150 results about "Impact loading" patented technology

The invention relates to the technical field of bumper detection, in particular to an automobile bumper detection method and system, and the system comprises a rigid test bench, a multi-point adjustable impact loading module, a bumper surface deformation monitoring module, and a control and processing module. The to-be-tested automobile bumper is fixed on the test bench according to a preset mode, and the plurality of sensors are arranged based on a preset position; carrying out dynamic and static balance test on the to-be-tested automobile bumper according to the received control instruction, and carrying out corresponding index calculation; on the basis of static and dynamic test indexes, a quantitative report is generated, whether the balance of the bumper structure reaches the standard or not is automatically judged, complex static supporting and dynamic impact working conditions possibly encountered by the bumper on a vehicle can be effectively simulated in an integrated process, the static stability of the overall structure and the coordination under power impact of the bumper can be quantitatively evaluated, and the reliability of the bumper structure is improved. Therefore, the structural safety performance of the bumper can be reflected more truly.

The present invention belongs to the technical field of impact tests, and particularly relates to a catapult take-off and arrested impact test apparatus, comprising a supporting frame, an auxiliary supporting and guiding apparatus above the supporting frame, a mounting base below the supporting frame, a servo actuator, an oil circuit system, and a control and measurement system. The oil circuit system comprises an oil source, a low-pressure accumulator group, a high-pressure accumulator group, an oil inlet valve block, an oil return valve block, a servo valve block, an oil source low-pressure oil return pipe, an oil source high-pressure oil outlet pipe, and necessary tubes among components. The control and measurement system comprises a vibration and impact loading upper computer, a vibration impact controller, a static loading upper computer, a hydraulic servo controller, a servo valve, and an accelerometer. The servo actuator is internally provided with a displacement sensor. The present invention can be widely applied to conventional vibration and impact tests of various suspension launch apparatuses in a suspension-mounted state, as well as arrested impact tests under composite waveforms.

The utility model provides an anti-impact connecting bolt fastening structure of a high-voltage isolating switch, and relates to the technical field of high-voltage switches, the anti-impact connecting bolt fastening structure comprises a high-voltage isolating switch base and a switch anti-impact bolt connecting assembly, through bolts penetrate through the inner sides of base bolt holes, the lower side of a bolt head rubber mat is provided with a back shore spring, and the back shore spring is connected with the switch anti-impact bolt connecting assembly. A limiting sleeve is connected to the outer side of the jacking spring in a sleeving mode, a nut rubber mat is arranged on the lower side of the limiting sleeve, a connecting nut is arranged on the lower side of the nut rubber mat, a metal locking nut is arranged on the lower side of the connecting nut, and due to the effective buffering effect of a damping rubber mat, damage of vibration to the base is remarkably reduced, and the service life of equipment is prolonged; and through rotation of the penetrating bolt, rapid mounting and dismounting can be achieved, firm and reliable connection is ensured, and through adjustment of the fastening strength of the penetrating bolt, impact loads under different working conditions can be flexibly coped with, and stable operation of equipment is ensured.

The invention provides a dynamic strength test system and method for a soft rock biaxial Hopins compression bar, and the system comprises an axial impact loading unit which is used for generating an axial impact load; the confining pressure loading unit is used for applying radial confining pressure to the sample; the high-pressure fluid injection unit is used for injecting high-pressure fluid into the sample and simulating different internal water pressure and water saturation conditions; the data acquisition unit is used for recording impact load, confining pressure, internal water pressure and sample dynamic response data in real time; the control system is used for coordinately controlling the axial impact speed, the confining pressure and the internal water pressure value; by integrating the axial impact loading unit, the hydraulic servo confining pressure loading unit and the high-pressure fluid injection unit, a test platform capable of truly simulating a complex stress-seepage coupling environment where the deep soft rock is located is formed; therefore, the synchronous, independent and accurate control of axial dynamic load, constant or dynamic confining pressure and internal pore water pressure is realized.

