1430 results about "Strength testing" patented technology

The invention provides a penetration and corrosion triaxial testing apparatus for gravel soil. The penetration and corrosion triaxial testing apparatus comprises a pressure control system, a penetration and corrosion triaxial testing system and a sand-water separation system, wherein the penetration and corrosion triaxial testing system is used for containing gravel soil samples and can form a penetration and corrosion environment with a multistage water head and complex stress condition through self-loaded axial pressure as well as confining pressure and water pressure, provided by a pressure supplying system; the contained gravel soil samples can flow out of the penetration and corrosion triaxial testing system in the penetration and corrosion environment and then enter the sand-water separation system. The invention also provides a testing method of the triaxial testing apparatus. According to the triaxial testing apparatus, the samples are placed in a pressure chamber with confining pressure to be saturated, so that the multistage water head can realize penetration, corrosion and strength testing under a condition that the real environment stress state is simulated; corroded particles are discharged through a porous chassis of the pressure chamber, the mass of the corroded particle can be weighed in real time after sand-soil separation, and the penetration and corrosion triaxial testing process with the multistage water head and the complex stress condition can be effectively carried out.

The invention discloses a static strength test method of a large vane used for wind power and electrical power and a test system thereof. The test method comprises the following steps: keeping the vane flat, fixing one end of the root of the vane through a fix support of the test system, vertically loading the vane with a crane, wherein the loading mode is as follows: single point loading through the crane is converted into multi-point loading through a load distributing beam; and then, transmitting the multi-point loading to the vane through a vane loading clamp. The lifting point of the crane, the load distributing beam and the vane loading clamp are connected together through slings provided with load sensors, a strain piece and a displacement sensor are arranged on the vane, and stress, shape change and displacement data information respectively collected from the loading process are used for determining whether the static strength of the vane meets the requirements of design or not. The test method of the invention has the advantages of low area limit, low test cost, convenient process operation and accurate test result; and the test system of the invention has the advantages of simple manufacturing, convenient assemble, low cost and long service life.

An apparatus and method tests the strength of a bond between a substrate, especially a vehicle window, and an item bonded thereto. The apparatus includes a force transfer shaft having a first end extending from a housing and a second end positioned within the housing, a ferromagnetic member connected to the end of the force transfer shaft positioned within the housing, and a permanent magnet having a predetermined pull force secured to the housing proximate the ferromagnetic member.

A thermoplastic composition, contains a polycarbonate resin, a polycarbonate-polysiloxane copolymer, an aromatic vinyl copolymer, an impact modifier, and a mineral filler, wherein the composition has least about 40% ductility under multiaxial impact strength test conditions per ASTM D3763 at −30° C. Alternatively, a composition contains a polycarbonate resin, a polycarbonate-polysiloxane copolymer in an amount sufficient to provide at least about 2.5 wt. % siloxane by weight of the composition, an aromatic vinyl copolymer comprising SAN, an impact modifier comprising ABS, and a mineral filler. Such compositions may be made by combining, by weight of the composition, polycarbonate resin, a polycarbonate-polysiloxane copolymer, an aromatic vinyl copolymer, an impact modifier, and a mineral filler, wherein the composition has at least 40% ductility under multiaxial impact strength test conditions per ASTM D3763 at −30° C. An article may be made from such a composition, optionally by molding, shaping or forming the composition to form the article.

The testing method of high-temp. component creep life adopts the simulation pipe-bursting test machine or durable strength testing machine to make creep rupture acceleration simulation test of new materials which have different ageing extents and are not aged under the condition of a series of temp. and stresses. It adopts polynomical regressive analysis method to process data, and obtain the relationship formula of non-aged material between ageing factor, temp. and life time. By utilizing test, data processing and formula operation the material creep service life can be obtained.

A method used for measuring temperature and strain simultaneously and based on brillouin scattering adopts one measuring system. The measuring system comprises a narrow linewidth laser, a polarization-maintaining coupler, an optical coupler, an optical modulator, an optical amplifier, a circulator, a photoelectric detector and a brillouin frequency shift and strength testing unit. A first optical port of the polarization-maintaining coupler is connected with the laser. A third optical port of the polarization-maintaining coupler is connected with a first optical port of the circulator through the optical modulator and the optical amplifier sequentially. A second optical port of the circulator is connected with sensor fiber, a third optical port of the circulator is connected with a first optical port of the optical coupler, a fourth optical port of the polarization-maintaining coupler is connected with a second optical port of the optical coupler, and a third optical port of the optical coupler is connected with the brillouin frequency shift and strength testing unit through the photoelectric detector. Under the premise that system measuring precision is not reduced, resolution ratio of a measuring space is improved, simultaneously signal to noise ratio of the system can be improved, sensing distance is increased, and measuring time is reduced.

