413results about "Material strength using single impulsive force" patented technology

Systems and methods are directed toward low temperature testing of motion, vibration, or force responses of test fixtures. For cryogenic shock testing, a test object can be secured on a test apparatus, such as a test fixture of a shock table. An elongated enclosure, such as a flexible tube, can be connected between the test fixture and a laser vibrometer, positioned orthogonal to a surface normal at a test region of the test fixture to enable light emitted by the vibrometer to be reflected from the test region back to the vibrometer. A flow of purge gas can be introduced into the tube, proximate the test fixture, to direct moisture away from the test fixture. The flow can prevent condensation or ice from forming on the surface of the test fixture at the cryogenic temperature. A shock event can be simulated, and the response of the test region measured by the laser vibrometer. The impact of the shock event on the test object can then be observed.

This invention provides a split Hopkinson bar device for achieving single-pulse loading, comprising an incident bar, a transmission bar, an incident wave-catching unit, and a stress wave generating unit. The incident wave-catching unit includes an incident wave-catching sleeve and an absorbing bar. One end of the absorbing bar is spaced apart from the incident bar flange, and the other end is connected to the absorbing bar flange. The incident wave-catching sleeve is fitted around the absorbing bar, with its two ends respectively fitting against the absorbing bar flange and the incident bar flange. The compressive stress wave generated by the stress wave generating unit is reflected by the incident bar flange to form a tensile stress wave. After loading the sample, a portion of the stress wave is reflected back as a compressive wave and absorbed by the incident wave-catching unit. This solves the problem of multiple reflections and interference in traditional Hopkinson bars, achieving pure single-pulse tensile loading. The device is compact, has high energy utilization, and is suitable for testing the dynamic mechanical properties of materials.

An apparatus for testing a bottom protective board of a battery pack includes a base and a testing mechanism.SOLUTION: The base 100 is configured to support the bottom protective plate 300, the base 100 is provided with a measurement groove, a pressure sensor and a plastic deformation member are provided in the measurement groove, the base 100 is provided with a spacer block, and the bottom protective plate 300 and the base 100 are spaced apart by the spacer block to form an impact chamber; The test groove is located in the impact chamber, the test mechanism 200 includes a test stand 210 and an impact component 220, the test stand 210 and the impact component 220 are disposed on one side of the base 100, and the impact component 220 is suspended on the test stand 210 and located right above the base 100.SELECTED DRAWING: Figure 1

The utility model relates to a metal material impact testing machine which comprises a testing machine main body and a pendulum bob rotationally arranged on the testing machine main body, a base is arranged on the testing machine main body, and a placing table is arranged on the base; the jaw seats are arranged on the two sides of the placement table in a sliding manner; the two-way screw rod is rotationally arranged in the placing table, and the position between the jaw seats is adjusted through the two-way screw rod; by introducing the jaw seat arranged in a sliding mode and a bidirectional lead screw adjusting mechanism, flexible placement of metal materials of different sizes is achieved, the universality and adaptability of the testing machine are remarkably improved, meanwhile, due to the innovative design of the centering strip, through the combination of a notch in the cross rod and a rotating opening in the centering strip, the metal materials of different sizes can be conveniently and rapidly placed, and the testing efficiency is improved. Through flexible rotation of the centering strip in the range of 0-90 degrees, a user is allowed to easily align the centering strip with a preset notch in a sample, so that accurate centering of the sample in an impact test is ensured.

The present application relates to a kind of GH4706 alloy long time heat exposure organizational performance evaluation method, belong to high-temperature alloy performance evaluation technical field, solve the problem of not comprehensive of the performance evaluation of alloy by existing method.The method includes selecting alloy forge piece to carry out long term heat exposure test, obtains its organizational performance data and / or organizational parameter under different temperature and different heat exposure time, forms measured data set;Establish the relationship p=T(lgt+C) / 1000 between time-temperature uniform parameter and heat exposure time and heat exposure temperature, formula is substituted into by experimental data and different C value, calculate p;Through linear fitting, establish the preliminary fitting model between p and organizational performance data and / or organizational parameter;Determine the best C value;Establish the final fitting model between p and organizational performance data and / or organizational parameter;The equivalence of model is verified using p value, and performance is evaluated using final fitting model.The method of the present application is comprehensive to the performance evaluation of alloy.