The invention discloses a method for predicting the dynamic response of a corrugated steel-concrete combined arch shell under the action of an impact load, relates to the field of constructional engineering, and aims to solve the problem that a model for rapidly predicting the dynamic response of the corrugated steel-concrete combined arch shell under the action of the impact load is lacked in the prior art. Comprising the steps of 1, constructing a motion equation of a combined arch equivalent single-degree-of-freedom model; step 2, constructing equivalent model quality; 3, ignoring damping in the impact loading process, introducing the influence of the damping in the unloading stage, and constructing system damping in the equation; 4, describing the dynamic response of the combined arch under the action of the impact load by adopting an ideal double-broken-line resistance function, and constructing a resistance function; 5, the deformation rigidity in the equation is constructed through deformation decomposition of the combined arch; and 6, solving the motion equation of the equivalent single-degree-of-freedom model of the combined arch by combining the steps 2-5, and predicting the deformation of the combined arch under the action of the impact load.

The invention relates to the field of underground engineering, and discloses a rapid automatic comprehensive detection method for an urban road underground cavity, which comprises the following steps: S1, carrying out rapid general survey scanning on a road through a vehicle-mounted ground penetrating radar system to obtain an underground B-scan image of the road, processing a radar image by using a deep learning segmentation model, and outputting a cavity probability graph, identifying a suspected cavity area; s2, automatically positioning a suspected area; s3, starting signals are transmitted to the seismic wave sensor array and the ground penetrating radar controller at the same time; s4, performing fusion processing on the pavement elasticity modulus subjected to FWD inversion; and S5, a spatial interpolation algorithm based on the digital twinborn model. Through hardware-level cooperative control of impact loading and multi-source sensing, a five-dimensional synchronous controller triggers working mode switching of a seismic wave array and a ground penetrating radar, time-space alignment is carried out, and equipment response time difference and mechanical vibration interference are eliminated, so that rapid and accurate detection of the underground cavity of the road is ensured.

The invention belongs to the technical field of impact fatigue tests of metal materials, and relates to an impact fatigue test system for simulating a working condition environment of a gun firing pin, which can perform high-frequency cyclic loading of 200MPa-500MPa, microsecond (mu s) level impact pulse and more than kilohertz (kHz), and synchronously simulate the working condition environment. High-energy, high-frequency and short-pulse impact loading under the gun and gun firing pin working condition is carried out through the high-frequency impact generation subsystem, and the dynamic mechanical environment in actual service is effectively simulated; the environment simulation subsystem is used for accurately controlling the temperature, the concentration and the pH value of media such as salt mist and seawater, and is synchronously coupled with mechanical shock, so that mechanical-electrochemical synergistic damage conditions are truly represented; dynamic stress, strain, electrochemical parameters and surface topography in the impact process are synchronously monitored through a multi-parameter synchronous acquisition subsystem, and complete data support is provided for researching the damage evolution law of a material under a complex load; the repeatability and the safety of the test are ensured through the modularized sample clamp subsystem and the dynamic sealing design.

The invention discloses a drop hammer device for an impact performance test of an unmanned aerial vehicle body structure and a test method.The device comprises an impact force measurement test platform, an impact loading test platform and a multi-stage electric hydraulic telescopic rod, and the impact force measurement test platform is located above the impact loading test platform; the multi-stage electric hydraulic telescopic rod is mounted between the impact force measurement test platform and the impact loading test platform; the method comprises the following steps: S1, installing a drop hammer device and adjusting an impact loading test platform; s2, mounting and testing a tested object of the unmanned aerial vehicle; and S3, test recording. According to the drop hammer device for the impact performance test of the unmanned aerial vehicle body structure and the test method disclosed by the invention, the device can adjust the test positions of unmanned aerial vehicle tested objects with different shapes and specifications at high precision, solves the problem that centers of the three objects are coaxial, and can meet different drop hammer test conditions; the method is used for evaluating the collision safety of the civil light and small unmanned aerial vehicle with the maximum takeoff weight of about 0.25 kg-25 kg.

