467 results about "Universal testing machine" patented technology

The invention relates to a device and a method for testing mechanical property of a hyper-elastic material. The device mainly comprises a reinforcing piece (4) at the end of a test piece and a test piece clamp, wherein the reinforcing piece (4) has a trapezoidal cross section; a clamping port of the clamp is an inclined surface; the reinforcing piece (4) is adhered to the end of the test piece and is arranged in the clamp, the inclined surface of the clamp tightly clamps the inclined surface of the reinforcing piece (4), and the clamp is self-locked in the tensioning process and is prevented from locally deforming. The device is applied to multiple stress-strain tests of the hyper-elastic material such as uniaxial tension, equally biaxial tension and planar tension (pure shear). Stress data is acquired by a data acquisition system of an electronic universal testing machine, and the strain data is acquired by a charge coupled device (CCD) image acquisition device. Due to the technical scheme, the clamping force is high when the tension is high in the process of tensioning the test piece, so that the test piece is uniformly stressed, more accurate testing data can be obtained, and the mechanical property parameters of the hyper-elastic material obtained accordingly are more reliable.

The invention discloses a multi-field coupled environment simulating and online monitoring/observing system. The system comprises: a main body test box provided with a quartz observing window and an infrared window; a mechanical loading module comprising two coaxially arranged mechanical loading shafts and respectively connected with the main shafts of a universal testing machine and a sample clamping device; a multi-field service environment module arranged outside the main body test box and comprising an infrared laser rapid heating device, an X-ray radiation device, a corrosion gas box and a cooling system and respectively used for realizing heating, irradiating, corroding and cooling environments; and a damage online monitoring/observing module comprising a surface/interface strain real-time observation system, an in-situ fracture behavior observation system, a damage signal collecting system and an infrared thermodetector which are arranged outside the main body test box, and damage signal detectors arranged at the upper end and the lower end of a tested sample, and wherein devices contained in the damage online monitoring/observing module are respectively used for real-time capturing of strain information, in-situ fracture image information, damage information and temperature information, and synchronously run through a cynchronous control system.

The invention relates to a method for testing a mechanical property of a braze welding connector. The method comprises the following steps: (1) preparing a T-shaped tensile sample; (2) preparing test equipment including an electronic universal testing machine, a clamp, a heating furnace, a temperature control system and a control system; (3) installing the T-shaped tensile sample; (4) testing the mechanical property of a T-shaped tensile sample connector in an environment of the room temperature; (5) testing the mechanical property of the T-shaped tensile sample connector in a high-temperature environment; (6) representing the mechanical property of the connector: integrating a load-displacement curve, dividing the area of a fractured surface to obtain fracture total energy, calculating interface fracture energy (refer to the specification) and a maximal load (refer to the specification) when in fracturing, wherein the interface fracture energy and the maximal load are main parameters representing the mechanical property of the tensile sample. The T-shaped connector sample conforming to the real structure stress situation is provided; the problem that the method for testing the mechanical property of the braze soldering plate-fin structure is in lack and the rest result is incorrect can be solved; the test method is simple, data can be automatically acquired, error in manual operation can be avoided, more efficiency in test can be achieved, and the test result is more accurate.

The invention discloses a temperature measurement method for electrified tensile test pieces and a tensile test device. An electronic universal testing machine with an insulating chuck is used for finishing an electrified unidirectional tensile test of metal test pieces and real-time measurement on the temperatures of the test pieces through thermocouple matching. The method comprises the steps: firstly spraying a protective agent to each of the test pieces to carry out anti-oxidization treatment; after the surface protective coating layers are naturally dried at a room temperature, performing insulating treatment on a thermocouple, clamping the two unidirectional tensile test pieces by the insulating chuck of the electronic universal testing machine, clamping the thermocouple between the two test pieces to ensure that the temperature measured by the thermocouple is the real temperatures of the center positions of the test pieces, electrifying a direct current power supply to heat the test pieces, and measuring the temperatures of the test pieces in real time by a thermocouple temperature measurer; after the test pieces reach the stable temperatures, switching on the electronic universal testing machine to carry out the unidirectional tensile test on the test pieces. Therefore, accurate temperature measurement on the unidirectional tensile test pieces can be guaranteed; furthermore, the test device is simple in structure, short in manufacturing period and low in cost.

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 coal body permeability characteristic testing system. The coal body permeability characteristic testing system comprises an electronic universal testing machine, a permeability characteristic testing device, a vibration detecting device, a first gas system, a confining pressure hydraulic system and a computer, wherein the permeability characteristic testing device consists of a lane simulating mechanism and a lane ambient environment simulating mechanism; the lane simulating mechanism comprises a baffle, a breathable plate, a coal rock sample and a U-shaped clamping sleeve; the lane ambient environment simulating mechanism comprises a base, a cylinder tube, a lower pressing head, an upper half concave surface pressing head, an upper half convex surface pressing head and a piston; the first gas system comprises a first gas tank, a first pressure reduction valve and a first gas pressure meter; the confining pressure hydraulic system comprises a confining pressure liquid tank, a hydraulic pump, a unidirectional valve, a confining pressure hydraulic meter and a confining pressure liquid overflow valve. The invention also provides a coal body permeability characteristic testing method. According to the coal body permeability characteristic testing system and method, the axial pressure, the confining pressure and the methane gas pressure are controllable, the gas permeability characteristics influenced by disturbance of a lane coal rock body and a coal mine deep part coal rock body can be tested, and the testing precision is high.

