93 results about "Compressive test" patented technology

The invention discloses a test device for measuring the compression strength of a composite material plate, which comprises an upper box body and a lower box body, a guide column is arranged between the upper box body and the lower box body, an upper clamping assembly is arranged at the lower end of the upper box body, a lower clamping assembly is arranged at the upper end of the lower box body, and the upper clamping assembly and the lower clamping assembly have the same structure and opposite installation directions. The upper clamping assembly or the lower clamping assembly comprises two wedge-shaped clamping block units which are oppositely arranged, and the end part of the test piece is clamped between the two wedge-shaped clamping block units. The invention also discloses a test method for measuring the compression strength of the composite material plate. The test device can stably work for a long time in high and low temperature environments, meets the test requirements of a compression test, adopts a split design, is rapid in clamping, can effectively resist bending and torsional deformation, improves the test efficiency and accuracy, keeps reliable clamping all the time in the test process, and is simple in structure and convenient to operate. And the problem of clamping failure caused by thermal expansion and cold contraction is effectively solved.

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 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.

This invention proposes a simulation material for mechanical testing of press-loaded explosives, which, by weight, is made from the following raw materials: 65.5% ammonium sulfate, 27%–33% aluminum powder, 1.5%–4% microcrystalline wax, 1%–2% butadiene rubber, and 0.2%–0.8% graphite. The compressive and tensile strengths of the explosive charge formed by this simulation material are essentially consistent with those of the charge charge formed from polyaluminum black-2 (JHL-2) explosive. It can realistically reflect the trend and limit of strength changes during mechanical testing, and provides effective reference data for mechanical performance evaluation. It also provides relatively realistic and reasonable model parameters for the digital design of the mechanical properties of press-loaded explosives. In aging tests, tensile tests, mechanical compression tests, and dynamic Brazilian tests, using this simulation material avoids contact with energetic explosive components, increasing test safety and reducing safety hazards.

The utility model discloses an endurance test device for a dust cover. The endurance test device comprises a rack, a first telescopic device and a second telescopic device, a placing plate is arranged in the middle of the rack, and the first telescopic device and the second telescopic device are mounted above and below the placing plate respectively; the second telescopic device is suitable for upwards penetrating through the placing plate so as to be used for positioning and sleeving the dustproof cover to be tested; and the first telescopic device is suitable for pressing the top of the positioned dust cover downwards and driving the dust cover to be subjected to repeated compression deformation relative to the placing plate through reciprocating motion. The dustproof cover testing device has the beneficial effects that compared with an existing dustproof cover testing device, the dustproof cover testing device can effectively test the dustproof cover in the folding resistance aspect. And a high-strength compression test can be performed on the dust cover through the first telescopic device and the second telescopic device, so that whether the dust cover is folded or not is subjected to a high-strength test.

The invention relates to a metal material strain rate effect measurement method based on multiple stress relaxation, which comprises the following steps: carrying out a standard quasi-static stretching or compression test on a material sample at a constant strain rate to obtain a stress-strain curve; analyzing a strain range according to a stress-strain curve, and determining a stress relaxation frequency N to be developed and a corresponding relaxation strain value sequence epsilon i, i = 1... N; a material sample is taken to be subjected to a tensile or compression test at a set strain rate, stress relaxation lasts for relaxation time delta t when the strain sequentially reaches values in each relaxation strain value sequence, and after each stress relaxation, the tensile or compression test is performed according to the set strain rate; obtaining a stress-plastic strain rate curve corresponding to each relaxation strain epsilon i; and obtaining a stress-strain curve corresponding to each strain rate. Stress-strain curves corresponding to different plastic strain rates in a quasi-static range can be obtained through a single sample.