The invention relates to the technical field of hub bearings, in particular to a hub bearing. The hub bearing comprises an outer ring unit, an inner ring unit, a rolling body, a first dynamic sealing unit and a second dynamic sealing unit. The outer ring unit comprises an outer ring main body and a threaded connection part; the inner ring unit comprises a first inner ring and a second inner ring; the first inner ring comprises an inner ring main body and a flange; the flange and one axial end of the inner ring main body are integrally formed; the inner ring main body and the second inner ring are positioned in the outer ring main body; the end face, facing the flange, of the outer ring body is a first collision face. The end face, facing the outer ring body, of the flange is a second collision face. A movable gap is formed between the first collision surface and the second collision surface; when the axial acceleration of the inner ring unit is 0, the movable clearance is 0.3-0.5 mm; the movable gap is gradually reduced in the direction away from the axis of the hub bearing. Therefore, the problems that the rolling body is subjected to impact loading force for a long time, so that the raceway is subjected to dent deformation, and abnormal sound is generated are solved.

The invention relates to the technical field of material dynamic performance detection, and discloses an aggregate anti-crushing capability detection method and device based on impact vibration spectrum analysis, and the method comprises the following steps: collecting a vibration signal generated when an aggregate is impacted; performing dynamic wavelet packet decomposition on the vibration signal and selecting an optimal decomposition layer number; constructing a time-frequency-space three-dimensional tensor feature space based on a dynamic wavelet packet decomposition result; inputting the three-dimensional tensor into a depth measurement learning model to evaluate the crushing resistance; driving an adjustable mass impact clock and a precise lifting mechanism to adjust impact parameters according to an evaluation result; and performing signal processing and model calculation in the steps S2 to S4 in real time. According to the invention, through dynamic impact loading and full-process automatic control, a traditional static detection mode depending on manual operation is changed; multi-band vibration characteristic analysis is combined with a deep metric learning model, a plurality of frequency spectrum parameters and acoustic emission parameters can be synchronously extracted, a multi-dimensional evaluation system is constructed, and the comprehensiveness and scientificity of detection indexes are remarkably improved.

The invention relates to the technical field of shield cutter tests, and discloses a test device for simulating a damage behavior under the impact and cutting action of a shield hob, the test device comprises a shell, an impact loading assembly, a cutter mounting table, a horizontal moving assembly, a sample clamping assembly and a collecting assembly, the impact loading assembly is arranged at the top of the shell, and the cutter mounting table is arranged on the shell; the tool mounting table is arranged at the bottom of the impact loading assembly, a first tool apron is arranged on the side wall of the tool mounting table, the horizontal moving assembly is arranged in the shell, and the sample clamping assembly is arranged on the surface of the horizontal moving assembly; coherent actions of impacting and cutting are realized by laterally mounting the hob, interference is avoided by combining with an adjustable structure of a sample position, and by matching with multi-dimensional data acquisition, actual working conditions of the hob under complex geology can be accurately simulated, and stress response and damage evolution characteristics of the hob are comprehensively captured. Key support is provided for optimizing cutter design, improving tunneling reliability and reducing construction risks, and the limitation of an existing single loading or static test is effectively made up.

The invention relates to a gob-side entry driving small coal pillar dilatation deformation test system and method under simulation of dynamic and static loads, and belongs to the technical field of coal pillar dilatation deformation test. The system comprises a bearing frame unit, an axial pressure loading unit, a constraint frame unit, an impact loading unit, a monitoring unit and a controller, the axial pressure loading unit is arranged at the bottom of the bearing frame unit, the constraint frame unit is arranged on the upper side of the axial pressure loading unit, and the impact loading unit is arranged at the top of the bearing frame unit. The bearing frame unit is provided with a monitoring unit, the monitoring unit is connected with a data collector, and the data collector, the axial pressure loading unit and the impact loading unit are all connected with a controller. Different rotation angles of the gob-side entry driving lateral top plate are simulated, independent or synchronous application of the gradient load and the impact load on the top of the coal sample is realized in the axial direction, the test operation is simple, and the test accuracy is high.

