768results about "Material strength using single impulsive force" patented technology

The invention discloses a laminated plate impact event three-dimensional strain field inversion method based on binocular vision, and the method comprises the steps: laying dynamic tracking mark points on the surface of an impacted carbon fiber laminated plate, synchronously collecting the image data of the whole impact process through a high-speed binocular camera, and generating a binocular vision image sequence with impact time sequence information; generating three-dimensional displacement field data of the impact area of the carbon fiber laminated plate based on the binocular vision image sequence; calling the anisotropic constitutive model of the carbon fiber laminated plate to generate a preliminary three-dimensional strain field inversion result; and performing coupling operation on the preliminary three-dimensional strain field inversion result, the impact load parameter and the laminated plate material characteristic parameter to generate a final carbon fiber laminated plate three-dimensional strain field inversion result consistent with the dynamic response of the impact event. According to the embodiment of the invention, accurate full-field representation of the dynamic strain of the impact event can be realized, and reliable data support is provided for impact resistance evaluation and structure optimization of the laminated plate.

The invention relates to the technical field of new energy automobile battery testing, and discloses a new energy automobile battery aluminum alloy bottom shell impact testing device and method. The new energy automobile battery aluminum alloy bottom shell impact test device comprises a base, a driving frame is slidably arranged on the base, an acceleration mechanism for driving the driving frame to move at a high speed is installed on the base, a rotary driving seat is fixedly connected to the upper end of the driving frame, and a servo motor is installed in the rotary driving seat. And the driving end of the servo motor is fixedly connected with a multi-module mounting seat. According to the new energy automobile battery aluminum alloy bottom shell impact test method, an acceleration mechanism on a base drives a driving frame to move at a high speed, a rotary driving seat is driven to impact a battery pack mounted in an automobile battery detection positioning mechanism, and a servo motor drives a multi-module mounting seat to rotate and locks a required model seat for impact test. Therefore, various impact working conditions possibly encountered by the battery bottom case in actual use are comprehensively simulated, and the diversity and accuracy of testing are ensured.

The present disclosure provides a prediction method of electrochemical and mechanical performances of a Solid Oxide Fuel Cell (SOFC) in a cold-hot cycle, and belongs to the technical field of SOFCs. In the present disclosure, a cold-hot cycle test is performed on SOFC pile, a polarization curve and an electrochemical impedance spectroscopy are measured by an electrochemical workstation, and contributions of different electrode reaction processes to voltage attenuation are analyzed quantitatively; the mechanical performance (bending strength, elastic modulus and hardness) after different numbers of cold-hot cycle services is tested, and based on change of Ni particles, the electrochemical performance and the mechanical performance of the SOFC pile are quantitatively associated; an attenuation coupling relationship of the electrochemical performance and the mechanical performance of the SOFC pile is disclosed and an attenuation theory model of the electrochemical performance and the mechanical performance of the SOFC pile is built. In this way, a change law of the electrochemical performance and the mechanical performance of the SOFC pile after different numbers of cold-hot cycles and a cold-hot cycle service life of the SOFC pile can be accurately predicted, which is of great significance to improve the thermal shock resistance of the cold-hot cycles of the SOFC pile, so as to promote SOFC commercialization applications.

The invention provides an impact deformation feature extraction method based on high-speed camera shooting and image processing, and the method comprises the steps: collecting the transient deformation data of the edge package of a remote controller housing under impact through high-speed camera shooting, recording the change speed of a strain rate, obtaining the material characteristics, the size of a package structure, and the geometric discontinuous features of an opening and closing part, generating continuous frame sequence images; performing strain field data quantification processing on the third visualization result, extracting strain field characteristic data, and judging influence weights of stress wave reflection on strain fields of different functional areas of the shell in combination with a falling height and an impact angle of the remote controller; and improving edge packaging design parameters according to the deformation buffer effect and discontinuous quantitative indexes at the opening and closing positions, verifying the improvement amplitude of the deformation buffer effect, and obtaining strain field distribution data of the optimized shell.