The invention provides a portable multifunctional rock mechanics testing machine and method, and relates to the technical field of rock mechanics tests. According to the portable multifunctional rock mechanics testing machine, an expansion test assembly, a uniaxial compression test assembly, a point load test assembly, an indentation test assembly or a compression-shear test assembly are selectively arranged between a telescopic rod of a loading oil cylinder and / or a force transducer. The testing machine disclosed by the invention is simple and light in structure, and can be conveniently carried to an engineering site to carry out a rock mechanical test, so that on-site loading and data acquisition of a rock sample are realized; the tester can accurately control stress and strain conditions and can realize stable and uniform loading and unloading on site so as to obtain a reliable test result; the testing machine integrates multifunctional testing, and different testing assemblies are matched with an expansion test, a uniaxial compression test, a point load test, an indentation test or a compression-shear test, so that multi-parameter testing is realized aiming at different rock sample conditions.

The utility model provides a kind of cord fabric pressure test device, the lower part of the clamp is provided with compression testing machine platform, the upper part of the clamp is provided with down device, the clamp includes clamp main body, the lower part of the clamp main body is provided with connecting flange, connecting pin passes from the inside of connecting flange, the clamp main body is surrounded with cord fabric, large clamp piece is installed in the both sides of the cord fabric, the large clamp piece is fixed in the clamp main body with cord fabric, small clamp piece is installed in the both sides of the upper side of the cord fabric, the small clamp piece is compacted in the upper side of cord fabric, spring is installed between the large clamp piece and clamp main body, the top of the clamp main body is provided with pressure head, connecting pin passes from the top of pressure head;The utility model can make contrastive analysis to data by a series of standardization test to cord fabric, prevent the risk of structural failure in advance, to reduce the risk of tire burst.

The utility model discloses a composite material compression test piece positioning tool which comprises a positioning block assembly, the positioning block assembly comprises an upper positioning block and a lower positioning block, and opposite plate surfaces of the upper positioning block and the lower positioning block are respectively provided with positioning raised lines corresponding to an upper notch and a lower notch; reinforcing sheet placing areas are respectively formed on two sides, corresponding to the positioning raised lines, of the upper positioning block and the lower positioning block; the baffle assembly comprises a left side baffle and a right side baffle, and the left side baffle and the right side baffle are arranged on the left side and the right side of the positioning block assembly respectively and connected with the upper positioning block and the lower positioning block through fasteners respectively; the positioning pin assembly comprises a plurality of positioning pins, a plurality of vertically corresponding positioning grooves are formed in the front ends and the rear ends of the upper positioning block and the lower positioning block respectively, and the positioning pins are inserted into the corresponding positioning grooves. According to the utility model, the symmetry of two reinforcing sheets is ensured, the stability of the reinforcing sheets in the positioning process is ensured, and the precision of a test piece is improved.

The utility model discloses an expandable compression testing machine, and relates to the technical field of compression testing machines. The device comprises a bottom plate, a compression mechanism is arranged on the bottom plate, the compression mechanism comprises a [-shaped frame fixedly connected to the top of the bottom plate, an electric push rod is fixedly connected to the top of the [-shaped frame, and an output shaft of the electric push rod extends into the [-shaped frame and is in sliding connection with the [-shaped frame. Accurate control over the moving path of the hold-down device in the compression process can be achieved through the compression mechanism, the possibility that the hold-down device deviates in the operation process is fundamentally eradicated, the accurate control enables the hold-down device to be kept highly stable in the moving process, and therefore when pressure is applied to a sample piece, the sample piece is not prone to deviation. The pressure can be ensured to uniformly and accurately act on the sample piece, the test error caused by non-uniform pressure or deviation is effectively avoided, the reliability and precision of the test result are remarkably improved, and more valuable data support is provided for scientific research and production.

The invention relates to a set of mold for preparing a specific-density to-be-tested sample in a triaxial compression test, and belongs to the field of geotechnical engineering sample devices.The mold comprises a pressing and clamping assembly, a forming assembly is arranged in the pressing and clamping assembly, and a pressure applying assembly is slidably connected to the pressing and clamping assembly; the bottom end of the pressure applying assembly extends into the forming assembly to apply pressure to a sample located in the forming assembly, a functional ring is arranged at the end of the pressing and clamping assembly, and the functional ring abuts against the end of the pressing and clamping assembly. According to the invention, the operation process is simplified, the efficiency and safety of taking out the sample are improved, and the preparation work of the sample can be completed more efficiently and accurately, so that the quality and efficiency of a triaxial compression test are improved.

