2991results about "Material strength using steady bending forces" patented technology

A method of constructing a sensor includes depositing a first material in a predetermined arrangement to form a structure. The depositing results in at least one void occurring within the structure. The method further includes depositing a second material within the voids. The second material may have electrical properties that vary according to deformation of the second material. The method also includes providing electrical access to the second material to enable observation of the one or more electrical properties. A sensor includes a structure that has one or more voids distributed within the structure. The sensor also includes a material deposited within the one or more voids. The material may be characterized by one or more electrical properties such as piezoresistivity. The sensor includes a first contact electrically coupled to a first location on the material, and a second contact electrically coupled to a second location on the material.

The invention provides a three-way loading mechanical property test system of a multifunctional lining segment joint, which mainly comprises a self-balancing frame sub-system, a loading sub-system, a test-piece support sub-system, a test-piece transporting sub-system, a loading control sub-system and a data acquisition sub-system. The loading sub-system adopts a modular design and can finish a shield tunneling lining segment inter-ring shearing test, a bending moment transferring test, a longitudinal joint corner rigidity test, a longitudinal joint radial shearing test and the like by different combinations. The system of the invention can preferably imitate three-way stress states of the shield tunneling lining segment joint in actual conditions and can finish various different loading modes to obtain mechanical parameters of the shield tunneling lining segment joint and mechanical properties of other similar structures.

The invention concerns a system operating unit (30) having a column (3) that is attachable by way of at least two supports (9, 10) to different points of a system housing (14). In the preferred embodiment, this column is attached laterally to the housing, the supports serving for attachment to the housing of the system. In addition, a retaining bracket (4) is connected to the column (3) in such a way that a horizontal deflection of the retaining bracket (4) about a vertical axis is possible.

A motion analysis device includes two posture angle sensors attached to a measurement object at locations distant from each other, a data acquisition section, a posture angle correction section, and a deformation amount calculation section. The data acquisition section acquires data of a first posture angle and a second posture angle respectively detected by the posture angle sensors. The posture angle correction section corrects a difference between the first posture angle and the second posture angle after starting a motion of the measurement object in accordance with a difference between the first posture angle and the second posture angle before starting the motion of the measurement object. The deformation amount calculation section calculates a deformation amount of the measurement object based on a difference between the first posture angle and the second posture angle corrected by the posture angle correction section.

The invention relates to a micro material mechanical performance testing platform under stretching-bending-twisting multi-loads, and belongs to the field of electromechanics. The micro material mechanical performance testing platform comprises a tension and compression module, a bending module, a twisting module, a detection control module and a test-piece clamping module, wherein the testing platform takes the tension and compression module as a basic function module; the twisting module is arranged at one end of the tension and compression module; the test-piece clamping module is arranged on the tension and compression module; the bending module is independently arranged at one side of a portal frame. The micro material mechanical performance testing platform can be taken as a material mechanical performance test device with an independent stretching/compressing mode or an independent bending mode or independent twisting mode, namely a single load testing mode, and can be applied to a material mechanical performance test of a twisting load under the given stretching/compressing stress level or a material mechanical performance test of a bending load under the given stretching/compressing stress level, namely a composite load testing mode. The stress strain process of a material under the effect of a composite load can be detected by the collection of a load/displacement signal by using the detection control module.

A resistivity tool for investigating a wall of a borehole drilled with a non-conductive mud includes a tool body adapted to be incorporated in a logging-while-drilling tool assembly; a resistivity sensor disposed on the tool body, wherein the resistivity sensor comprises a sensor pad supporting a current injector electrode, a current return electrode, and an array of measurement electrodes, and a circuitry for controlling current injection from the current injector electrode and for measuring voltage difference between electrodes in the array of measurement electrodes, wherein the current injector electrode and the current return electrode are disposed near opposite ends of the sensor pad and the array of measurement electrodes is disposed between the current injector electrode and the current return electrode, wherein the sensor pad is constructed of an insulating material and includes a conductive shielding member, or wherein the sensor pad is constructed of a conducting material and includes insulating sections around the electrodes.

The invention is an apparatus used for measuring flexible material flexural fatigue, with property of being consisted of crank block rack mechanism, force and displacement sensor, upper and lower cartridge, optical plummet centering system, up-and-down and rotation driving system and control circuit, program and signal collection system, finishing measurement of fixed point flexural fatigue and relaxation creep behaviour of flexible material with stationary load and stretch effectively and accurately. The index property measured are endurance failure time, endurance limit strength and limiting strain, relaxation time, sample thickness or diameter. The apparatus has simple but practical structure, convenient installation and replacement, many tunable parameters containing sample length, fixed points position and their distance, bending rotational angle and angular frequency, original load and stretch, accurate measurement, and can avoid influence of move of application point in bending, offset of sample and vibration.

The invention provides a test method capable of simply and conveniently testing mechanical properties of tensile strength, compressive strength, bending strength and fracture toughness of ceramic material and composite material thereof under superhigh temperature oxidation environment with the temperature of more than 1500 DEG C and a test device thereof. The test device is composed of a test frame, a fixed sample system, a loading system, a superhigh temperature flaming heating system, a record display system and a non-contact type infrared temperature measuring system. The method includes that acetylene or gasoline aeration flaming technology is adopted to locally and rapidly heat a sample, so that local temperature thereof reaches more than 1500 DEG C, a portable tester is utilized to apply bending, stretching or compressive load on the sample, and load value is recorded, thus obtaining mechanical properties of material. The invention has the advantages that operation is simple, the technology of local high temperature and synchronous loading on superhigh temperature sample is realized, superhigh temperature mechanical properties which can not be tested before such as strength and toughness of material can be conveniently measured under superhigh temperature oxidation environment by utilizing the test device of the invention.