The invention provides an island micro-grid composite energy storage optimal configuration method and device, and the method comprises the steps: building an island micro-grid simulation model containing multiple types of impact loads based on the actual operation data of an island micro-grid containing multiple types of impact loads, and carrying out the simulation analysis, and obtaining a simulation result; constructing an island micro-grid composite energy storage optimal configuration model containing multiple types of impact loads; based on the simulation result, solving the island micro-grid composite energy storage optimal configuration model to obtain a target configuration result; and carrying out effect evaluation on the target configuration result to obtain an evaluation result, and carrying out island microgrid composite energy storage optimization configuration based on the evaluation result. According to the method, the influence of the impact load on the operation of the micro-grid is effectively considered, the reliability of power supply of the island micro-grid containing multiple types of impact loads can be effectively improved, and a technical basis and a practical method are provided for the operation and control of the island micro-grid containing multiple types of impact loads; implementation is easy, and arrangement is convenient.

The invention discloses a high-speed cross-medium projectile body vertical water entry impact overload / load reduction response characteristic test device and method, belongs to the field of projectile body cross-medium high-speed flight impact tests, and aims to solve the problem of how to give consideration to reduction of impact load borne by a projectile body during cross-medium motion and reduction of self weight. The device comprises an underwater shock wave emitter, a projectile body, a test system and the like. The underwater shock wave generator is composed of a light-gas gun launching tube, a sabot flying plate, a piston, a dynamic pressure sensor and the like. The projectile body is divided into a buffer cap and a non-buffer cap; the test system is composed of a dynamic strain gauge, an axial acceleration sensor, a radial acceleration sensor, a three-dimensional DIC system and the like. According to the invention, different impact wave intensities in water are used for simulating conditions of vertical entry into water at different speeds, impact waves directly act on the front end face of the projectile body to realize impact loading on the projectile body, and the test system is used for realizing research on impact overload / load reduction response characteristics of the projectile body.

The invention provides a coal body strain synchronous in-situ monitoring device and method based on true triaxial impact, and relates to the field of coal body dynamic testing and structural damage monitoring. Comprising a sample bearing module, an impact loading module, an internal fiber bragg grating dynamic strain monitoring module, a surface strain gauge monitoring module, a synchronous data acquisition module, a microscopic crack detection module and a macroscopic failure analysis module, the impact loading module is used for applying a transient impact load with a set impact speed to the gas-solid coupling coal sample, and the internal fiber bragg grating dynamic strain monitoring module is embedded with at least one fiber bragg grating sensing grating point along three mutually orthogonal directions of the gas-solid coupling coal sample respectively. The damage evolution mechanism of the gas-solid coupling coal body under the high strain rate condition is disclosed, and a means is provided for risk analysis of the rock burst-coal and gas outburst hybrid power disaster.

This invention provides a multi-field coupled shear testing device, including a test host, a pressure chamber, a power distribution cabinet, and a water supply device. The test host is supported by a workbench. The confining pressure chamber, together with the vertical, horizontal, and longitudinal loading systems, applies a three-dimensional static load. Within the horizontal loading system, an impact transmission rod connects to a nitrogen high-pressure emission chamber to achieve impact loading. The sealed high-temperature chamber has a vacuum glass window on the outside, and the internal shear box chassis is raised and equipped with water channels. A membrane is used to wrap the specimen to prevent leakage. The vertical loading system has a built-in cooling device, and an acoustic emission probe is installed on the pressure rod to monitor damage in real time. This device achieves multi-field coupling of high temperature, high pressure, seepage, and impact through modular design, offering high loading accuracy and convenient operation. It solves the functional conflicts and monitoring lag problems of traditional equipment and is suitable for multi-field mechanical property testing of geotechnical materials.