The utility model discloses a device for a wave spring compression test, which relates to the technical field of wave spring compression tests and comprises a bottom support, a longitudinal driving portal frame fixedly mounted at the upper end of the bottom support, a moving plate mounted on the longitudinal driving portal frame, and an extrusion component fixedly mounted on the moving plate. The extrusion assembly is composed of a connecting rod and an extrusion plate, three notch grooves are formed in the extrusion plate, the limiting measurement assembly, the adjusting assembly and the supporting assembly are arranged, wave springs of different diameters can be limited and blocked, and therefore when the wave springs of different diameters are tested, horizontal movement of the wave springs can be avoided, and the test accuracy is improved. Therefore, the smooth operation of the compression test of the wave spring can be ensured, and meanwhile, when the recovery capability of the wave spring under different compression degrees is measured, the recovery capability of the wave spring can be directly observed through the scales on the baffle without the help of external equipment, so that the measurement efficiency can be improved.

The utility model relates to the technical field of geopolymer-foundation concrete combined test piece tests, in particular to a loading device for a tension and compression test of a geopolymer-foundation concrete combined test piece, which comprises a testing machine body, a test piece is arranged on a bottom supporting plate of the testing machine body, a top pressing plate is arranged right above the bottom supporting plate, and a top pressing plate is arranged right above the top pressing plate. The vertical surfaces of the bottom supporting plate and the top pressing plate are square; the loading device further comprises two right-angle plates and a driving part for driving the two right-angle plates to be synchronously close to or away from each other, and the direction in which the two right-angle plates are synchronously close to or away from each other is parallel to the diagonal line of the square surface of the bottom supporting plate; the maximum value of the distance between the two right-angle plates is larger than the length of the diagonal line of the square surface of the top pressing plate. According to the utility model, the test piece is ensured to be positioned at the central position of the bottom supporting plate during each test, so that the eccentric compression of the test piece is effectively avoided.

The application discloses a high-temperature SHPB dynamic compression test device, wherein a gas gun and a heating furnace are fixed on a rack, an incident rod and a transmission rod are arranged on the two sides of the heating furnace, strain gauges are attached to the incident rod and the transmission rod, a sample is arranged in the heating furnace, a plurality of fasteners are fixed on the rack and arranged on the two sides of the heating furnace, the incident rod and the transmission rod are fixed on each group of fasteners, two locking blocks are fixed on the incident rod and the transmission rod, two driving members are slidingly connected to the rack and can be horizontally rotated, driving blocks are arranged on the driving members, the two driving members are driven to linearly displace by an electric driving mechanism arranged on the rack, the driving blocks abut against the corresponding locking blocks to drive the incident rod and the transmission rod to linearly displace towards the heating furnace during the linear displacement of the driving members, and the driving members are horizontally rotated by 180 DEG, so that the incident rod and the transmission rod linearly displace away from the heating furnace. The application solves the problem of long test time and influence on test results caused by manual push rods in the traditional device.

The present application relates to the technical field of clamp loading and unloading, and particularly relates to an automatic loading and unloading system and method of a hole compression test clamp. In the system, a positioning mechanism, a discharging mechanism, a gripper and a mechanical arm are included, the mechanical arm is used to drive the gripper to clamp the hole compression test clamp with a test piece; the hole compression test clamp includes two long clamping plates, two short clamping plates and two support plates, one long clamping plate, one short clamping plate and one support plate are fixed to each other through fasteners, the other long clamping plate, the other short clamping plate and the other support plate are fixed to each other through fasteners, and the two long clamping plates and the two short clamping plates are used to clamp the test piece made of fiber composite material; the positioning mechanism is used to position the hole compression test clamp by abutting against the side surfaces of the long clamping plates and the short clamping plates; and the discharging mechanism is used to dismount the test piece from between the two long clamping plates and between the two short clamping plates. The scheme can improve the loading and unloading efficiency of the hole compression test clamp.

