729 results about "Compression test" patented technology

An in-plane shear and multi-axial tension or compression testing apparatus having four-bar linkages pivotable to two sleeves on an opposite vertices with the sleeves of each vertex rotationally attached to each other. Lateral links of each linkage are pivotally attached to load transfer plates in which the plates secure a test specimen. Each linkage is rotatable to the other linkages while the vertices are subjected to a compression or tensile load. The vertices are also capable of rotation by a testing machine for shear testing. During compression or tension of the vertices of the apparatus, the plates respectfully move toward or away from each other thereby applying compression or tension to the specimen. The bars of one linkage can be rotated with respect to the other, thereby applying torsional loading to the specimen.

The high-durability flexible polyurethane cold cure molded foam of the invention has an overall density of not less than 35 kg / m3 and not more than 45 kg / m3 and a wet heat compression set of not more than 15%, and preferably has a hardness change ratio, as determined in a repeated compression test, of not more than 15%. This foam can be obtained by the process of the invention. The process of the invention is a process for producing a flexible polyurethane cold cure molded foam obtained from a polyol and / or a polymer polyol containing dispersed polymer microparticles obtained by radical polymerizing a compound having an unsaturated bond in the polyol, water, a catalyst and a polyisocyanate, wherein the polyol is a polyol synthesized by the use of a catalyst containing at least one compound selected from the group consisting of a compound having a nitrogen-phosphorus double bond, cesium hydroxide and rubidium hydroxide. The foam of the invention has a low density and is excellent in durability, particularly in hardness change ratio in a repeated compression test and wet heat compression set. According to the process of the invention, such a foam can be obtained.

The present invention provides a microtesting rig for measuring mechanical properties of small specimens. The rig includes a microsized specimen positioned on a mounting block, an interchangeable contact tip connected with an actuator and configured for contact with the microsized specimen, and a magnifying imaging system for imaging the microsized specimen. The contact tip may be a fiber platen for compression testing or a fiber grip for tension testing.

Provided is a yellow toner having toner particles each containing at least a binder resin, a colorant, and a polar resin, the yellow toner being characterized in that: the colorant is a coloring compound having a specific structure; in a microscopic compression test at a measurement temperature of 25° C., the toner has a recovery ratio Z(25) of 40 to 80%; and the toner has a glass transition temperature (TgA) measured with a differential scanning calorimeter (DSC) of 40° C. to 60° C. and a temperature (P1) of the highest endothermic peak measured with the DSC of 70° C. to 90° C., and the temperature (P1) of the highest endothermic peak and the glass transition temperature (TgA) satisfy the relationship of 15° C.≦P1−TgA≦50° C.

This invention relates to one constant pushing test machine in metal materials stretching test technique field, which comprises machine rack, drive part and force test part, wherein, the rack is composed of socket, stand column, level beam and rack leg; the stand column is fixed onto socket with top end connected to beam to form one frame to fix drive and test parts; the drive part passes level beam fixed onto rack beam through drive screw or drive screw bar; the force test part is fixed on down end of drive part to realize puling and compressing data test.

The invention discloses a temperature-controlled type unsaturated soil consolidometer, which can be used for geotechnical engineering measuring apparatus manufacture. The temperature-controlled type unsaturated soil consolidometer comprises a combined type pressure chamber with a bidirectional motion loading pressure piston, a diversion system, a displacement meter and laser metering equipment. Heat conducting oil is filled in a sandwich chamber between the outer side of the combined type pressure chamber and an outer-layer transparent sleeve; and moreover, the sandwich chamber is also provided with a thermoelectric couple and a heating rod to control the temperature inside the pressure chamber. When the temperature-controlled type unsaturated soil consolidometer is used, a filter paper method of suction measurement can be employed for measuring the suction of an unsaturated sample under different temperatures; unsaturated soil drying and watering cycle tests controlled under suction and compression tests under constant suction can be implemented to obtain the influence rules of the temperature on the soil-water characteristic and mechanical characteristic of unsaturated soil; andsoaking expansion deformation tests and expansion pressure tests under different temperatures can be implemented, and the expansion deformation of the unsaturated soil and the changing rules of the expansibility are respectively obtained through the displacement meter or a load sensor. The temperature-controlled type unsaturated soil consolidometer has the advantages of complete functions, simplestructure, convenient operation and high test precision.