The utility model provides a cradle structure for a machine gun weapon station. The cradle adopts a double-trunnion-hole groove-shaped structure, a trunnion hole is formed in the side wall of one end, and a guide rail is fixedly connected to the other end in a groove. The sliding base is installed on the guide rail and can slide along the guide rail, weapon installation structures are arranged at the first end and the second end of the sliding base respectively, the first end is closer to the trunnion hole of the cradle than the second end, and the protruding block in the middle of the guide rail is located between the first end and the second end. One end of the buffer rod is connected to the bump of the guide rail, and the other end is connected to the second end of the sliding seat. The buffer spring can buffer forward impact and recoil force generated when a weapon is shot, and the buffer rod is sleeved with the portion, between the protruding block and the second end, of the buffer spring. The buffering device is compact in structure, the buffering device can be provided for a small-caliber weapon without an external buffering device, so that the weapon rushes forwards and sits backwards in the shooting process, meanwhile, the spring buffers the impact load, and the stress of the trunnion and the bracket can be reduced to protect the trunnion and the bracket.

The invention belongs to the technical field of coal rock mechanical property testing, particularly relates to a mechanical testing device and method for coal rock loading, and solves the problems that an existing device is single in function, fragments splash, cleaning is inconvenient, and protection and cleaning are not linked. The device comprises a supporting mechanism, and a modular loading mechanism is detachably mounted on the supporting mechanism and comprises a static extrusion loading module and a dynamic impact loading module; the linkage type protection mechanism is provided with two protection half barrels, and fragments can be prevented from splashing when the two protection half barrels are closed; the sweeping mechanism is started when the protective half barrels are unfolded, a rotating ring drives a Z-shaped plate to rotate, an annular inclined panel is driven to vibrate, and fragments are swept; the device integrates a static extrusion function and a dynamic impact function, so that the equipment utilization rate and the application range are improved; protection and cleaning are linked, safety is guaranteed, cross contamination is avoided, and the experiment accuracy and efficiency are improved.

The invention discloses a power battery anti-explosion performance detection system and method and a storage medium, an impact loading module in the system is connected with a battery mounting mold, and a metal foil included in the impact loading module generates electric explosion through instantaneous pulse current output by a high-voltage pulse power supply unit to generate impact waves; the shock wave pushes the flyer to realize ultra-high-speed impact on the power battery; and the information acquisition module is used for acquiring the impact information and obtaining a detection result of the explosion-proof performance detection based on the impact information. According to the invention, the ultra-high-speed impact possibly suffered by the power battery in an actual application scene can be simulated, and an extreme and real test environment is provided for the power battery, so that the accuracy of a detection result of explosion-proof performance detection is improved.

This utility model relates to the technical field of single-end mechanical seal structures. It provides a balance-free single-end mechanical seal structure suitable for high-pressure and high-temperature environments, comprising a stationary ring, a rotating ring, and a spring-loaded seat. The stationary and rotating rings slide tightly against each other at their opposite ends. The spring-loaded seat is pressed against the top of the rotating ring. The spring-loaded seat includes a rotating ring positioning ring and a locking ring. The rotating ring positioning ring is engaged with the lower end face of the rotating ring, and the locking ring is locked onto the shaft to be sealed and rotates with it. Elastic connecting elements are provided at four positions (front, back, left, and right) between the locking ring and the rotating ring. Four damping connecting pads are also provided between the locking ring and the rotating ring. The four damping connecting pads and the four elastic connecting elements are staggered around the center of the locking ring. This mechanical seal structure, through the organic combination of elastic connecting elements and damping connecting pads, not only improves the elastic compensation and sealing performance between the rotating and stationary rings but also effectively alleviates the impact load caused by sudden pressure changes or mechanical vibrations.