The utility model discloses a compression test device for composite material thin-walled structure sample piece, including: clamps, anti-instability baffle and compression loading structure, the clamps are divided into two groups, are arranged at interval and are used for clamping the two side edges of the sample piece, each group of clamps comprises two support frames and two clamping plates, the two clamping plates in each group of clamps are respectively connected to the opposite sides of the two supporting frames in the group of clamps, and the opposite end surfaces of the two clamping plates in each group of clamps and the front and rear end surfaces of the corresponding side edges of the sample piece are designed in a shape following manner; the anti-instability baffles are correspondingly attached to the front portion and the rear portion of the sample piece, the two ends of each anti-instability baffle are connected with the two clamps respectively, and the compression loading structure is located over the position between the two clamps and used for applying compression loads to the sample piece. According to the compression test device, effective clamping of the sample piece can be guaranteed, instability and deformation of the sample piece in the compression process can be prevented, and the precision and reliability of a compression test are guaranteed.

The invention discloses a high-temperature SHPB (split Hopkinson pressure bar) dynamic compression test device, which is characterized in that a gas gun and a heating furnace are fixed on a rack, an incident bar and a transmission bar are arranged on two sides of the heating furnace, strain gauges are adhered to the incident bar and the transmission bar, a sample is arranged in the heating furnace, and a plurality of fasteners are divided into two groups, are fixed on the rack and are arranged on two sides of the heating furnace; the incident rod and the transmission rod are respectively fixed on each group of fasteners, the two locking blocks are respectively fixed on the incident rod and the transmission rod, the two driving pieces are connected to the rack in a sliding manner, the driving pieces can horizontally rotate, driving blocks are arranged on the driving pieces, and the two driving pieces are driven by an electric driving mechanism arranged on the rack to linearly displace. In the linear displacement process of the driving piece, the driving block abuts against the corresponding locking block to drive the incident rod and the transmission rod to linearly move towards the heating furnace, and the driving piece horizontally rotates by 180 degrees so that the incident rod and the transmission rod can linearly move away from the heating furnace. According to the invention, the problem that the test result is affected due to overlong test time caused by a manual push rod in a traditional device is solved.

The invention discloses a method for testing uniaxial compression mechanical properties of prefabricated fractured rock under the action of acid etching, which comprises the following steps: S1, preparing a sample, and taking deteriorated sandstone; s2, preparing a rock sample, namely preparing the modified sandstone into a standard cylindrical sample of phi 50 mm * 100 mm, and making a prefabricated fracture in the geometric center of the sample; s3, preparing a corrosive liquid with the pH value of 2; s4, dividing the rock samples prepared in the step S2 into two groups according to a fracture inclination angle alpha, wherein each group comprises four rock samples; wherein one group is used as a control group, is placed in air at room temperature for 48 hours and then is subjected to a uniaxial compression test; the other group of samples are immersed in the acidic solution with the pH value of 2 obtained in the step S3, four samples are obtained under each condition, and the samples are immersed for 20 d under the condition that the container is sealed; s5, performing a uniaxial compression test on a uniaxial compression testing machine; and S6, observing the rock sample damaged in the compression test by using Axia Chemi SEM to obtain the fracture development condition.