The utility model belongs to the technical field of anchor rod testing devices, and discloses an anchor rod dynamic bearing capacity testing device based on a Hopkinson pressure bar. According to the anchor rod dynamic bearing capacity testing device based on the Hopkinson pressure bar, the telescopic end of the hydraulic jack extends out relative to the fixed end to apply pre-tightening force to the to-be-tested anchor rod, the pre-tightening force of the to-be-tested anchor rod is monitored through the anchor rod pre-tightening force measuring device, the pre-tightening force is accurately applied to the to-be-tested anchor rod, and operation is convenient; a bullet is launched to the end face of the incident rod through the launcher, the dynamic load impact of the bullet on the incident rod is transmitted to the to-be-tested anchor rod through the force transmission frame, the dynamic load impact is applied to the to-be-tested anchor rod, and the dynamic bearing capacity of the anchor rod is tested; in the process, the actual working condition of the anchor rod support is accurately simulated, the speed of the bullet is monitored through the speed acquisition instrument, and the strain data of the anchor rod to be tested are acquired through the strain acquisition instrument, so that the dynamic bearing capacity parameters of the anchor rod are accurately tested.

A liquid hydrogen tank having a tank in contact with liquid hydrogen, made of steel whose absorbed energy sE, measured by impact tests at a measurement temperature of -196°C or below using a three-sided slit Charpy impact test specimen, satisfies the following formula 1 or formula 2. sE≧19+0.68×ΔT···Formula 1 In Equation 1, the measured temperature is in the range of greater than -253°C and less than or equal to -196°C, and ΔT is the temperature difference between the measured temperature and -253°C. sE≧19...Equation 2 In Equation 2, the measurement temperature is -253°C or lower.

This application discloses a simulation device and method for multiple unidirectional impact load tests under gradient confining pressure, comprising a track, a specimen, and several impactors. The track includes a horizontal section, one end of which is connected to a ramp section. The specimen is located on the horizontal section, and a gradient confining pressure device is provided outside the specimen to pressurize it. Several impactors, acting as power input sources, are released from the ramp section at different heights above the ground and move along the track, sequentially impacting the specimen to apply multiple unidirectional impact loads. The impactors can be nested sequentially so that subsequent impactors can pass over earlier impactors, avoiding collisions between them. This application enables the specimen to be subjected to gradient confining pressure and multiple unidirectional impact loads to simulate the blasting damage effect of multiple blasting loads on surrounding rock with continuously changing stress states in underground engineering.

The invention discloses a Hopkinson bar experiment protection device suitable for different bar diameters, which comprises a base, the surface of the base is respectively connected with a first supporting seat and a second supporting seat, the first supporting seat is connected with a driving mechanism, the second supporting seat is connected with a buffer mechanism, and the driving mechanism and the buffer mechanism are both connected with the base through a plurality of supporting frames. The surface of the base is connected with a protection assembly, and the protection assembly is arranged between the first supporting base and the second supporting base. The invention further discloses a protection method suitable for the Hopkinson bar experiment protection device with different bar diameters. In the using process, the rod diameter adaptability is high, the universality is high, and the device can adapt to impact rods, input rods and output rods of different rod diameters through the design of the arc-shaped holes of the supporting frame and the replaceable wear-resisting cushion layer; meanwhile, the adjusting rod drives the fixing block to move up and down, round and square samples with different diameters and different shapes can be clamped, the whole set of supporting or fixing structure does not need to be replaced, and the cost of experimental equipment is remarkably reduced.

The invention belongs to the technical field of helmet production, and discloses helmet shell strength testing equipment based on high-precision pressure sensing, which comprises a base, a sliding rail is fixedly connected to the outer wall of the top end of the base, a sliding block is slidably connected to the outer wall of the sliding rail, and the helmet shell strength testing equipment further comprises a fixing mechanism arranged on the outer wall of the sliding block through a rotating mechanism; the touch block is mounted on the outer wall of the top end of the base through a replacement mechanism; wherein the fixing mechanism comprises a fixing block, the inner wall of the fixing block is rotationally connected with a rotating disc, an inclined groove is formed in the outer wall of the rotating disc, the inner wall of the inclined groove is in contact with a moving rod, and high-precision pressure sensors are embedded in a touch block and the mold; through cooperation of structures such as the fixed block and the rotating disc, the rotating rod is rotated after limitation of the rotating rod is removed, and the movable rod and the clamping block can be driven to move towards the middle at the same time through cooperation of the inclined groove and the guide groove, so that the helmet below the mold can be conveniently and rapidly clamped and fixed, and operation is simple.