The invention provides a method for controlling whole-course displacement in a program-controlled metal material stretching test. The control method is arranged is a test application program of an electro-hydraulic servo or electronic universal testing machine; the control method comprises the following steps of: displacement control in the first stage, displacement control in the second stage, displacement control in the third stage and the displacement control in the fourth stage. The method has the effects that the control method provides a mathematic model which automatically computes theflexibility of the system in the testing process, and the model is simple and reliable and aims at the system flexibility computation on each testing sample. The whole test is carried out automatically, great convenience is brought to the testing personnel, and the working efficiency and accuracy of the yield strength test are improved obviously. The method is applicable to the requirements on thestretching rates at different stages of various metal material samples; furthermore, rate conversion is smoothly transitional before the yield stage is finished; and the discontinuity is not introduced on the stress-strain curve. The method is applicable to the production, research and technical reconstruction on a stretching testing machine.

The invention provides a method for measuring bond strength between a high-intensity glass fiber rib and concrete, which comprises the following steps of: A, pouring test pieces: inserting the high-intensity glass fiber rib into a PVC plastic sleeve in a cubic pouring mold, wherein the lower end of the high-intensity glass fiber rib is positioned in the cubic pouring mold, and the top of the high-intensity glass fiber rib extends out of the cubic pouring mold; B, performing the loading process: after curing the test pieces in a curing chamber to the age, taking the test pieces out for testing, and performing the test on a hydraulic universal testing machine; and C: calculating the bond strength: calculating a bond strength value tau between the high-intensity glass fiber rib and the concrete by the following formula. The measured result obtained by the method can more accurately reflect the bond strength between the high-intensity glass fiber rib and the concrete, and the method for measuring the bond strength between the high-intensity glass fiber rib and concrete has the advantages of simpleness and low cost.

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 method of an FRP reinforced concrete bond slip test. The method comprises the steps of determining a test piece for the test, manufacturing a connection structure of an FRP reinforced concrete test piece, selecting a universal testing machine, and determining a loading scheme as one-end loading and determining a loading mode as a displacement control mode. According to the step of manufacturing the connection structure of the FRP reinforced concrete test piece, a test piece component is arranged in the middle of poured concrete, and the test piece component is formed by inserting two FRP ribs into the two ends of a sleeve pipe respectively; the other ends of the two FRP ribs extend out of the sleeve pipe, and a bonding layer is arranged in the middle of the sleeve pipe; the two ends of the sleeve pipe are respectively provided with at least two wedged key blocks which are arranged in the sleeve pipe in the direction of the FRP ribs, and the two FRP ribs extend out of the two ends of the concrete; sleeves are arranged at the matched positions of the extending ends of the two FRP ribs respectively. The sleeves at the upper end and the lower end of the connection structure are fixed on an upper anchor and a lower anchor of the universal testing machine respectively. A data collecting system of the universal testing machine is used for collecting the total displacement of the whole connection structure, and a dial indicator is used for collecting relative displacement of the two FRP ribs and the test piece component, namely the sliding amount of the FRP ribs in the test piece component is obtained.

The invention relates to a molybdenum and molybdenum alloy bar/tube high-temperature tensile detection device and method. The device comprises a universal testing machine, a high-temperature furnace arranged between upper and lower cross beams of the universal testing machine, an extensometer which extends from the side wall of the high-temperature furnace into the furnace, a temperature controller connected with the high-temperature furnace, an upper clamp and a lower clamp which have the same structure, a clamp cooler and an inert atmosphere protector. The device can safely and stably complete the tensile property testing of the molybdenum and molybdenum alloy bar/tube at the temperature of 1200 DEG C, thereby satisfying the high-temperature tensile testing demands and enhancing the reliability of detection data.

The invention relates to a mechanical property test device, in particular to a test device for observing the mechanical property of an interface between underwater soil and a structure, which is especially suitable for researching the mechanical property of the interface between the underwater soil and the structure in a hydraulic building (structure). The test device comprises a fixing mechanism, a horizontal movement mechanism, a soil box and a loading system, and an electro-hydraulic servo movable and static universal testing machine is used as a main machine frame. A designed soil material is loaded in the soil box fixed on the horizontal movement mechanism. A structure test block is arranged on an upper chuck of the electro-hydraulic servo movable and static universal testing machine, a normal stress is applied through the vertical loading system, and the shear mechanical behavior of the interface between the underwater soil and the structure under normal stress and complex stress paths can be represented through the horizontal loading system. The normal force and the shear force in the interfere shear test are measured through a load sensor, a vertical displacement meter arranged on the top surface of the structure test sample is used for measuring the normal displacement of the interface in the test, and horizontal displacement meters arranged on two sides of the soil box are used for measuring the shear displacement in the test.