The invention provides a three-axis six-direction impact test simulation method and system based on an F-DEM, and the method comprises the steps: building a full-size model frame, coupling the F-DEM, carrying out the dynamic solving of a model, and carrying out the post-processing of automatic data. The invention further provides a triaxial six-direction impact test simulation system based on the F-DEM, a three-dimensional full-scale numerical model is established based on basic parameters of a waveguide rod and a rock sample in a TEHB test system, and the three-dimensional full-scale numerical model comprises a discrete element rock sample model and a finite element waveguide rod model. According to the method, efficient coupling modeling of the finite element waveguide rod and the discrete element rock sample is achieved, the method has good stress wave propagation precision, the dynamic response behavior of the rock sample under triaxial six-direction loading can be accurately simulated, and efficient and verifiable technical support is provided for impact response analysis and engineering application research of the rock mass in a complex stress environment.

The invention relates to the field of building material detection, and discloses a building material detection device for building construction, the building material detection device comprises a bottom plate and a supporting plate, a plurality of supporting rods are connected to the middle of the upper surface of the bottom plate, the top ends of the supporting rods are connected to the supporting plate, and the supporting plate is in an annular plate shape; a fixing frame is fastened to the edge of the left side of the upper face of the bottom plate through bolts, a detection structure is arranged on the fixing frame through a movable lifting structure, a rotary feeding structure is arranged on a supporting plate, and in the process that the movable lifting structure drives the detection structure to move up and down to detect building materials, the detection structure is matched with a driving structure; the detection structure can be automatically and intermittently driven to move in the horizontal direction, so that the anti-stamping detection is automatically performed on each position on the building material, the detection accuracy is improved, the operation is more labor-saving and convenient, and the detection working efficiency is improved.

The invention provides an arc-shaped microcrystalline glass plate structure performance detection system, and belongs to the technical field of material performance testing. The system comprises a rack, a sample table, an impact mechanism, a swing rod, a swing part, a driving assembly and a medium taking and supplying assembly, the sample table is provided with an arc-shaped supporting surface and a medium cavity; the impact mechanism is positioned above the arc-shaped supporting surface; the swing rod is provided with a sliding channel. The bottom end of the swinging piece is used for driving the sample table to rotate; the driving assembly comprises a rotating output shaft, a transmission arm and a transmission sliding block which are connected in sequence, the rotating output shaft is connected to the rack and is parallel to the rotating shaft of the swing rod, and the transmission sliding block is contained in the sliding channel in a sliding mode; the medium taking and supplying assembly comprises a piston barrel and a piston rod, the piston barrel is fixedly connected with the swing rod and provided with a one-way inflow port and a one-way outflow port communicated with the medium cavity, a piston of the piston rod is slidably sealed with the piston barrel, and a rod body is in transmission connection with the transmission sliding block. The system can realize multi-position and variable-temperature detection, and the detection reliability is higher.

The utility model discloses a thin film production detection device which comprises a roller fixing frame, a thin film is installed on the outer side of a roller, an electric telescopic rod is installed at the bottom end of an arc plate, a light source box is fixedly installed at the top end of a placing frame, an industrial camera is arranged over the light source box, and the industrial camera is connected with the electric telescopic rod. A quantitative conveying pump is fixedly installed at the top end of the corrosive liquid storage box, a liquid dropping box is installed at the tail end of a soft connecting pipe, detection can be carried out while a film is produced and conveyed, the thickness, transparency and surface defects of the film can be detected through cooperation of an industrial camera and a light source box, and the industrial camera is connected with a computer through a data line. The industrial camera can move back and forth, so that the film can be observed without dead angles, the arranged quantitative conveying pump is used for extracting detection liquid to be matched with a liquid dropping box to drop acid and alkali liquid on the film, and the industrial camera is matched with a computer to analyze information such as the corrosion resistance time and degree of the film.

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.

The utility model provides a coupling high-temperature and high-pressure small punch ammonia corrosion experimental device which is characterized in that a sample is clamped between an upper clamp (8) and a lower clamp (10) and is positioned in a heating furnace (6), and the experimental device introduces experimental mixed gas to the lower part of the sample (9) through a vertical channel in the lower clamp; the upper clamp is sequentially provided with a small punch (7) and a ball (5) which are used for applying pressure to the sample from top to bottom; the lower clamp is supported by a water cooling device below the lower clamp, and a stress sensor for detecting the stress of the sample is arranged below the water cooling device; the utility model has the advantages of simple structure, convenience in assembly, wide application range and higher stability.