The invention discloses an assembled variable dimension direct shearing compression apparatus for performing shearing test and compression test on multiple types of variable dimension rock soil samples. Each of the upper shearing box and the lower shearing box of the main body of the apparatus adopts an assembled variable dimension sample box suite consisting of at least two sets of sample box rigid components which can be connected with each other in a laminated mode, each set of sample box rigid component comprises a plurality of sample loading rings which are nested by one another, and each inner sample loading ring is axially limited by each outer sample loading ring in a single direction; the rigid components which form the upper shearing box and the lower shearing box respectively are anchored together, and one set of rigid component is arranged in each of the upper shearing box and the lower shearing box; and a rolling support matching structure is arranged on the outermost sample loading ring, water draining grooves are formed on the sample loading rings which are positioned at the bottom of the lower shearing box, and the water draining function can be closed according toa test requirement. The direct shearing test and the compression test of soil samples and soft rock, the direct shearing test of rock joints and the in-situ direct shearing test of soil bodies and the soft rock can be performed. The apparatus is easy to operation and convenient to maintain, dismount and assemble and has high environment adaptability.

The invention relates to a location loading material testing machine which belongs to the technical field of material test. The location loading material testing machine is characterized in a location loading system; a support stand and a loading support part of the location loading system are respectively positioned at both ends of a fixing base; the loading support part comprises a location loading stand, a flange shaft, an overrunning clutch, a rolling bearing, a groove-shaped nut and two sliding blocks; three guide grooves are arranged on the location loading stand; the sliding blocks are respectively positioned in two keyways of the right external diameter of the groove-shaped nut; the overrunning clutch and the rolling bearing are fixed in the location loading stand in parallel; one end of the flange shaft is fixed by a hexagon nut through threads, and the other end is connected with the groove-shaped nut by threads; the left side of the groove-shaped nut is provided with a groove-shaped cavity; two through holes which are distributed left and right are radially arranged in the groove-shaped cavity; and the positions of the two through holes correspond to the first guide groove and the second guide groove on a loading support stand. The invention can realize a series of tension and compression tests and torsion tests by applying the guide grooves in the horizontal direction and the vertical direction of a location tension-compression-torsion loading stand.

The invention relates to a method for correcting an elasticity modulus and stress-strain curve in a metal material compression test and a related model. The model is a sandwiched model. According to the method for correcting a metal material compression elasticity modulus and stress-strain curve obtained by the model, most of national standard or non-national standard samples of metal materials with linear strengthening behaviors, particularly metal samples in which L is equal to (2.5-3.5) d or L is equal to (2.5-3.5) b or L is equal to 2d or L is equal to 2b can be corrected, so that the real compression elasticity modulus can be measured on samples which are unsuitable for measuring the compression elasticity modulus in the national standard stipulation; particularly, the method can be used for correcting the elasticity modulus and stress-strain curve of small-size non-national standard samples. According to the method, the construction of a mechanical constitutive equation is greatly convenient, and for research and development of novel materials, the requirements of the test technology on the sizes and shapes of the samples can be lowered, the measured mechanical parameters are reliable, and the research and development period is shortened.

The invention relates to a stretching, compression and bending combined load mode material mechanics performance test device under a microscope, and belongs to the electromechanics. A test platform includes a precision stretching / compression load driving unit, a precision bending load driving unit, a clamping unit, a detecting unit and the like. The test platform can be used for the sole stretching / compression test, sole three-point bending test, and the stretching / compression-bending combined load test. The invention has the advantages that the structure is small and compact, and the tests can be performed under the real-time observation of the optical microscope; the loading mode of the combined load is in conformity with the stress state of material and members under the actual workingcondition, and combined with the optical microscopic imaging system, deepgoing study on the micromechanics behavior and denaturing impairment mechanism of the material under the action of combined load can be carried out.