The utility model relates to a silver ingot weighing buffer device. According to the silver ingot weighing buffer device, electric push rods are arranged on the two sides of a weighing instrument, a lifting table is installed on the electric push rods, a window is formed in the middle of the lifting table and located over the weighing instrument, and connecting rods are installed on the inner sides of the four edges of the window in the middle of the lifting table; the bearing table is installed on the connecting rod and can slide on the connecting rod, the height of the bearing table is larger than the thickness of the lifting table, and when the electric push rod drives the lifting table to descend, the bearing table firstly makes contact with the weighing instrument. According to the scheme provided by the invention, the bearing table can be supported through the electric push rod, the lifting table and the connecting rod, the silver ingot and the bearing table are slowly descended to the weighing instrument through the electric push rod through vibration and impact force generated when the bearing table bears the silver ingot, and the lifting table, the connecting rod and the bearing table are separated to complete weighing; vibration and impact force generated when the silver ingot is placed are effectively isolated, and the problem that impact load directly acts on the sensor is solved.

This invention discloses an impact device and method for simulating primary impact injury from an explosion. The impact device includes: a driving system comprising a driving gas chamber storing high-pressure gas; an experimental system comprising an experimental section cavity with an animal restraint device positioned at its center, the experimental section cavity receiving high-pressure gas from the driving system to apply impact loading to the animal restrained by the animal restraint device; a valve connecting the driving system and the experimental system, the valve's opening time being controlled to regulate the gas pressure within the experimental section cavity (milliseconds); and a throttling valve at the end of the experimental system, the throttling valve's opening angle being set to release the high-pressure gas within the experimental section cavity, thereby achieving the desired shock wave pulse width and waveform. This invention features a simple structure, safe operation, and minimal site requirements; the ideal shock wave pulse width and peak can be set via valve switching and the throttling valve.

The invention belongs to the technical field of pendulum bob tests, and particularly relates to a pendulum bob type lateral impact test device capable of adjusting the impact direction in multiple degrees of freedom, which comprises a base, a mechanical arm mounted on the base, a small arm fixedly mounted at the movable end of the mechanical arm, and a U-shaped frame fixedly arranged at the other end of the small arm, a U-shaped frame is arranged on the upper portion of the arc-shaped track, a chain wheel is rotationally installed in the U-shaped frame, a chain is connected to the chain wheel in a meshed mode, the lower end of the chain is fixedly connected with a pendulum bob, the other end of the chain is wound on a roller of a first winch, and the first winch is fixedly installed on the small arm. The azimuth angle and the pitch angle of the pendulum bob can be quickly and accurately adjusted, so that the pendulum bob can realize repeatable impact loading under different incident angles, different transverse offsets and different spatial orientations, and the target energy level hit rate and the test repeatability are remarkably 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.

The invention provides a device for a composite material stringer skin interface out-of-plane soft body impact test, and relates to the technical field of impact tests, the device for the composite material stringer skin interface out-of-plane soft body impact test comprises an impact loading assembly, a fixed supporting assembly and a clamping assembly; the number of the clamping assemblies is two, and the two clamping assemblies are arranged on the fixed supporting assembly in the first direction in a spaced mode. The clamping assembly comprises a base, a rotating shaft, a lever, a spring and a clamping piece; the base is connected with the fixed supporting assembly. The rotating shaft is rotationally connected with the base and can rotate around the axis of the rotating shaft; one end of the lever sleeves the rotating shaft, and a spring is arranged between the other end of the lever and the base; the clamping piece is detachably connected with the rotating shaft so as to cooperatively clamp a test piece; the impact loading assembly is arranged above the clamping assembly, and the impact loading assembly can apply an out-of-plane impact load to the test piece. The out-of-plane impact loading test of a composite material stringer skin test piece can be realized, and the failure mechanism of a stringer skin interface in the process that a composite material fuselage bears an out-of-plane impact load is studied.