The application discloses a docking instrument and docking method for a high-temperature Hopkinson pressure bar temperature control device, the docking instrument comprises a support platform, a heating furnace and a flat car, two groups of transverse and longitudinal intersecting translation assemblies are installed on the flat car, a lifting assembly is arranged on the top of the translation assembly, the support platform is arranged on the top of the lifting assembly, the heating furnace is rotationally installed on the support platform through a rotating assembly, a fixing assembly for fixing the flat car is arranged on the bottom of the flat car, and two pressure bar positioning assemblies for docking incident bars and transmission bars are symmetrically arranged on the two sides of the heating furnace. The three-dimensional movement of the heating furnace can be realized, the accurate docking between the heating furnace and the sample, the incident bar and the transmission bar can be realized, and the accurate judgment of the length of the incident bar and the transmission bar inserted into the heating furnace can be realized, so that the test error is greatly reduced, and the reliability of the test is improved.

The utility model relates to the technical field of municipal engineering, in particular to a municipal highway bridge bearing capacity detection device which comprises a mounting plate, four first connecting holes are formed in the upper end of the mounting plate in a penetrating mode, a hammering assembly is fixedly installed in the four first connecting holes jointly, six supporting columns are fixedly connected to the lower end of the mounting plate, and the supporting columns are fixedly connected to the lower end of the mounting plate. The six supporting columns are jointly and detachably provided with a supporting assembly, the outer surfaces of the two opposite supporting columns are jointly and fixedly provided with a connecting rod, and the upper end of the connecting rod is slidably connected with three probes. According to the municipal highway bridge bearing capacity detection device provided by the utility model, the supporting assembly is arranged, so that the purposes of preventing equipment from inclining during detection after installation and improving the subsequent detection precision are achieved; by arranging the hammering assembly, the purposes of improving the bearing capacity testing accuracy and reducing the labor burden of workers are achieved.

The utility model provides a slope impact testing machine. The slope impact testing machine is characterized in that a base is arranged on one side of the bottom of an impact table; the first bearing seat is connected to the top end of the side, away from the impact table, of the base through bolts. The impact track frame is arranged over the base, second bearing seats are clamped on the front side and the rear side, close to the impact table, of the impact track frame, the bottoms of the second bearing seats are connected with the impact table, a lifting module is arranged in the center of the side, close to the impact table, of the impact track frame, and the bottom of the lifting module is clamped in the center of the first bearing seat; the loading trolley is arranged at the top of the impact track frame; the center of the trolley positioning and stopping module is arranged at the bottom of the loading trolley, and the left side and the right side of the trolley positioning and stopping module are arranged on the left side and the right side of the bottom of the impact track frame. Technicians judge whether the package design is qualified or not by judging whether the outer package of the household appliance has large deformation and fracture or not.

This application discloses a testing device, testing method, and processing technology for use in a liquid nitrogen environment, relating to the field of cryogenic testing technology. The device includes a liquid nitrogen tank for providing a liquid nitrogen environment; a testing turntable disposed within the liquid nitrogen tank for placing the test piece; a driving mechanism including a driving motor for driving the testing turntable to rotate; and a cryogenic protection device including a protective shell and a sealing connecting sleeve disposed within the protective shell, forming an isolation cavity between the protective shell and the sealing connecting sleeve. The sealing connecting sleeve is used to install the driving end of the driving motor, thus protecting the driving end of the driving motor. In a liquid nitrogen testing environment, the protective shell, the pressure barrier formed by the isolation cavity, and the sealing connecting sleeve provide multiple layers of protection for the driving motor, reducing the possibility of liquid nitrogen leakage and water vapor infiltration into the driving motor.