The invention discloses a method for predicting nickel base alloy high temperature flow stress and a dynamic recrystallization behavior. The method comprises the following steps: 1 obtaining true stress-true strain data of nickel base alloy by means of high temperature compression tests; 2 establishing a unified constructive model for predicting the nickel base alloy high temperature flow stress and the dynamic recrystallization behavior; 3 utilizing the numerical value difference principle, writing an iterative accumulation algorithm program, inserting numerical value simulation software, and by combining the true stress-true strain data of the nickel base alloy, determining material parameters of the unified constructive model for predicting the nickel base alloy high temperature flow stress and the dynamic recrystallization behavior; 4 predicting the nickel base alloy high temperature flow stress and the dynamic recrystallization behavior under the constant temperature and constant strain rate condition as well as under the variable temperature and variable strain rate condition. By means of the method, the nickel base alloy high temperature flow stress and the dynamic recrystallization behavior under the constant temperature and constant strain rate condition as well as under the variable temperature and variable strain rate condition can be predicted rapidly and accurately, and important technical guidance significance for formulating the nickel base alloy hot working process reasonably is achieved.

A semiconductor device includes a plurality of chips comprising a plurality of I / O terminals connected in common via through electrodes. Each of the chips includes an I / O compression circuit operable to output a compression result obtained by compression of data of a plurality of internal data buses to a first I / O terminal of the plurality of I / O terminals. Each of the chips also includes a test control circuit having a register group that sets the number of the first I / O terminal. Setting information that assigns different first I / O terminals to different chips is set in the register group. Each of the chips inputs or outputs data with use of the number of the I / O terminal that is different from those in other chips. Thus, the I / O compression circuits can concurrently perform an I / O compression test in parallel in the plurality of chips without a bus fight.

The invention provides a triaxial compression rheological test system capable of simulating an engineering geological environment, belonging to rock material compression experimental facilities. The remarkable characteristics of the invention are as follows: a test chamber in the triaxial compression rheological test system capable of simulating the engineering geological environment can depend on a normal rheological compression test device to realize the analogue simulation of the variations of a temperature field, a humidity field and a chemical field in the engineering geological environment by utilizing a humidifier, a heater and a fluid tank. The device fundamentally solves the problems of larger deviation of rock mechanics parameters obtained by a laboratory test and a field in-situ test and analogue simulation of a geotechnical wall-rock multi-field coupling environment. The test system has compact structure and low cost, is rather easy to install and dismount test pieces, detectors, pipelines and lead wires, and has stronger adaptability on the test pieces with different lithologies and sizes, thereby providing a set of complete technology and means for the study on the mechanical behavior of the wall-rock stability under a complex engineering geological condition.

The invention discloses an assembled size-changeable double-face shear apparatus for performing a direct shear test on various size-changeable rock test samples. An upper shear box, a lower shear box and a middle shear layer are assembled size-changeable test sample box sleeve pieces consisting of stacked test sample box rigid components; each test sample rigid component comprises a plurality of embedded sample accommodating rings; the inner side sample accommodating rings is axially limited by the outer side sample accommodating rings in one direction; the rigid components forming the upper shear box and the lower shear box respectively are anchored together; rolling supporting matched structures are arranged on the outmost side sample accommodating rings of the rigid components in the upper shear box and the lower shear box; water drainage slots are formed in the sample accommodating rings at the bottom of the lower shear box; and the water drainage function is shut down according to a test requirement. The assembled size-changeable double-face shear apparatus can perform the double-shear-face direct shear test on a soil sample and soft rock, and a lateral-restrict-free single-shaft compression test on hard rock is easy to operate, convenient to maintain and detachable, has high environmental adaptability, and is suitable for being used in indoor and outdoor rock direct shear compression tests.

The invention discloses two-shaft compression test equipment which comprises an axial load loading device, a square frame, a sample container, a first horizontal load loading device and a second horizontal load loading device, wherein the axial load loading device comprises fixedly arranged upper and lower reaction racks and an axial loading platform; the axial loading platform is arranged below the upper reaction rack and can be lifted; the square frame is arranged on the axial loading platform; the sample container is used for bearing a material sample and comprises a container bottom plate arranged on the square frame, left and right press plates with two ends capable of respectively horizontally moving and a loading cover plate arranged at the top and capable of moving along the vertical direction. The two-shaft compression test equipment is applicable for the two-dimensional ideal granular materials and can respectively apply positive stress in two orthogonal directions to realize different loading routes without considering the rotation of the stress main shaft.