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.

A bottom guard plate testing device for a battery pack is provided, which includes a pedestal and a test mechanism. The pedestal is configured to place a bottom guard plate, the pedestal is provided with a measuring recess, a pressure sensor or a plastically deformable member is arranged in the measuring recess, and a cushion block is arranged on the pedestal. The bottom guard plate and the pedestal are spaced apart by the cushion block to form an impact cavity, and the measuring recess is located in the impact cavity. The test mechanism includes a test bracket and an impact assembly, the test bracket and the impact assembly are arranged on one side of the pedestal, the impact assembly is suspended on the test bracket, and the impact assembly is located directly above the pedestal.

The utility model belongs to the technical field of composite material structure test, and discloses an axial compression test fixture, which comprises a base, two side support pieces, a first clamping assembly and an anti-instability assembly, the two side support pieces are oppositely arranged on the base, a composite material is arranged between the two side support pieces, and the anti-instability assembly comprises two first anti-instability pieces and two second anti-instability pieces. Each first anti-instability piece comprises two separated first abutting parts, the distance between the two first abutting parts is larger than the damage range of the side face of the composite material, the two first anti-instability pieces are arranged on the two sides, in the second direction, of the composite material and close to the impacted side face of the composite material, and the second anti-instability pieces correspond to the first anti-instability pieces in a spaced mode; the first anti-instability piece and the second anti-instability piece are fixed to the two side supporting pieces respectively. The first clamping assembly can clamp the top of the composite material. The axial compression test clamp can be used for clamping a composite material subjected to side impact, and the problem that the accuracy of compression test data obtained after the composite material is subjected to side impact is not high is solved.

The invention belongs to the technical field of aero-engine blade impact testing, and particularly relates to a multifunctional integrated box for aero-engine blade sandstone high-speed impact experiments. According to the technical scheme, the multifunctional integrated box body for the aero-engine blade sandstone high-speed impact experiment comprises a main box body, an integrated ammunition removing device, a heating module, a laser speed measuring device, a target box, a nitrogen conveying module and an observation device, and the integrated ammunition removing device is arranged on the upper right portion of the main box body; the heating module is arranged at the right lower part of the main box body, the target box is arranged at the left upper part of the main box body, and the nitrogen conveying module is arranged at the left lower part of the main box body; the laser speed measuring device is arranged between the integrated bullet removing device and the target box, and the observation device is arranged above the integrated bullet removing device. According to the invention, reasonable integration of all experimental functions is realized through modular design, and the aspects of structure optimization, space saving, operation efficiency, safety performance and environment control are remarkably improved.

The invention relates to the technical field of protection devices, and discloses a protection device and a test system.The protection device comprises a first barrier layer and a second barrier layer, and the first barrier layer is convexly provided with a plurality of first protrusions distributed at intervals; the second barrier layer is connected to one side, back to the first bulge, of the first barrier layer; the second barrier layer is filled with the first fluid, and the first fluid is the shear thickening fluid, so that the protection performance of the protection device can be improved.

An impact test device comprises: a liquid nitrogen tank; the output end of the liquid nitrogen tank is connected with the input end of the environment box; an impact test unit; the impact test part comprises a heat preservation box, a dip angle adjusting device and a clamping device, the dip angle adjusting device and the clamping device are both installed in the heat preservation box, the fixed end of the dip angle adjusting device is installed at the inner bottom of the heat preservation box, and the clamping device is fixedly installed at the rotating end of the dip angle adjusting device; the low-speed impact sample is placed at the rotating end of the inclination angle adjusting device and is clamped by the clamping device, and a hammer head channel is formed in the top of the heat preservation box and is arranged right above the low-speed impact sample; an environmental box; the cold output end and the heat output end of the environment box are communicated with the interior of the heat preservation box. Through cooperation of the liquid nitrogen tank, the environment box and the heat preservation box, sealing and heat preservation of the impact test environment are achieved, and tests of different impact angles can be simulated through cooperation of the inclination angle adjusting device and the clamping device.

