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4607results about "Strength properties" patented technology

System and method for performing impact loading on micro test piece and measuring dynamic mechanical property

InactiveCN102135480ASolve the study of dynamic mechanical properties at high strain ratesLaunch fastStrength propertiesFerroelectric thin filmsStress–strain curve
The invention relates to a system and a method for performing impact loading on a micro test piece and measuring dynamic mechanical property. The method comprises the following steps of: instantly accelerating a bullet by using an electromagnetic pulse launch technology and launching the bullet at high speed; transmitting a stretching stress wave generated by collision of the bullet to the micro test piece by using a separated Hopkinson bar technology so as to generate the impact loading on the micro test piece; recording strain data of an input bar and an output bar, and acquiring an enlarged surface dynamic deformation image of the micro test piece; analyzing and obtaining a stress strain curve of the micro test piece subjected to the impact loading having different strain rates; and analyzing the surface dynamic deformation image of the micro test piece and obtaining a distribution of a bidimensional displacement field and a strain field during dynamic impact loading of the micro test piece. By the system and the method, the problem of research on the dynamic mechanical property of a micro electro mechanical system (MEMS), and membrane materials such as piezoelectric thin films, ferroelectric thin films and the like is solved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Rock high pressure infiltration experiment system

The invention provides a rock high-pressure permeability test system, comprising a sample depression box device which is provided with a heavy frame inside, a hydraulic jack positioned inside the heavy frame, a movable trolley positioned on the top of the hydraulic jack, and a triaxial depression box fixed on the movable trolley, wherein, the triaxial depression box comprises a confining pressure chamber body, a depression box base with an seepage water inlet and a confining pressure water inlet, a lower actuating post system which is positioned on the depression box base and is communicated with the seepage water inlet and a seepage water channel on the sample, an upper actuating post system of the seepage water outlet which is positioned on the top of the depression box and is communicated with the seepage water channel on the sample. The test system is provided with an oil-water converting dynamic control system which is connected with the hydraulic jack, the seepage water inlet and the confining pressure water inlet respectively. The invention can test the permeability of the sample under various conditions, conventional triaxial mechanical characteristics of various loading paths, the seepage at a high permeability pressure, and the stress coupling process and can control the shaft pressure, the confining pressure, the permeability pressure and the axial displacement accurately.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY

Large-sized combined dynamic and static multifunctional geotechnical engineering simulation testing device

The invention relates to a large-sized combined dynamic and static multifunctional geotechnical engineering simulation testing device which comprises a plurality of counterforce stand devices, a front visible counterforce beam, a rear loading counterforce beam, an arch-shaped dynamic counterforce frame, a hydraulic loading system, a servo dynamic loading system, a model elevating translational trolley system and the like, wherein each counterforce stand device is formed by connecting a top beam, a side beam and a bottom beam through flanges and high-intensity bolts and can be combined freely according to a testing model; the left and the right parts of the front and the rear counterforce beams are connected with the side beam; the upper and the lower parts of the front and the rear counterforce beams are connected with the model elevating translational trolley system through pull rods; the hydraulic loading system is arranged in a steel grid formed by the top beam, the side beam and the rear loading counterforce beam; the arch-shaped dynamic counterforce frame is independent; and after the top beam is detached, the servo dynamic loading system can be arranged. The testing device is compact and reasonable in structure, narrow on the upper part and wide on the lower part, assembled flexibly, easy to operate, and convenient to load and observe and can be applied to planar and three-dimensional geomechanics static and dynamic model testing of geotechnical engineering under the conditions of foundation pits, side slopes and high ground stress.
Owner:山东百廿慧通工程科技有限公司

Camera automatic regulating image acquisition device and method for fatigue crack propagation test

The invention relates to a camera automatic regulating crack image acquisition system for a fatigue crack propagation test, which comprises a crack image imaging and acquiring system, a camera position regulating system and a computer processing and analysis control system, wherein the crack image imaging and acquiring system comprises a CCD (Charge Coupled Device) camera, a lens, a light source illuminating device, a camera mounting bracket and an image acquiring card; the CCD camera, the lens and the light source illuminating device are arranged on the camera mounting bracket to form a crack image imaging unit; the image acquiring card is connected with a computer; a camera position regulating device comprises a stepping motor, a camera motion positioning cloud deck, a motion controller and a stepping motor driver; and the computer processing and analysis control system comprise the computer and a camera automatic regulating image acquisition module in an ARM motion controller. The invention also provides a camera automatic regulating crack image acquisition method for the fatigue crack propagation test. According to the camera automatic regulating image acquisition device and method for fatigue crack propagation test provided by the invention, the full-automatic operation is adopted; the control accuracy is high; and the real-time performance is excellent; and the labor intensity is reduced.
Owner:ZHEJIANG UNIV OF TECH
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