The invention discloses a thermal barrier coating thermal-mechanical fatigue test device for a gas environment. The device comprises a mounting sleeve, a universal testing machine, a sample loading member, a flame swinging part and a burner. The sample loading member is arranged in the mounting sleeve. The sample loading member is provided with upper and lower connectors. The upper and lower connectors are clamped by upper and lower clamps of the universal testing machine. A sample is fixed between the upper and lower connectors. The flame swinging part is a flame tube driven by a motor to swing and is installed on the end of the mounting sleeve, and the flame tube is located in the mounting sleeve. The burner produces high-temperature gas and sprays the high-temperature gas into the flame tube and the flame is sprayed to a sample through an outlet of the flame tube. By controlling flame tube swinging, a direction of high temperature gas is controlled so that the temperature of the sample produces high and low cyclic change. The test device realizes a fatigue life test on an aeroengine turbine blade thermal barrier coating under the mechanical cycle load and temperature cycle load and provides test data for aeronautical engine life estimation.

A method for measuring combination strength of an aluminum film of a film aluminum steel composite board and a steel substrate aims at solving the problem that the combination strength of the aluminum film of the film aluminum steel composite board and the steel substrate cannot be measured directly and accurately in the prior art. The method includes: using zinc-aluminum brazing filler metal forwelding an aluminum alloy and the aluminum film of the film aluminum steel composite board under anti-vacuum conditions and with the effect of an added heat source and ultrasound, and then performinga stretching and shearing test through an electronic universal testing machine. The method can directly measure the combination strength of the aluminum film of the film aluminum steel composite board and the steel substrate, requires no formula conversion, is easy to operate, needs no expensive experiment and can be applied to the field of mechanical property testing.

The invention discloses an optical fiber sensor strain sensitivity calibration method based on a bare optical fiber, belongs to the technical field of detection, and relates to the optical fiber strain sensor sensitivity calibration method based on the bare optical fiber. According to the method, an universal testing machine is used as an intermediary, when same force is loaded on a same specimen,same stress-strain is obtained, and the un-packaged bare optical fiber is used as a reference for calibrating a fiber bragg grating stress-strain sensor. In a calibration process, by operating a computer, the force loaded by a loading device every time is controlled, an optical fiber demodulation instrument is controlled to acquire measurement data, calibration data is used for being compared with the bare optical fiber, and the sensitivity of the fiber bragg grating strain sensor is obtained, so that a strain character of the fiber bragg grating sensor is accurately calibrated. The method issuitable for calibrating sensitivity coefficients of any optical fiber strain study sensors, errors caused by the problem of taking conversion from the loaded force to stretching stress, a specimen elasticity modulus range and the like into account are avoided, the calibration precision is greatly improved, moreover, operation is convenient, and the method is fast and easy to popularize.

The invention provides a preparation method for a crosslinkable high voltage-resistant high-energy density PVDF plastic film. The preparation method comprises the following steps: step 1, adding P(VDF-CTFE) into a boiling flask with three necks, simultaneously adding a solvent and a catalyst and carrying out stirring for a reaction; step 2, dumping a solution finally obtained in the step 1 into a hydrochloric acid beaker and allowing a polymer to be precipitated; step 3, dissolving the polymer obtained in the step 2 in N,N-dimethyl formamide (DMF), adding the radical initiator benzoyl peroxide (BPO) and curing a glass flake on which a polymer film is attached in a baking oven after complete volatilization of the solvent so as to obtain a crosslinked polymer film; and step 4, preparing a dumbbell-like sample from the crosslinked polymer film obtained in the step 3, drawing the sample on a universal testing machine so as to obtain the high voltage-resistant PVDF plastic film. The method provided by the invention overcomes the problem of difficult drawing of a fluorine polymer at a low temperature; moreover, crosslinking is favorable for microcrystallization of a thin film material, which facilitates improvement of breakdown field strength.

The invention relates to an automatic feeding device of a drop-hammer type impact testing machine, comprising a transmission mechanism and a test sample gripper, wherein a lifting guide rail pair of the transmission mechanism is fixed on a testing machine vertical column by a connection base, the lifting guide rail pair is slidably connected with a lifting connection bracket, and the lifting connection bracket is sleeved on a lifting ball screw pair; a horizontal connection fixed plate is connected with the lifting connection bracket, a horizontal moving guide rail pair is arranged on the horizontal connection fixed plate, the horizontal moving guide rail pair is slidably connected with a horizontal bracket, and the horizontal bracket is sleeved on a horizontal moving ball screw pair; and a transition bracket is connected to the horizontal bracket, and the test sample gripper is installed on the transition bracket. The automatic feeding device disclosed by the invention is reasonable in structure, convenient to operate and use, high in feeding speed, accurate in location, high in working efficiency, safe and reliable. The automatic feeding device is applicable to automatic feeding of a drop-hammer type impact testing machine, a metal universal testing machine, etc.