A method and apparatus for estimating a property include evaluating a formation at a formation evaluation location using a formation evaluation tool, and estimating the property at least in part by engaging a borehole wall substantially adjacent the formation evaluation location with a formation strength test device.

The invention discloses a two-interface cementing strength testing device of a cementing sheath containing hydrates and an ice stratum. The testing device comprises a kettle shell base and a simulation sleeve which is vertically arranged in the middle of the kettle shell base. A polyvinyl alcohol membrane tube is arranged on the periphery of the simulation sleeve, an annular cavity is formed between the simulation sleeve and the polyvinyl alcohol membrane tube, a temperature control circulating bath sealing cover is arranged on the outer edge of the top of the kettle shell base in a surrounding mode, the position between the temperature control circulating bath sealing cover and the polyvinyl alcohol membrane tube is filled with a simulation stratum, the top of the simulation stratum is covered with a stratum kettle cover, the top of the simulation sleeve is covered with a pressurizing kettle cover which covers the top of the cavity, and a pressure device for pressurizing the pressurizing kettle cover is arranged above the pressurizing kettle cover. The testing device has the advantages that the structure is simple, installing and using are convenient, production cost is low, and a detection result is accurate and reliable.

The invention belongs to the strength testing techniques of airplanes, and relates to a testing method for a supporting coefficient of a loading end in a compression stabilization experiment of a wallboard. A supporting clamp for the compression stabilization experiment of a reinforced wallboard comprises a hinged support clamp with a supporting coefficient of 1, a simple support clamp with a supporting coefficient between 1 and 4, and a fixed support clamp with a supporting coefficient of 4; a rectangular groove is processed on one side of the plane of an articulation block; and the end socket of a test piece is directly embedded in the rectangular groove. In the invention, the design of the test piece is given first; then a foil gauge is arranged, and the test piece and the clamps are mounted; a compression load is loaded hierarchically, and the load-stress is tracked and measured; when a curve knee point is discovered, the load is unloaded, and the load at the knee point is recorded; the load at the knee point is led in a theoretical formula to obtain the supporting coefficient; and finally, through increasing H or increasing clamping force, the supporting coefficient is adjusted. The method has the characteristics of simple operation, high loading precision and low cost.

The invention belongs to a strength testing device and a testing method for a fuselage wall plate under the action of combined loads. The strength testing device for the fuselage wall plate under the action of the combined loads comprises corner boxes, airtight end plates, the fuselage wall plate, a hinge, mandrils, keels and arc-shaped rubber plates, wherein the airtight end plates are arranged at two ends of the fuselage wall plate, the corner boxes are arc-shaped components and installed at a combined part between the airtight end plates and the fuselage wall plate, the keels are arc-shaped frames, the keels are connected in a pasting mode through the arch-shaped rubber plates to form a keel group, the mandrils are installed on web plates at two ends of the keel group, and the hinge is arranged on the fuselage wall plate and the keel group and achieves hinged connection of the fuselage wall plate and the keel group. According to the strength testing device and the testing method for the fuselage wall plate under the action of the combined loads, boundary conditions of the fuselage wall plate can be effectively imitated, the combined loads are conveniently used for achieving a strength test, and due to the fact that drawing loads and compressing loads are not used at the same time, the applied combined loads are one kind of or two kinds of or three kinds of internal pressure loads, drawing loads (or compressing loads) and shear loads.

Disclosed are apparatus and methods for testing packaging and / or materials (e.g., package integrity and / or seal strength testing) wherein one or more coatings are applied to the one or more surfaces of the packaging and / or materials prior to testing. In one aspect of the present invention, when applied to a permeable package or a portion thereof, the coating transforms the package, or portion thereof, to an impermeable package or a package having impermeable portions thereof. After such transformation, a wider variety of testing methods including quantitative test methods may be used to test such permeable packages including standard burst seal strength, dye seal integrity, and package integrity tests. Furthermore, application of one or more coatings to the permeable package and / or material prior to testing enhances the sensitivity and repeatability of the test methods allowing for more reliable seal strength measurements and consistent detection of small defects (e.g., pinholes).