The invention discloses a gas-containing coal dynamic experiment system and method with controllable impact frequency and equivalent weight, and relates to the technical field of coal seam mining, and the gas-containing coal dynamic experiment system comprises an intelligent servo control driving device, a guide rail, a slide rail, a punch carrying device, a spindle-shaped punch, a steel impact gasket, an incident rod, a transmission rod, an absorption rod and a multi-field coupling experiment device, the intelligent servo control driving device intelligently controls a sliding rail installed on the guide rail through program assignment so as to drive the punch carrying device and the spindle-shaped punch in the punch carrying device to do reciprocating motion, the steel impact gasket can be impacted at different impact frequencies and equivalents, and the central axis of the steel impact gasket, the central axis of the incidence rod, the central axis of the transmission rod and the central axis of the absorption rod are collinear. Through the intelligent servo control driving device, the impact loading frequency and the impact equivalent can be automatically adjusted through program control, the preset impact parameters can be output, the accuracy and the consistency of impact loading are improved, and the experiment requirements under different impact conditions are met.

Provided is a frame member for a vehicle that, when an impact load is input, easily absorbs the desired impact load by being uniformly compressed in the axial direction. A vehicle frame member (2) extending in the front-rear direction includes: a frame body portion (20A) having a closed cross section (7a) formed by an upper wall portion (20a), a lower wall portion (20b), and a pair of side wall portions (20c, 20d) in a cross section orthogonal to the extending direction within a predetermined front-rear direction range; groove parts (25, 26) formed by the pair of side wall parts (20c, 20d) which are recessed towards the inner side of the closed cross section (7a); and flanges (20e, 20f) protruding outward from the closed cross-section (7a), the pair of side wall portions (20c, 20d) being provided with a plurality of side wall portions defining the groove portions (25, 26) and having groove upper wall portions (25a, 26a), groove lower wall portions (25b, 26b), and groove bottom wall portions (25c, 26c), and the plurality of side wall portions being formed so that the bending rigidities thereof are substantially equal.

An impact loading test device with gas-solid coupling function includes an impact test device, a drilling machine, and a coupling machine. The impact test device performs an impact test on the sample in the coupling machine through an incident rod and a transmission rod; the drilling machine is used to drill holes in the sample in the coupling machine; the coupling machine is used to apply confining pressure and gas coupling tests to the sample; the impact test device and the drilling machine are respectively located at two workstations, and the coupling machine moves to adapt to the two workstations to perform impact testing and drilling. The present invention can apply confining pressure to the sample around the periphery through hydraulic oil, and can apply pressurized gas to one end of the sample, and detect gas concentration or drill holes on the other end, so as to relatively realistically restore the actual stress environment of the coal rock, and strive to obtain relatively accurate parameters of the coal rock under this condition. In addition, after applying confining pressure, gas coupling, and drilling, the sample can be subjected to an impact test to further study the performance of the sample under this environment.

This invention relates to the field of functionally graded materials, specifically to a multidimensional gradient composite material structure and its design method for high-speed impact loading. The composite material structure includes a main body composed of multiple material gradients, a function-controlled outer edge slope, and a bottom high-density layer. By adjusting the side pressure distribution and enhancing the central pressure through the high-density layer, the deformation of the homogeneous material under high-speed loading is effectively reduced, with a maximum deformation ≤0.06mm, and the launch velocity is increased, with a central final velocity ≥13km / s. This invention is applicable to three-stage lightweight gas gun loading technology, providing high-precision data support for protective material research in aerospace and planetary science fields.

The present invention relates to a method for constructing a rock crushing damage model under impact loading and its application, belonging to the field of rock engineering, and solving at least one of the problems of existing rock models in predicting the failure evolution law and / or strength under direct impact loading, namely, insufficient reliability and accuracy, and difficulty in revealing the change law under direct impact loading. The method comprises: S1, based on the wing crack propagation model, obtaining a tension damage model under quasi-static loading; S2, introducing a correction factor to correct the tension damage model under quasi-static loading, and obtaining an expression for the tension damage model under direct impact loading; S3, determining the dynamic fracture toughness of the rock; S4, determining the correction factor; S5, constructing a tension damage model under direct impact loading. The present invention enhances the accuracy and reliability of the model in predicting the strength and failure evolution law of rock under direct impact loading, and the obtained model can reveal the quantitative change law of the damage and destruction of rock under direct impact loading.