The invention relates to an in situ nanomechanical test and discloses a trans-scale micro-nano scale in situ tension compression mechanical property test platform which can be provided for an in situ tension / compression test and synchronous detection and synthesis of load / displacement signals. The platform is characterized in that: the platform comprises an accurate drive unit, a signal detection and control unit, three freedom degree manual adjustment unit, a clamp and a support unit. A direct current servomotor of the accurate drive unit is connected with a two-stage turbine worm mechanism through a coupling. The signal detection and control unit comprises a displacement sensor, a force transducer and an encoder forming a fixed connection with the current servomotor. The three freedom degree manual adjustment unit comprises a Y-direction manual adjustment knob connected with a lower layer main body base of a X-Y manual platform, a X-direction manual adjustment knob connected with an upper layer main body base of the X-Y manual platform and a Z-direction manual adjustment screw connected with a Z-direction adjustment lower wedge-shaped block, wherein the Z-direction adjustment lower wedge-shaped block forms a sliding match with a Z-direction adjustment upper wedge-shaped block.

The invention discloses a rock-soil pressure shear rheological testing machine and a testing method, the testing machine comprises a mainframe, a vertical loading system and a horizontal loading system are provided on the mainframe, and a servo oil pressure system controlled by a computer provides oil pressure to the vertical loading system and the horizontal loading system. According to the invention, a shearing apparatus, the horizontal loading system, a servo hydraulic system and an electric control system are added for realizing automation, control and accuracy of the tests. An original waste and old press mainframe and a vertical oil cylinder are used by the testing machine, thereby about 50% of cost can be saved, the testing machine aims at test materials such as rock, rock mass and soil / stone compound body, and can perform with the following tests: a compression test, a shearing test, a residual strength shearing test, a compression rheological and shearing rheological test.

A testing machine includes a stand and a test device. The stand includes a base, box frame, a slide device driven to slide by a motor, and a control system controls the force applied on the test specimen. The test device is coupled at the slide device for performing various hardness tests consisting of Rockwell hardness test, Vickers hardness test, Brinell hardness test, micro-hardness test, and tension-compression test. The test device includes a force sensor and a data processing circuit converting an analog signal of the force sensor into digital data to interface with the control system.

The invention discloses a small-size self-centering one-way loading biaxial tension-compression test device. The device is characterized by comprising a loading transmission device and a combined type framework, wherein the combined framework is composed of a main framework 1 and a suspension framework 2, the loading transmission device comprises transverse loading shafts (12 and 13), vertical loading shafts (10 and 15), inclined rigid rods (9, 11, 14 and 16), transverse sliding rods (3 and 7), sliding connectors (4 and 8), stepping motors (5 and 6), fixing and sliding dual-use hinged supports (23 and 24) and fixing hinged supports (25 and 26). According to the small-size self-centering one-way loading biaxial tension-compression test device, the function of biaxial tension and compression can be achieved by means of one-way loading; and simultaneously, problems that the fluctuation process that the center of a test piece is deviated and goes back to the center of the loading device happens in the test process always and the test piece is difficult to clamp and adjust are solved.

The invention relates to a concrete lever type tension-compression creep device provided with a static pulley. The concrete lever type tension-compression creep device consists of a support device, a loading device and a test piece connecting device; the concrete lever type tension-compression creep device adopts a double-level mechanism to realize tension and compression. The concrete lever type tension-compression creep device has the beneficial technical effects that the device is simple and reliable in structure, is capable of applying a continuous and constant load onto a test piece, and is small in floor space; and two test functions including a tension test and a compression test can be provided by a set of device.

The invention provides a three-dimensional mechanical property tester for fabric and textile structural composite materials. The tester comprises an X-axis tension and compression unit, a Y-axis tension and compression unit, a vertical bursting unit and a digital speckle test unit. The X-axis tension and compression unit is used for tension or compression test of to-be-tested materials in an X-axis direction, the Y-axis tension and compression unit is used for tension or compression test of to-be-materials in a Y-axis direction, the vertical bursting unit is used for exerting abutting force along a direction which forms an included angle of 90 degrees with a plane of the X-axis and the Y-axis when performing X-axis tensioning and / or Y-axis tensioning on the to-be-tested materials, and the digital speckle test unit is used for measuring deformation of the to-be-tested materials when damaged by force. By performing one-way tension and compression and two-way tension and compression on the to-be-tested materials and exerting the vertical abutting force to test vertical bursting property of the to-be-tested materials when performing tension test, accurate analysis to three-dimensional multidirectional stressed damage property of the to-be-tested materials is realized.