The invention belongs to the technical field of explosion impact and superspeed impact, and discloses a target damage characteristic measurement method based on a grid node state database. The target damage feature measurement method comprises the following steps: arranging grid nodes in a target to-be-measured area; establishing a grid node state database; monitoring a grid node state in real time; determining a damage position area according to database number information corresponding to the grid node state; and determining the damage change rate according to the moment information of the node state database. According to the target damage characteristic measurement method, grid nodes are arranged according to the area of a target to-be-measured region and the measurement accuracy requirement, the damage position and the damage region are measured and displayed quickly and accurately by detecting the state of the grid nodes in real time, the damage change rate is determined, data processing is simple, and the measurement accuracy is high. The method is suitable for occasions requiring high transient measurement of target damage characteristics in high dynamic change events such as explosion impact and superspeed impact, and has engineering practical value.

The utility model provides safety helmet quality detection equipment, and belongs to the technical field of safety helmet performance testing. Comprising a detection table, the middle of the top of the detection table is rotatably connected with a placement seat capable of placing a safety helmet to be detected, the detection table is provided with a fixing mechanism and a detection mechanism, the detection mechanism comprises a fixing block fixedly connected with the top of the detection table, and the fixing block is provided with a second sliding groove. And a second sliding block is slidably connected to the side, away from the containing base, of the fixing block, a first sliding groove is formed in the second sliding block, the top of the second sliding block is sleeved with a first round rod, and the first round rod is slidably connected with the second sliding groove. According to the utility model, through the arrangement of the detection mechanism, impact detection can be carried out on the safety helmet in different directions, the situation that the overall anti-collision performance of the safety helmet cannot be specifically detected through impact in a single direction is avoided, and the detection comprehensiveness and integrity of the safety helmet are ensured.

The utility model discloses a multi-layer support used for a sky screen test, which comprises a sky screen test support module, the sky screen test support module comprises a bottom layer support plate, a casing pipe is fixed at the corner of the upper end of the bottom layer support plate, a vertical rod is sleeved in the middle of the casing pipe, a top layer bracket is fixed at the top ends of the two groups of vertical rods in a threaded manner, and the top layer bracket is fixed at the bottom of the bottom layer support plate. A middle-layer material collecting box is arranged on the inner sides of the vertical rods, a movable shaft is connected to the end of one side of the middle-layer material collecting box in a penetrating mode, a movable plate is fixedly arranged in the middle of the movable shaft in a sleeving mode, and a positioning column extending out of the middle-layer material collecting box is arranged at one end of the movable plate in a penetrating mode; and a rectangular bulge is arranged at the upper end part of the movable plate. The slag discharging device can actively and conveniently finish discharging of collected slag, is simple, convenient, time-saving, efficient and convenient to use, meets the requirements, and greatly improves the using effect.

The application discloses a kind of detection device of packaging piece collision resistance, specifically related to packaging detection technical field, including base, detection assembly is arranged on the base, the detection assembly includes the carriage that is arranged at the top of base, one side of the carriage is equipped with up and down adjustable pallet, the bottom of the pallet is equipped with air cylinder, the output end of the air cylinder is equipped with two clamping rods, the position of air cylinder and clamping rod is adjusted by carriage, for detecting different positions of packaging piece.The present application is adjusted by the electric slide rail of carriage and the lifting adjustment of pallet, drives the clamping rod with collision sensor to realize the fixed-point collision of different points of packaging piece outer wall, verifies the impact resistance of outer wall, realizes the whole circumferential uniform collision of packaging piece inner wall, by oblique collision block simulates actual loading and unloading in the oblique impact scene, realizes the three-dimensional detection system of external fixed-point collision, inner wall rotation collision and inclination angle collision, completely solve the problem of single detection dimension of traditional device.

The utility model belongs to the technical field of PDCPD sample detection, and particularly relates to a sample detection device for PDCPD product production. A plurality of sliding grooves are formed in the top of the workbench. The side walls of the multiple sliding grooves are slidably connected with multiple first sliding blocks. The tops of the multiple first sliding blocks are fixedly connected with a detection disc. The inner side wall of the detection disc is fixedly connected with a plurality of fixed blocks; the plurality of fixing blocks are symmetrically arranged; the side wall of the detection disc is fixedly connected with a plurality of bases; the top of the base is rotationally connected with a rotating rod; the side wall of the rotating rod is fixedly connected with a lantern ring rod; the end part of the lantern ring rod is in threaded connection with a bolt; the multiple sliding grooves are formed in the top of the workbench, the first sliding blocks are slidably connected to the side walls of the sliding grooves and can slide on the side walls of the sliding grooves, the detection disc is fixedly connected to the tops of the first sliding blocks, the first sliding blocks can drive the detection disc to slide on the sliding grooves, and subsequent samples can be conveniently detected.

