity of the foundation.

3 dwg

FIELD: physics.

SUBSTANCE: method comprises, at the initial phase, shifting the position of the press plate by a given value in steps through given equal time intervals; at each step, detecting acoustic emission flux, selecting separate acoustic events, determining the flux density of the acoustic emission; when flux acoustic emission intensity reaches a given value, reducing at each subsequent step the shift value of the position of the press plate, while maintaining the acoustic emission intensity at the given level; when the value of the stepwise shift of the position of the press plate reaches a minimum allowable value and when acoustic emission intensity exceeds a given value during each subsequent stepwise shift, increasing the time interval for shifting the position of the press plate; when acoustic emission intensity subsequently falls below the given value, reducing the time interval for shifting the position of the press plate to the value given at the initial phase.

EFFECT: more acoustic events during breakdown of rock grains detected when testing a sample.

3 cl, 4 dwg

FIELD: testing equipment.

SUBSTANCE: prismatic sample has a prism shape, longitudinal and transverse planes of symmetry, two side ledges, arranged longitudinally, at the ends of the prism - support surfaces, and in its central part - surface of loading with a transverse test load. The prismatic sample is additionally equipped with inclined support surfaces arranged on side longitudinal ledges of the prism and characterised by angles of inclination to the longitudinal plane of the prism symmetry 5…20°.

EFFECT: simplification and reduction of cost of prismatic sample testing process with concentrators of mechanical stresses in complex stressed condition, provision of necessary accuracy of modelling of a type of stressed-deformed condition of structure material in focus of its damage.

2 cl, 4 dwg

FIELD: testing equipment.

SUBSTANCE: centrifugal plant comprises a body, a shaft installed on it with a rotation drive, a hydraulic cylinder fixed on the shaft perpendicularly to its axis, a piston placed in the hydraulic cylinder, as well as a fixator of piston position in the hydraulic cylinder, a grip for connection with the sample end, fixed on the piston in the under-piston cavity, and a source of medium connected to the under-piston cavity of the hydraulic cylinder by means of an input hole in the hydraulic cylinder. The source of medium is made in the form of the second hydraulic cylinder with the piston and the stem, filled by the medium and connected to the inlet hole of the first hydraulic cylinder, and a mechanism of reciprocal movement of the stem, at the same time the medium is liquid or gas.

EFFECT: expansion of functional capabilities of a plant by testing both under permanent and cyclic volume or flat loading with uneven distribution of load and with displacement of a loading zone along length of the sample with provision of transitions from loading by stretching mass loads to loading by pressing mass loads and with adjustment of the value of zone of uneven load distribution spread along sample length in process of testing.

3 cl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to benches for testing solid-propellant rocket bodies for tightness. Proposed test bench comprises nozzle body simulator and unloader with different-diameter two pistons and cylinders. Smaller-diameter piston is fitted in cylinder arranged in larger-diameter piston with its cylinder is coupled via nozzle body simulator with body rear flange.

EFFECT: accelerated tests, lower costs.

4 dwg

FIELD: testing equipment.

SUBSTANCE: bench comprises a body, a lower support, nozzles, a loading mechanism. The body is a reduced mode of an investigated vessel with a nozzle unit made of a socket and a shell, and the loading mechanism is a pump connected to the nozzle of liquid supply via a piston hydraulic cylinder. The nozzle unit is equipped with three resistive strain sensors connected to a strain station and installed one onto the outer surface of the shell at the distance of 3-5 mm from a welded joint, the second one - on the inner surface of the nozzle, in the point of crossing of generating inner surfaces of the shell and the socket, and the third one - on the inner end of the nozzle. There are pressure gauges installed on the body and on the pump.

EFFECT: valid assessment of actual load of equipment, reduced error of strength and resource assessment of vessels and devices, direct testing of which is difficult or even impossible since they are in operation, and testing of their full-size structures has high labour intensiveness.

3 dwg

FIELD: machine building.