A method of testing and a tester apparatus to determine the axial stress and strain of cements under the temperature and pressures encountered by cement during use in wellbore environments. Using these stress and strain measurements, the Young's Modulus may be established for a material at the encountered temperature and pressure of the wellbore. By combining static tensile strength testing and elasticity measurements of cements, Young's Modulus values for different cement compositions under stresses that are similar to the conditions occurring in an actual wellbore are possible.

An unbonded capping system for compression testing of concrete cylinders comprises first and second retaining cups comprising metal blocks each having opposite parallel planar surfaces. A first of the planar surfaces is engageable by a test apparatus, in use. A second of the planar surfaces has a cylindrical cavity of a first select diameter for receiving one end of the concrete cylinder. First and second cylindrical compression pads are each to be received in one of the retaining cup cavities to abut an end of the concrete cylinder, in use. The compression pads are of a second select diameter smaller than the first select diameter of the cavity to define a circumferential space therebetween. Nubs are provided for gripping the cavity to prevent the compression pads from falling out of the cavities.

The invention discloses an interlayer tensile strength testing instrument for an asphalt pavement, which comprises a frame, a driving motor, a clamping mechanism, a drawing mechanism positioned above the clamping mechanism and used for upwardly drawing a tested piece by the driving motor through a transmission piece, as well as a force sensor for carrying out real-time test for drawing force applied onto the tested piece, and further comprises a data acquisition and control system used for analyzing and processing a signal tested by the force sensor and used for correspondingly controlling the driving motor according to processing results, as well as a host computer connected with the data acquisition and control system. The force sensor is connected with the data acquisition and control system; the driving motor adopts a stepping motor; and the data acquisition and control system adopts an MSP430 singlechip and carries out two-way communication with the host computer through a USB interface. The invention has the advantages of reasonable mechanical structure, small volume, light weight, high automation degree and simple use and operation; and meanwhile, the invention can effectively carry out real-time monitor and control of the tested piece and greatly improves the testing accuracy.

The invention provides a biaxial tensile strength testing fixture. With the fixture, variable-proportion biaxial tensile strength testing of a cross sample can be carried out with a uniaxial testing machine. The fixture is characterized by comprising an upper chuck, a primary lever crossbeam, a primary connecting rod, a secondary lever crossbeam, a secondary connecting rod, a loosening and tightening nut, a wire rope connector, a wire rope, a grooved flywheel, a bearing pedestal, a bearing, cross guide rails, a clamp with a slide block, a test piece, a base and a lower chuck. With the fixture, biaxial tensile strength testing of various load proportions can be implemented with the uniaxial testing machine. The fixture distributes pulling force at four directions in virtue of the lever balance theory, and pulling force at two axial directions of the test piece can be solved through static equilibrium, so usage of force sensors is avoided; moreover, the uniaxial testing machine is made full use of, the problems of lack of special biaxial strength testing equipment and high testing cost are overcome, and technical support is provided for determination of material performance and structural strength.

The invention relates to a method and an apparatus for testing the ice adhesion strength. The apparatus comprises parts of a sample mount, refrigeration units, a water titration unit, a sliding knife, a force sensor and the like. The method for testing the ice adhesion strength comprises the following steps: fixing a test piece to be tested on the sample mount, and refrigerating the test piece to be tested by the bottom refrigeration unit; titrating quantitative water to the surface of the test piece to be tested by a water titration device to allow water to rapidly freeze on the surface of the test piece to be tested when the temperature of the test piece to be tested achieves a preset refrigeration temperature; and parallelly trimming convex ice hulls on the surface of the test piece by the sliding knife with the force sensor, testing maximal force when ice is peeled (or ruptured), and treating the maximal force as the ice adhesion strength for characterizing the surface of a material or a coating. According to the method and the apparatus provided by the invention, the principle and the structure are simple, the operation is simple and convenient, and the tangential adhesion strength between the surface of the material (or the coating) and ice can be actually characterized; and the repetition reliability and the accuracy of tests can be guaranteed because main parameters of the freezing rule, the pattern, the experimental temperature and the like are accurately controlled.

