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2705results about "Material strength using repeated/pulsating forces" patented technology

Natural gas hydrate deposit dynamic triaxial mechanic-acoustic-electrical synchronous test experimental device and method

The invention provides a natural gas hydrate deposit dynamic triaxial mechanic-acoustic-electrical synchronous test experimental device, and a test method. The natural gas hydrate deposit dynamic triaxial mechanic-acoustic-electrical synchronous test experimental device comprises an acoustic wave receiving device, an acoustic wave transmitting device, and a resistivity testing device. The natural gas hydrate deposit dynamic triaxial mechanic-acoustic-electrical synchronous test experiment method comprises the steps that: step A, a hydrate sample is synthesized; step B, the synthesized hydrate sample is subjected to dynamic loading, and electric-acoustic-mechanical property tests are simultaneously carried out, until the sample is subjected to shearing damage. The invention provides a mechanical response characteristic research of indoor hydrate deposit under dynamic load. With the device and the method, mechanical, electrical, and acoustic parameter synchronous testing of hydrate deposit under dynamic load can be realized. With the test data, a relationship between mechanical parameters and wave velocity can be obtained by fitting.
Owner:PETROCHINA CO LTD

High temperature composite fatigue loading method and apparatus for turbine disc/blade joggled joint

A turbine disc/blade tenon connection high-temperature combined fatigue loading device comprises a low cycle load stress application mechanism, a force transmission pin, a force transmission main tension plate, a force transmission crown plate, a force transmission round bar, a blade clamp, a rolling bearing, a hold-down bolt, a high cycle transmission plate, a high-frequency heating cycle, and a vibration generator, wherein, the low cycle load stress application mechanism is connected with the force transmission main tension plate through the force transmission pin; the force transmission main tension plate is connected with the force transmission round bar through the rolling bearing; the lower end of the force transmission crown plate is sleeved on the force transmission round bar, and the upper end is connected with the load bearing dummy club of the blade clamp through the rolling bearing; the blade clamp is connected with the blade of a turbine through the hold-down bolt; the turbine disc is connected with the low cycle load stress application mechanism through the force transmission pin; the high cycle transmission plate is connected with the blade clamp through the hold-down bolt; and the vibration generator is positioned on one side above a high cycle load transmission plate. The loading method is characterized in that the force application point of low cycle loads is moved backwards, thereby enabling small high cycle loads to be smoothly transferred to the tenon connection position, ensuring the stress distribution along the tenon tooth is reasonable, and preventing combined loads from interfering with each other.
Owner:BEIHANG UNIV

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

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

Method for testing accelerating and loading of main drive wheel type pavement materials and device

The invention discloses a method for testing accelerating and loading of main drive wheel type pavement materials and a device thereof. The device comprises a control console, a PLC control box, an electronic box, a hydraulic device, a motor, a brake, a driving chain and chain wheel, a drive wheel, a driven wheel, a water bath tank, a circulated air inlet duct, a thermostatic chamber, a test cabinet and a circulated air outlet duct; the control console is positioned on the outside of the test cabinet; the hydraulic device is connected with the driven wheel; the motor is connected with the drive wheel via the driving chain and chain wheel; the drive wheel is fixed on a bracket; the driven wheel is positioned in a guide slot; the water bath tank is arranged right below the driven wheel; a ranging laser is positioned on one side of the driven wheel; one end of the drive wheel is provided with a microphone and the bottom thereof is provided with a torque sensor; the contact surface of the drive wheel and a test piece is provided with a pressure sensor; two tachometers are fixed on the bracket and are respectively positioned on the outsides of the drive wheel and the driven wheel. The device has simple structure, low prices, flexible use and good reliability.
Owner:SOUTH CHINA UNIV OF TECH

General Hopkinson bar device for compression load and stretching load

The invention discloses a general Hopkinson bar device for compression load and stretching load, which aims to integrate compression load and stretching load into an experiment system. The invention has the technical scheme that the general Hopkinson bar device comprises a bidirectional gas emitting thrower and a bar system. The bidirectional gas emitting thrower accelerates a bullet leftwards orrightwards based on experiment requirements and comprises a high pressure gas container, a thrower pipe, a gas inlet control valve, a first gas outlet control valve, a second gas outlet control valve,a first connection pipe, a second connection pipe, a first gas conversion joint, a second gas conversion joint, a columniform or cylindrical bullet, a columniform or cylindrical top plug corresponding to the columniform or cylindrical bullet, and a top needle. The bar system comprises a compression incident bar, a compression transmission bar, a stretching incident bar, a stretching transmissionbar and strain foils. The general Hopkinson bar device overcomes difficulties in respectively creating two sets of independent equipment for a Hopkinson compression bar and a Hopkinson stretching bar,realizes the integration of the Hopkinson compression bar and the Hopkinson stretching bar and can be converted conveniently between the two load modes.
Owner:NAT UNIV OF DEFENSE TECH

Temperature compensated surface-launched acoustic wave sensor

A method and apparatus for improving temperature stability of surface-launched acoustic wave sensors is described. The system includes a plurality of acoustic wave delay lines or resonators coated with identical films which are physically, chemically, biologically, or otherwise sensitive to one or more target chemical or biological analytes. At least one of the delay lines or resonators, referred to herein as reference channels, is used as a frequency reference to which the oscillation frequencies of the remainder of the delay lines or resonators, referred to as sensing channels, are compared. A thin coating of material that is preferably a passivation layer not sensitive to the analytes, is disposed upon the surface-launched acoustic wave sensor. The passivation layer covers sensing films on the reference channels, blocking or impeding interaction of the sensing films and the analytes thereby. The passivation layer is covered by the sensing films on the sensing channels, allowing interaction between the sensing films and the analytes thereby. All reference and sensing channels are preferably configured as oscillators, whereby effects of temperature fluctuation can be reduced significantly through subtractive combination of the reference and sensing channel oscillation frequencies.
Owner:SENSOR RES & DEV
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