SUBSTANCE: axial notch of the specified length and depth is made on the tested pipe. The tested pipe is loaded with internal pressure providing the occurrence of a crack initiated with the above notch and its propagation in axial direction from the notch centre to the pipe ends. Movement of the crack front is controlled by means of magnetic field sensors connected to the measuring system, which is created by means of magnetic inductors. The above sensors and the magnetic inductors are installed on the tested pipe in pairs and symmetrically relative to the line passing through the above axial notch. The system includes a magnetising system including magnetic inductors, a measuring system containing magnetic field sensors connected to a recording device. In addition, magnetic field sensors are connected to the recording device by means of amplifiers-differentiators.

EFFECT: enlarging the possibilities and increasing quick action of measurement of dynamic parameters of the test pipes destruction.

8 cl, 1 dwg

FIELD: machine building.

SUBSTANCE: pair of teeth is chosen from batch of teeth. Teeth are heated up to soldering temperature at their erection in the housing of drilling diamond bit. Teeth are installed in the mandrel so that they are engaged with working surfaces; at that, contact surface area is normalised with mandrel geometry. Mandrel with teeth is arranged on the loading device equipped with loading value sensor. Teeth are compressed at fixed loading rate till working edge at least of one tooth is destructed and strength of diamond teeth is evaluated as per value of destructive load determined as per readings of loading value sensor. Device consists of mandrel with holes for installation of a pair of diamond teeth, loading device with loading value sensor with spherical support, which is equipped with peak detector. Holes are located in the mandrel so that the possibility of installation of teeth with fixed contact surface area of working edges can be provided. Mandrel is equipped with magnetic support, and height of mandrel is chosen so that one of the inserted teeth can protrude above the mandrel surface.

EFFECT: possibility of quick and objective assessment of strength of working surface of diamond teeth supplied to the assembly.

2 cl, 3 dwg

FIELD: mining industry.

SUBSTANCE: method includes performing compression tests according to system "cylindrical hollow sample - backfill material" in rigid matrices with different values of relation of height of backfill material, filling space between walls of rigid cylindrical matrix and sample, to sample height, which has relation of height to diameter no less than 2. sample is set in matrices in such a way, that its axis passes through matrix axis. Unified hardness passport is built in coordinates "horizontal stress - vertical stress" of rock sample. Tests of rock samples for sliding are additionally performed during compression with loads above limit of lengthy hardness of rock with construction of sliding curves in coordinates "load level - vertical deformations speed logarithm", after that rock samples in matrix are enveloped in backfill material and same tests are performed again. Relative reaction of backfill massif is determined from mathematical expression. Alignment chart is built for dependence of relative reaction of backfill material from relation of its height to height of rock sample for various levels of system load. Alignment chart is used to determine relative reaction of backfill massif during its long interaction with rocks, enveloping a mine.

EFFECT: higher reliability, higher trustworthiness, higher quality of control over processes of deformation and destruction of massifs.

5 dwg, 1 ex

FIELD: testing equipment.

SUBSTANCE: device has body made with possible filling by working substance, pressing ring, pressure source and device for measuring pressure. Body is made with possible hermetic holding by pressing ring of researched bio-substance sample, and also with possible immersion in working substance. As working substance, warm physiological solution is used.

EFFECT: simplified construction, improved reliability, improved comfort of using device for research.

2 dwg

FIELD: investigating or analyzing materials.

SUBSTANCE: method comprises determining basic mechanical and geometrical parameters of the object to be investigated (yield point, inner and outer diameters, wall thickness), basic parameters of fluid (flow rate, pressure and temperature at the inlet and outlet of the pipeline or vessel, angle of inflow, admixture concentration), and determining operation life of metal of pipeline or vessel body from the formula presented.

EFFECT: enhanced reliability.

FIELD: measuring technique.

SUBSTANCE: method comprises cutting the substrate out of the solid film without defects having higher deformation capability in comparison with the material to be tested. The thickness of the substrate material is determined from the formula proposed. The specimen is applied on the substrate and the stack obtained is set in the matrix and is clamped by means of the punch. The stack is loaded from the side of the substrate and the current pressure is recorded. The procedure is repeated for the substrate only. The strength characteristics of the material to be tested is determined from the formula presented.

EFFECT: expanded functional capabilities and reduced cost.

2 cl, 10 dwg

FIELD: testing engineering.