The invention discloses a filling body in-situ multi-field performance active monitoring and age-based mechanical testing device, and relates to the technical field of mine filling engineering in-situ testing and monitoring. Comprising a device body used for being immersed in underground filling slurry; the sample forming mold array is used for accommodating filling slurry in the same batch as the underground filling slurry to form a filling body sample; the multi-field environment communication structure is used for enabling the filling slurry to be in heat, water, force and chemical field communication with an external filling body; the in-situ multi-field monitoring system is used for synchronously monitoring multiple environmental parameters of the external filling body; and the age-based mechanical testing system is used for carrying out in-situ uniaxial compression tests on the filling body samples at different curing ages. According to the invention, on the premise of keeping heat-water-force-chemical communication between an underground filling body and an external filling body and establishing a pore pressure transmission condition, sample curing maintenance can be carried out, demolding can be completed in the same device without manual coring / block taking, and uniaxial compression and other mechanical data can be obtained in batches according to the age.

The invention discloses an ancient building brick masonry surface deterioration repair material and a weather resistance evaluation method thereof, and belongs to the technical field of brick masonry ancient building repair, the repair material contains three optimization systems: a lime-fly ash system (S-F), a cement mortar-fly ash system (L-F) and a calcium hydroxide-silica fume mixing system (C-S. The preparation process is simple and convenient. According to the evaluation method, the mass loss rate, the innovatively defined wave velocity degradation rate and the compressive strength are integrated, an extreme environment is simulated through a freeze-thaw cycle test, ultrasonic flaw measurement and compression test are combined, a full-dimension evaluation system is formed, and a long-term damage prediction curve is constructed through data fitting. Tests show that the cement mortar-fly ash system is optimal and meets the repair requirements. The internal damage is quantified according to the wave velocity degradation rate, a scientific basis is provided for material screening and long-term maintenance, and the method has engineering value and cultural heritage protection significance.

The invention belongs to the field of crustal stress measurement, and provides a crustal stress measurement method based on a nonlinear mechanical theory, which comprises the following steps: firstly, measuring a stress-strain curve of a strain hardening material to obtain mechanical parameters, and then constructing a measurement platform comprising a concrete cube, an elastic-plastic thick-wall cylinder and a precise range finder; the thick-wall cylinder is embedded into a concrete through hole and is internally provided with a precise range finder to monitor the change of the inner diameter. A compression test is carried out through multiple groups of horizontal pressure stresses, numerical simulation is combined, and a nonlinear model about the horizontal pressure and mechanical parameters and geometric parameters of the thick-wall cylinder is constructed by applying a Bayesian neural network and a data augmentation technology. The method comprises the following steps: placing a crustal stress observation instrument in an underground soft rock area or a fracture zone deep hole, continuously monitoring the change of the inner diameter of a thick-wall cylinder after coupling with concrete, and determining maximum and minimum principal stress and directions according to a nonlinear model; by means of the method, scientific and technical support can be provided for deep ground scientific exploration and underground engineering construction.

The invention discloses a method for synchronously characterizing mechanical properties and microscopic deformation of an explosive at a high temperature, which is suitable for synchronously characterizing mechanical properties and microscopic deformation of explosive granular mixtures, grains and other energetic material crystals or granular materials. The test process comprises the steps of sample preparation, sample installation, connection of a fatigue testing machine and a scanning electron microscope, parameter adjustment of the scanning electron microscope and the fatigue testing machine, temperature rise, temperature-mechanical-electron microscope synchronous test and the like. And a set of special compression test tool is designed, so that real-time dynamic characterization of mechanical properties and microstructure deformation under a high-temperature condition is realized. According to the method, the deformation characteristics of the explosive in the pressing process can be dynamically monitored in real time, the test process is observable, the test conditions are more scientific and reasonable, the microscopic morphology monitoring of the explosive in the deformation process is realized, the characterization accuracy is improved, and meanwhile, the method is simple to operate and has low requirements on experimenters.