A memory apparatus is configured by obtaining test information for each of group of memory locations within the memory apparatus, compressing the test information to produced compressed test information and, based on the compressed test information, replacing a group of redundant memory circuits respectively associated with the group of memory locations.

The invention provides a fatigue test method of an engine cylinder cover simulating test specimen. The fatigue test method comprises the following steps: through a finite element simulation method, computing three principal stress-strain values at different dangerous positions of an entity cylinder cover; establishing a test specimen model; setting the maximum cyclic load value required to be exerted to a unidirectional tension and compression test bench; computing three principal stress-strain values at dangerous positions of the test specimen model; comparing the three principal stress-strain values at the dangerous positions of the test specimen model with those of the entity cylinder cover respectively to determine the final test specimen model; machining and shaping the determined final test specimen model, and then performing fatigue test on the unidirectional tension and compression test bench. According to the fatigue test method, purely mechanical fatigue test replaces thermal-mechanical coupling fatigue test, so that the test period can be greatly reduced, and the test accuracy is ensured to a certain extent.

The invention discloses a Hopkinson tension and compression integrated experimental device. Air filling devices, air cylinders, shooting cannons, shooting cannon control systems and bullets, which are used for tension and compression tests, are two sets of systems independent of each other; a fixed guide rail, an adjustable supporting device, a data acquisition system, an incidence rod, a transmission rod and an absorption device are shared systems; the tension and compression tests can be performed respectively, and the cost can be greatly reduced; by virtue of boss threads, a test piece can be conveniently replaced, an experimental process is further simplified, and the efficiency of a single experiment with large experiment amount is remarkably improved.

A non-destructive method for evaluating the strength of cancellous bone includes the steps of performing at least two of the following tests on each cancellous bone of a population of cancellous bones: a manual compression test, an apparent density test, and an appearance test; determining a compressive strength for each cancellous bone based on the two tests performed; comparing the determined compressive strength of each cancellous bone against a predetermined compressive strength requirement; and, eliminating a subset of cancellous bone from the population of cancellous bone, which subset of cancellous bone fails to meet the predetermined compressive strength requirement.

The invention relates to a nonlinear mechanical test equipment for a deep rock body, belonging to the mechanical test equipment for the deep rock body in geotechnical engineering. At present, the conventional rock body mechanical test comprises a unidirectional compression test, a unidirectional tension test, a triaxial compression test and a shear test. The force and the mechanical behavior in the action process of the deep rock body have the very close relations with the loading process. The conventional rock body mechanical test modes and equipments can't reflect the special mechanical behavior related to the loading process of the deep rock body. Therefore, the invention adopts the scheme of that each direction of three dimensions of a hydraulic loading device is provided with an independent hydraulic power control device, and combines the corresponding test piece fixture to provide the nonlinear mechanical test equipment which implements the composite stress test for the engineering rock body, particularly for the deep engineering rock body in order to implement the intensive study for the stress state of the engineering rock body in the process of tension and compression, intensity character of tension and shear composite state, constitutive relation and construction.

A system, method, and computer program product for scan testing a device under test (DUT). In one embodiment, compressed test data comprising packets are received at a serial test data input. The packets contain encoded data characterizing a test data bit stream and each includes a bucket select field and a fill value field. The bucket select field contains an bucket select value that maps to a length of a bit-string. The fill value field contains a fill value indicating the uniform binary value of the bit-string. The compressed test data is then expanded and the expanded test data is scanned into internal structures of the DUT to test internal structures of the DUT. In a preferred embodiment, the compressed test data is received at a first clock rate. The test data is expanded and scanned into the internal structures of the DUT at a second clock rate that is higher than the first clock rate.

A testing machine includes a stand and a test device. The stand includes a base, box frame, a slide device driven to slide by a motor, and a control system controls the force applied on the test specimen. The test device is coupled at the slide device for performing various hardness tests consisting of Rockwell hardness test, Vickers hardness test, Brinell hardness test, micro-hardness test, and tension-compression test. The test device includes a force sensor and a data processing circuit converting an analog signal of the force sensor into digital data to interface with the control system.

A parallel compression test circuit of a memory device disperses peak current and reduce noise by operating input / output amplifiers at different timings in a parallel compression test mode. The parallel compression test circuit comprises an input / output amplification control unit for activating a plurality of input / output amplifiers connected to a selected bank in a normal mode, and activating the plurality of input / output amplifiers in each bank at different timings in a test mode.