The utility model relates to the technical field of bridge handrail detection, in particular to a counter-force device for detecting horizontal thrust resistance of a bridge handrail, which is used for detecting thrust of the bridge handrail fixed at the top of a handrail base and comprises a counter-force frame body, the counter-force frame body comprises a transversely arranged bottom frame, and a fixing frame is longitudinally fixed at the end part of the bottom frame. A side frame is vertically fixed to the top end of the fixing frame, a first reinforcing rod and a second reinforcing rod are obliquely fixed between the bottom frame and the side frame, a horizontal thrust resisting assembly is detachably installed on the lower side of the side frame, and a thrust assembly is detachably installed on the upper side of the side frame. The counter-force frame has the advantages that counter-force can be provided by fixing the counter-force frame body through the handrail base, additional counter weight does not need to be provided, detection cost is saved, the whole counter-force frame body is convenient to assemble and convenient to move and detect, detection efficiency is greatly improved, a bridge structure cannot be damaged, practicability is good, and the counter-force frame is suitable for popularization.

The utility model relates to the technical field of toe guard strength testing equipment, and discloses elevator toe guard impact strength testing equipment, which comprises a supporting seat, a bearing plate and a strength tester main body, a rubber bump is fixedly arranged at the upper end of a shock pad, a buffer spring is fixedly arranged between a reinforcing frame and the bottom of the supporting seat, and the bearing plate is fixedly arranged on the supporting seat. According to the strength tester, the reinforcing frame is arranged at the bottom of the supporting seat, meanwhile, the shock pad is arranged between the supporting seat and the bearing plate, and the rubber convex blocks are uniformly distributed on the shock pad, so that part of vibration energy can be further effectively absorbed and dispersed; and finally, a screw block moves back and forth along the inner wall of a sliding rail, and meanwhile, a strength tester main body on a mounting seat is driven to horizontally move in the other direction, so that the strength tester main body can carry out strength testing on different parts of the toe guard, and the accuracy of detection data is improved.

The utility model relates to the technical field of concrete detection, in particular to a concrete strength nondestructive testing needle instrument, which comprises a main body, a display, a detection rod and a connector, the display is fixedly connected on the surface of the main body, the detection rod is fixedly connected with one end of the main body through the connector, and a protective device is fixedly arranged on the surface of the main body. A first surrounding plate is fixedly connected to the side face of the body, and a groove is formed in the face, away from the body, of the first surrounding plate. According to the utility model, the protective device is arranged, so that the vibration force generated when the equipment is used is effectively reduced, the effect of reducing the vibration generated on the hand when the equipment is used is achieved, when common equipment is used, a user holds the equipment by hand to detect concrete, and due to the fact that the equipment detects the concrete in an impact mode, the equipment is very convenient to use. And the situation that the equipment is difficult to hold stably and falls to the ground to be damaged due to the fact that the hand of the user is sore due to strong vibration generated during collision is avoided, and the stability of the equipment held by the user is greatly improved.

The invention provides a biaxial impact loading test device for protrusion-impact composite dynamic disasters, and relates to the technical field of coal rock dynamic disaster tests. Comprising a sealing test cavity, multidirectional static loading devices, one-way impact loading devices, a lateral restraining device, a detachable side wall assembly, a pressure stabilizing type gas supply system and a mechanical driving mechanism, the sealing test cavity is used for loading a sample, and the multidirectional static loading devices are arranged in the X direction and the Z direction of the sealing test cavity respectively. Compared with an existing test device, the device has the advantages that coupling triggering of controllable unloading lateral constraint and impact loading is realized for the first time, so that a coal body failure mode and a gas release process are closer to actual mining conditions; and a high-fidelity and repeatable experiment platform is provided for revealing an inoculation and triggering mechanism of the outburst-impact hybrid dynamic disaster, establishing a risk evaluation index system and calibrating field monitoring and early warning parameters.