SUBSTANCE: method comprises setting plugs into the branch pipes of the article to be tested, producing locking force by means of passing current through the winding of the electromagnet, and providing the article to be pressure-tight during the testing. The winding of the electromagnet is set into the housing of the plug that plays a role of magnetic circuit for the electromagnet. The plug comprises housing and member for producing locking force made of electromagnet having winding and magnetic circuit. The winding of the electromagnet is made of a multi-turn toroid and is set in the hollow in the housing of the plug.

EFFECT: enhanced reliability.

6 cl, 2 dwg

FIELD: testing engineering.

SUBSTANCE: method comprises mounting the flat specimen along the ring contour in the joining-sealing device, maintaining the specimen at a given temperature in the chamber separated into pressure and working chamber by means of the joining-sealing device provided with the specimen, loading the specimen by the pressure of liquid or gas that is inert with respect to the material to be tested from the side of the pressure chamber, exposing the specimen to the corrosion fluid from the side of the working chamber, measuring time period it takes for the specimen to be distorted for given temperature and stress in the specimen and fluid pressure in the pressure chamber, and calculating the durability from the data obtained. The device for realization of the method is proposed.

EFFECT: enhanced reliability.

2 cl, 1 dwg

FIELD: test engineering.

SUBSTANCE: device consists of the 1) base plate and pivotally connected upper frame, between which the sample with strain gauge sensors is installed; 2) measuring device for force detecting, regulating valve and pressure gauge. Sample loading is carried out either with elastic loading element or with element driven by the gas fed by the compressor from the receiver (at that the regulating valve and pressure gauge are installed on the supply pipe) or driven by the fluid pumped by the pressure-regulated pump.

EFFECT: simplification of the device.

2 dwg

FIELD: mining engineering.

SUBSTANCE: invention relates to mining industry and can be used for determining a long-term strength limit of mine rocks by samples. A method determining a long-term strength of mine rocks is based on a regularity of changes in a damping time Δti of the acoustic emission at a gradually increasing loading of a sample. A mine rock sample is subjected to a graduated axial loading σ(t) in a uniform compression chamber at a constant lateral strain. The sample is kept at a specified known value of the axial stress on each loading phase until the parameters of the acoustic emission impulse flow are stable. Damping time Δti of acoustic emission activity NΣi is determined on each loading phase of the sample. Difference of duration Δti-Δti-1 of the acoustic emission damping time is determined for each of its following and preceding loading phase. When the specified difference value is positive, an axial stress value of the preceding phase is recorded which is taken for the long-term strength limit of mine rocks.

EFFECT: enhanced accuracy of determining a long-term strength limit of mine rocks.

2 dwg

FIELD: physics.

SUBSTANCE: invention can be used for thermal damage zone determination within fire seat search by detection of thermally damaged burnt electric wiring segments or other wires manufactured by cold strain within fire place. Thus diagnostic physical variable is wire bending force measured in various points. Zone of the greatest thermal damage is indicated by extremely low values of this parameter. Wire bending force is measured using device which consists of two levers - upper and lower - jointed with an axis. Wire sockets are provided on the end of upper lever. Lower lever contains strain gauge with sensitive element designed as rocking arm with down-rounded corners to prevent wire cutting.

EFFECT: detection of thermally damaged burnt electric wiring segments or other wires manufactured by cold strain with accuracy sufficient for examining using nondestructive method.

3 dwg

FIELD: testing equipment.

SUBSTANCE: group of inventions refers to mechanical load tests of pipe specimens (method, pipe specimen mechanical loading installation, use of method and device). Device includes at least one packer (P) located in specimen (ET) in test area (ZT) and having longitudinal dimension that exceeds length of this test zone (ZT) and including i) the first pressure creating device (C1), for local change of diametre at least of one first part of packer (P), for its being pressed down to internal surface of specimen (ET) at the level of test zone (ZT), ii) the second pressure creating device (C2) intended for applying the first chosen internal pressure to some part of inner surface located at the level of the second part of packer (P), and/or iii) the third pressure creating device (C3) for combined action at least with one overlapping element (B1, B2) attached to the specimen at some distance from the end of packer (P) in order to specify operating zone (ZA), for applying the second chosen internal pressure to the specimen (ET) at the level of the second chosen internal pressure at the level of operating zone (ZA). Group of tested specimens can represent various combinations of pipe connections.

EFFECT: development of an version for static installations in which jack and medium under pressure are used simultaneously.

48 cl, 8 dwg

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