The invention relates to soil property measuring equipment and method, aiming at providing silt anti-permeability strength testing equipment and method. The silt anti-permeability strength measuring equipment comprises a permeation container with a built-in cutting ring, the top of the permeation container is a top cap, and the bottom is a base; and a water inlet is connected with a water supply pipe and a water inlet pipe through a tee-joint valve, the water supply pipe is connected to a water level adjusting device, and the water inlet pipe is connected to a varying head device. The measuring equipment and method can be used for measuring the permeation deformation development law and characteristic of silt under the conditions of different geological conditions, grain composition, hydraulic conditions and different preventing and controlling measures as well as the critical state index of the silt when permeation failure occurs so as to provide references for preventing and controlling the permeation failure of a silt foundation. The invention has great significance on the researches of the permeation deformation, the critical hydraulic gradient and the anti-permeability strength of the silt. In addition, the invention can realize the simultaneous analysis of multiple samples, which greatly shortens the measuring time and improves the work efficiency.

A muscle strength testing and measuring apparatus contains a bar-like strength testing mechanism slidably placed over a pair of upright posts for adjustment of vertical position and allowing a variety of muscle groups to be tested by the user without any specialized knowledge. The apparatus can be used for physical training before and after exercise as well as for rehabilitation purposes. The position adjustment mechanism includes a jamming cylinder controlled by a link plate, which in turn can be activated by simple lifting or lowering the bar-like mechanism. Piezo-electric tensile sensors are placed in the middle portion of the mechanism to indicate the muscle force which signal is then transmitted to a display unit. Additional pull force strength testing units are placed over the same posts allowing also for adjustment of height position. A great number of configurations are described that can be achieved by easily switching the apparatus from one position to the next.

The invention relates to a measurement and control system for a hydraulic test. A system control part is composed of a PLC (programmable logic controller) control cabinet, an industrial personal computer and a printer, a PLC is included in the PLC control cabinet, and the industrial personal computer is used as an upper computer of the PLC and connected with the PLC via a communication cable; a measurement and control pipeline part comprises a gas source supply pipeline, a gas-driving booster pump A, a gas-driving booster pump B, a liquid source supply pipeline, a high hydraulic output pipeline and a liquid unloading pipeline; and the PLC outputs a current control signal to the output end of an electric proportional valve, and the electric proportional valve controls gas pressure and gas flow rate by adjusting the position of a gas inlet valve according to the current control signal and a gas pressure signal which is output in proportion. The measurement and control system can performvarious pressure tests including an intensity test, a burst test for a safety relief device of a container, and a test for the residual deformation rate of the container; automatic control and manualcontrol in the hydraulic test for a fire-fighting product are independent from each other and can be used independently; pressure-boosting speed is adjustable, pressure change and dynamic curve output are detected in time; the measurement and control system is high in pressure control accuracy, small in volume, light in weight and low in energy consumption; multi-level pressure-boosting can be realized; and the measurement and control system has the characteristics of being high in reliability, high in accuracy, easy in operation etc.

A tensile strength testing machine comprises a frame assembly that defines a test zone. The frame assembly includes a frame member that has first and second opposed ends. The ends have inner sides that generally face one another across the test zone, and outer sides that are generally opposed to one another and the test zone. An arbor element is mounted for generally axial movement relative to the first end. The arbor element is slidably mounted in the first end. The arbor element projects inwardly into the test zone and outwardly from the outer side of the first end. The arbor element is adapted to being attached to a test specimen, which mounted in the test zone. A portion of the arbor element that projects outwardly from the outer side of the first end is generally surrounded by an array of jack bolts. The jack bolts are threadably mounted in a collar member that is substantially axially fixed relative to the arbor element. The jack bolts are positioned to bear generally against the outer side of the first end. Typically, at least a thrust collar, and, preferably, a load determining assembly are interposed between this outer side and the bearing ends of the jack bolts. Torquing down the jack bolts against the outer side of the first end places the arbor element in tension. This tensile load is applied to a test specimen mounted in the test zone, and the magnitude of the load is determined.