The invention provides a consolidation test system and a consolidation test method, and relates to the technical field of road detection. The consolidation test system comprises a dynamic pore pressure test assembly, the dynamic pore pressure test assembly comprises a water source device, a dynamic pore pressure container part, a dynamic load displacement detection device and a dynamic load loading device, the dynamic pore pressure container part is provided with a pressurization cavity, a water inlet hole and a water outlet hole, the dynamic load loading device is provided with a load output end, and the load output end is arranged at the first end of the pressurization cavity in a sliding and penetrating mode; the load output end is matched with the pressurizing cavity in a dynamic sealing manner, the dynamic load loading device can apply a first load towards the second end to a soil sample in the pressurizing cavity, the water outlet hole is communicated with the second end of the pressurizing cavity, the water inlet hole is communicated with the first end of the pressurizing cavity, the water source device is communicated with the water inlet hole, and the dynamic load displacement detection device is connected with the load output end. Therefore, the displacement of the load output end is obtained. According to the invention, the key technical problems of soil consolidation characteristic test, permeability coefficient dynamic evolution rule analysis and the like under the dynamic load condition are solved.

The invention belongs to the technical field of structural material design, and particularly relates to a method for determining an allowable value of an aviation composite material structure. The method mainly comprises the following steps: correcting a tension-compression strength allowable value according to a first ratio of the breaking strength of a single-side lap joint tension-compression test to the breaking strength of a single composite material tension-compression test; a plurality of second ratios of the shear failure strength of the composite materials with different thicknesses to the shear failure strength of a single composite material are formed through bonding, and the shear strength allowable value is corrected; correcting the allowable value of the tensile strength according to a plurality of third ratios of the tensile breaking strength of the composite materials with different thicknesses formed by screw connection to the tensile breaking strength of a single composite material; and correcting the allowable value of the compression strength according to a plurality of fourth ratios of the compression breaking strength of the composite materials with different thicknesses after impact breaking to the compression breaking strength of a single composite material. A basis is provided for relatively reasonable, safe and effective design of the composite material structure.

The utility model discloses a convenient-to-adjust high-performance engineering plastic compressive impact resistance detection device, which comprises a mounting seat, a counterweight adjusting mechanism and a height adjusting mechanism, and is characterized in that the upper end of the front side of the mounting seat is rotatably connected with an upper swing arm, the lower end of the interior of the upper swing arm is slidably connected with a lower swing arm, and the middle of the interior of the lower swing arm is provided with a mounting groove; the counterweight adjusting mechanism comprises counterweight blocks, limiting grooves, gears and limiting blocks, the counterweight blocks are clamped in the guide grooves, the limiting grooves are formed in the right ends of the front and rear side walls of the counterweight blocks, and the three gears are rotationally connected to the interior of the mounting groove; the convenient-to-adjust high-performance engineering plastic compressive impact resistance detection device is provided with the pendulum bob capable of being rapidly adjusted, the falling speed can be adjusted by increasing or decreasing the balancing weights and rapidly fixing the balancing weights, and the falling speed and height can be rapidly adjusted by rotating the hand wheel and moving the sample seat.

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 invention relates to the technical field of packaging material detection, and discloses a novel heavy packaging bag falling test machine which comprises a frame mechanism, a rack, four footstand assemblies arranged at the bottom of the rack, a protective fence arranged on the outer side of the rack, a protective fence door arranged on one side of the protective fence and a protective fence lock arranged on the protective fence door. The guardrail safety switch is arranged on the guardrail door, and the height scale is arranged on one side of the rack. Through transmission of a chain wheel and a chain in the lifting assembly, rapid and accurate adjustment of the test height is achieved, the power assembly and the release assembly guarantee instantaneous release of a packaging bag and reliable reset of the device through a one-way meshing structure, flexible switching of vertical falling and flat falling tests is achieved through the erecting assembly, and the test efficiency is improved. The protective guard, the safety switch and other facilities not only guarantee the operation safety, but also provide a complete basis for test analysis, and significantly improve the efficiency, safety and diversity of the anti-falling performance test of the heavy packaging bag.