Some embodiments include an apparatus for testing flexible displays. The apparatus can include: (a) a first clamp configured to receive a first end of the flexible display; (b) a second clamp configured to receive a second end of the flexible display, wherein the second end of the flexible display is opposite the first end of the flexible display; and (c) a test column. Other embodiments and methods are disclosed herein.

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.

A test fixture for use with a Dynamic Mechanical Analyzer (DMA) restrains a hollow cylindrical tube for purposes of performing either a tensile or transverse/bending load test. The fixture includes a clamp that is configured to restrain the tube without imparting a preload or changing a mechanical property of the tube.

A composite material II type crack growth rate measuring method capable of acquiring a crack growth S-N curve comprises five steps: 1, a single end-notched flexure (ENF) composite material sample is selected and formed through molding fiber cloth and resin; 2, the sample is tested through a three-point bending manner; 3, a triaxial movable high power digital measurement system is adopted to observe and measure the crack growth length, and the test load, the cycle index and the corresponding crack growth length are recorded; 4, the constant interface shear stress of a neutral surface of the composite material is worked out according to the engineering beam theory, and a three-parameter power function is adopted to fit the crack growth interface shear stress and the corresponding cycle index so as to obtain the crack growth S-N curve; 5, a dual-growth exponent function is utilized to fit the test load cycle index and the a-N curve of a corresponding crack growth length, and the crack growth rate is obtained after derivation; a Paris model and an energy release rate formula are adopted, and a crack growth rate curve is obtained through least-squares approximation.

The invention relates to a four-point bending test device for a full-size metal composite tube. The four-point bending test device for the full-size metal composite tube mainly comprises a base, two load supporting columns, clamping buckles for a detected metal composite tube, two loading oil cylinders, a controller, a sensor, a strain foil and a strain gauge, wherein intervals between the two loading oil cylinders and the adjacent load supporting columns are equal; the sensor is used for transmitting the pressure and stroke of each loading oil cylinder to the controller; and the strain foil transmits the local strain and stress size of the detected metal composite tube to the strain gauge. According to the structure, the whole full-size metal composite tube can be tested; the ends of the piston rods of the loading oil cylinders are hinged with the clamping buckle, so that the clamping buckle can be automatically changed and regulated along with a bending angle of a steel tube; and the clamping buckles for the detected metal composite tube can longitudinally rotate relative to the load supporting columns, so that a clamp can be always in surface contact with the steel tube. Therefore, the four-point bending test device for the full-size metal composite tube has the characteristics of simple structure, reasonable design and convenience in operation and application, and can detect the strain size and the stress size.

An improved test fixture to evaluate thin composite laminates commonly used in deployable space structures. The fixture is designed to impart a pure moment into the coupon, a necessary improvement to prior test methods where results are obtained by fitting material properties in a nonlinear structural analysis of the test. Fixture mechanics allow for direct calculation of the coupon flexural modulus and allowable flexural strain based on two key measurements, fixture displacement and applied load.

Positions of predetermined spots in a frame of a motorcycle are determined by sensing all the predetermined spots in one direction from a front side or a rear side of the frame of the motorcycle by a sensing device.

The invention relates to a steel-concrete composite column anti-seismic anti-torsion test loading device and a manufacturing method thereof, and belongs to the technical field of structure engineering. The steel-concrete composite column anti-seismic anti-torsion test loading device comprises a loading frame, a top beam, a base, an antifriction plate, a thrust jack, and two electro-hydraulic servo actuators. The loading frame is obtained by welding steel plates. All column bases of the loading frame are provided with bolt holes and are fixedly connected to the ground by ground anchor bolts. The top beam is obtained by welding steel plates. The bottom of the top beam is provided with bolt holes and is fixedly connected to a top steel plate of a test piece by bolts. The base is obtained by welding steel plates. The top of the base is provided with bolt holes and is connected to a bottom steel plate of the test piece by bolts. An upper end of the thrust jack is connected to the loading frame by a rolling bearing. The antifriction plate is horizontally arranged in the center of the top of the top beam. The electro-hydraulic servo actuators are arranged horizontally and are fixedly connected to the top beam. The steel-concrete composite column anti-seismic anti-torsion test loading device solves the problem of the prior art, has a simple structure, is convenient for use, has strong universality, can be used for anti-seismic anti-torsion tests on various steel-concrete composite columns, and has wide application prospects.

The invention provides a bending test device and a bending test method. The bending test device comprises a bearing platform, a bending unit and a parameter detection unit, wherein the bearing platform is used for bearing a to-be-tested object; the bending unit is used for controlling the first end of the to-be-tested object to swing repeatedly relative to the second end, so as to bend the to-be-tested object repeatedly; the bending unit is arranged on the bearing platform; the parameter detection unit is used for detecting the aging parameter of the to-be-tested object in the bending processof the to-be-tested object; the parameter detection unit is connected with the to-be-tested object. The invention aims to provide a bending test device and a bending test method, the performance change of the to-be-tested object can be visually monitored in a process of repeatedly bending a flexible display screen and other to-be-tested objects, then the aging degree of the to-be-tested object canbe visually judged according to the performance change in the bending test process, thereby improving the test efficiency and the test result accuracy.