The invention relates to a comprehensive strength testing method of the neural network technique, which combines the advantages of three strength testing methods: supersonic, rebounding and core drilling, thus solving various disadvantages of the existing single strength testing technique. The basic principle of the comprehensive strength testing method includes that: firstly, the strength of structural concrete is tested in full dimensions with the supersonic-rebounding comprehensive method, and then the R-N-C benchmark curve is properly corrected by the core drilling method, wherein, the determination of the optimum drilling core number is solved by the neural network technique. Concrete materials are degraded to different extends as large quantity of engineering structures are being influenced by such factors as environmental corrosion and temperature change, and the method of the invention can, on the basis of ensuring accurate and reliable test results, greatly reduce the structural damages caused by the core drilling strength testing method, improve the analysis efficiency and operability of the supersonic-rebounding-core drilling comprehensive strength testing method, so the method of the invention has wide application prospects in the strength testing of various concrete works .

The invention relates to the technical field of strength testing, and provides a jig for testing the dynamic impact strength of a chain and a rope. The jig comprises a machine frame, a fixing position, a bearing assembly and a lifting mechanism, wherein the fixing position is arranged on the top of the machine frame and is connected with one end of the chain to be tested and one end of the rope to be tested, the bearing assembly is located below the fixing position and is connected with the other end of the chain to be tested and the other end of the rope to be tested, the weight of the bearing assembly can be increased and reduced, the lifting mechanism is arranged on the machine frame and can drive the bearing assembly to move up and down and make the bearing assembly fall in a moment, and the lifting mechanism can produce impact pulling force on the chain to be tested and the rope to be tested. Due to the fact that one end of the chain to be tested and one end of the rope to be tested are fixed on the fixing position, the other end of the chain to be tested and the other end of the rope to be tested are connected with the bearing assembly, the bearing assembly is driven by the lifting mechanism to move up and fall in a moment, and the falling bearing assembly produces the impact pulling force on the chain to be tested and the rope to be tested, the dynamic impact strength of the chain and the rope can be tested. The weight of the bearing assembly can be increased and reduced according to different chains and ropes. The testing jig is easy and reliable to operate, working intensity is reduced, and working efficiency is improved.

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 discloses a rock tensile strength test apparatus capable of applying confining pressure, which can truly restore an environment in which rock is disposed. The rock tensile strength test apparatus comprises a base, wherein the base is connected with a top plate by virtue of a connecting rod; and the base is fixedly provided with a test assembly, the top plate is fixedly provided with a loading oil cylinder, and a loading rod of the loading oil cylinder stretches into the test assembly. By adopting the rock tensile strength test apparatus, the confining pressure, different temperature environments and rock burst can be applied to a test sample, an underground environmental condition of the rock can be truly simulated, so that an underground stress condition of the rock and the variation of tensile strength can be more precisely researched, and instructions and references can be provided for the subsequent design, construction, teaching, research and the like. By adopting the rock tensile strength test apparatus, the test sample can be rapidly centered, and a breaking time and pressure at the breaking time of the test sample can be discovered in time by virtue of a displacement of the loading rod. By virtue of a cooling assembly, heat of the loading rod and a lower supporting rod can be prevented from damaging the test apparatus.

The invention relates to a textile detector, especially an electronic textile intensity tester, having bracket, two screw rods, base, inverter, three-phase asynchronous machine, driving mechanism, control device, display device and computer installed with upgradable intensity detection control software, where the bracket has top beam and active beam, the active beam is connected with the screw rods, the driving mechanism is fixed with the screw rods, force sensor and textile holder are arranged between the top beam and active beam, the top beam is equipped with top and bottom limit switches, and code disc and position counter for measuring number of turns of screw rods, and the top and bottom limit switches, sensor, inverter and display device are connected with the control device, and the computer is connected with the control device, too. And it improves detection accuracy, as compared with the existing testers.

The invention discloses a shearing ultrasonic testing method of cement annular interface, comprising that pouring cement pulp between an inner muffle and an outer muffle until the pulp reaches preset height, pours water into the inner muffle and outside the outer muffle until the pressure container is filled, arranging an sonic measuring device vertically and concentrically in the inner muffle, connecting a heating power circuit with all temperature and pressure sensors and the sonic measuring circuit, and connecting the power source, heating the pressure container, and pumping liquid into the pressure container when the temperature reaches preset value, to lift liquid pressure to preset value, processing sonic measurement intermitted, and processing sonic measurement when the cement reaches preset strength, and processing adhesive strength test when the system enters into the adhesive strength test step, and processing the last sonic measurement.