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.

The embodiment of the utility model provides an impact test composite tool which comprises a calibration device and a sample device. A sample piece mounting surface is arranged at the top of a calibration block, and a V-shaped groove is formed in the bottom of the calibration block; the sharp corner part of the V-shaped groove faces the top of the calibration block; the two anvil block abutting pieces are installed on the side face of the calibration block and symmetrically distributed with the center line of the V-shaped groove as the symmetry axis. When calibration is carried out, the posture is adjusted to enable the V-shaped groove to be horizontally arranged, then the anvil block is adjusted to enable the anvil block to abut against the abutting piece to complete calibration, and adjustment after measurement is not needed. When a sample test is carried out, the impact sample piece is connected with the calibration block through the sample piece mounting surface, so that the V-shaped groove is vertically formed, the calibration block after calibration and centering is adopted for fixing the impact sample piece, the calibration block is directly propped against the anvil block again, centering adjustment is not needed, the adjustment time is shortened, and the test efficiency is improved. The calibration block can be repeatedly used under different working conditions and is suitable for different sample pieces, and the efficiency is improved.

The utility model discloses an impact force test base, which comprises a base support, a sensor bottom plate arranged at the top of the base support, a sensor shell arranged at the top of the sensor bottom plate, a pressure sensor arranged in the sensor shell, and a pressure sensor arranged at the bottom of the pressure sensor on the sensor bottom plate. The top of the inner side of the sensor shell is provided with a sample lower tool, the sensor shell is provided with a strike column sleeve on the upper side of the sample lower tool, the center of the strike column sleeve is provided with an assembly hole, a strike anvil is arranged in the assembly hole, and a test sample is arranged between the bottom of the strike anvil and the top of the sample lower tool. According to the utility model, the test sample is separated from the pressure sensor, and axial constraint is provided, so that part replacement after oxidation of a metal piece contacted with the energetic sample is facilitated, impact force is all downward after axial constraint, the test result is accurate and reliable, the energetic sample is not contacted with the pressure sensor, the oxidation speed is reduced, and the test efficiency is improved. And the impact anvil, the test sample and the like are prevented from being axially splashed in an unconstrained manner after being impacted.

To provide a quality evaluation method enabling intensity of stone material which may deteriorate over time to be easily detected, and enabling such stone material to be reinforced if necessary.SOLUTION: There is provided a quality evaluation method comprising the steps of: acquiring stone material B as a sample, from a site; hitting a surface H of the stone material B by a hammer 1; measuring acceleration of the hammer 1 to the surface H and a hitting speed of the hammer 1; calculating intensity at the surface H from the hitting acceleration and the hitting speed; acquiring, relationship between a depth and intensity of the stone material B, by repeating, a step of calculating intensity while polishing the surface H; hitting the surface of the stone material B on the site by the hammer 1, thereby calculating intensity on the surface of the stone material B, and estimating intensity of a healthy portion of the stone material B on the site, from the relationship between the depth and intensity of the stone material B; and replacing at least a part of the stone materials B, if the estimated intensity is less than or equal to a prescribed threshold.SELECTED DRAWING: Figure 2

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 utility model relates to the field of test equipment, and discloses an impact testing machine, which comprises a frame body, a data reading assembly, a pendulum bob assembly, a limiting assembly and an alignment piece, a limiting groove is arranged in the limiting assembly along a first direction, a limiting step is formed in the limiting assembly along a second direction, and a test piece is arranged on the limiting step along the second direction. One side of the test piece abuts against the limiting step, and the test piece stretches across the limiting groove; the alignment piece is movably connected with the limiting assembly to form an alignment state and an impact state of the alignment piece; in the alignment state, the limiting assembly is located outside the limiting groove, the alignment piece is arranged above the limiting assembly in the second direction, the alignment piece stretches across the limiting groove, and the alignment piece is used for calibrating the position of the test piece; in the impact state, the alignment piece is arranged on one side of the limiting groove, and it is avoided that swinging of the pendulum bob assembly in the limiting groove is affected. According to the impact testing machine, the alignment piece is movably connected with the limiting assembly, and the alignment piece does not affect an impact test.