The application discloses a method for obtaining in-situ interfacial mode II fracture toughness of three-dimensional woven composite material, the internal yarn weaving structure of the three-dimensional woven composite material comprises warp yarns and weft yarns, and space interlocking exists between the two kinds of yarns, the warp yarn fluctuation direction is the 1 direction of the local coordinate system of the composite material plate, the weft yarn fluctuation direction is the 2 direction, and the thickness direction is the 3 direction, and the method comprises the following steps: step 1, a small-size off-axis compression test piece is designed, and a pre-prepared crack is cut at a specified position; and step 2, a high-fidelity finite element model is established according to the structure of the test piece. The cutting position and size design of the test piece proposed in the application make the test piece have independent and simple interface structures, which is beneficial to the test of the interface mechanical properties. The notch position and length of the test piece end can ensure the stable expansion of the mode II crack along the interface of the test piece. The test piece is small in size and simple in structure, which is beneficial to the establishment of a high-fidelity full-size finite element model, and the modeling efficiency and accuracy are improved.

The invention relates to the technical field of carbon dioxide hydrate testing, and discloses a carbon dioxide hydrate sediment isotropic compression testing device and a testing method.The carbon dioxide hydrate sediment isotropic compression testing device comprises a testing assembly and a supporting seat, a filter screen is fixed to the top of the supporting seat, a control chamber is arranged above the supporting seat, and an extrusion mechanism is fixed in the control chamber; an optical fiber sensor is arranged above the supporting seat, a pipeline is arranged on the control chamber, the end part of the pipeline is connected with a filling pump, a constant temperature device is fixed on one side of the control chamber, and a pore pressure detector is arranged on the outer side of the pipeline. The device has the beneficial effects that through the arrangement of the test assembly, the limitation of a conventional geotechnical test device is broken through, the accurate control of a high-pressure and low-temperature environment is realized, the whole process of hydrate generation / decomposition under different temperature and pressure paths can be simulated, and an isotropic compression test under a multi-phase coupling condition is supported.

The utility model discloses an energizable bidirectional tension and compression mechanical testing machine chuck device, which belongs to the field of material mechanical property testing, and comprises a plurality of machine tools, the plurality of machine tools are oppositely arranged, the number of the machine tools is four, the machine tools are arranged in a cross shape, a mounting plate 102 is integrally arranged at the tail end of the upper surface of each machine tool 100, and a driving assembly 201 is mounted on the mounting plate 102. The output end of a coupler on the driving assembly is connected with a ball screw, the ball screw is slidably sleeved with a sliding table, a connecting plate is arranged at the front end of the sliding table, a mounting hole is formed in the middle of the front surface of the connecting plate, a tension sensor is fixedly inserted into the mounting hole, and the front end of the tension sensor is connected with a clamp. According to the utility model, the yield process of the material in different stress states can be more comprehensively observed by carrying out two-way tension and compression tests on the material under the electrifying condition, and a new yield criterion suitable for the complex loading condition can be established by analyzing the two-way tension and compression test data under the electrifying condition; and the prediction capability on the yield behavior of the material is improved.

The application relates to the technical field of battery materials, in particular to a paste charging material compression test device and a test method thereof, which comprises a testing machine support, a sample box mounted on the testing machine support, a compression test box and a protective gas source box, the inside of the sample box is provided with a temperature control room, and the inside of each layer of the separated rooms is provided with an automatic feeding mechanism and a heating plate. The application prevents the external environment from affecting the test results through the settings of the sample box, the temperature control room, the lifting chamber and the compression test box, reduces the influence of the temperature accuracy reduction caused by manual operation through the settings of the multiple separated rooms in the temperature control room, realizes rapid testing of multiple samples, and also facilitates the control test, so that the device has high universality, the settings of the automatic feeding mechanism, the vertical lifting support, the first electric push rod and the second electric push rod do not need manual feeding and discharging, reduce manual intervention and external influence, and further improve the accuracy of the test.

The invention provides a method for detecting the compressive strength of a solid propellant in a viscous state. The method comprises the following steps: step 1, processing the size of a sample: processing the solid propellant to be detected into a medicine column; step 2, heat preservation treatment: putting the grain prepared in the step 1 into an environmental box, and preserving heat, so that the solid propellant to be detected in the grain is in a viscous state. The grain subjected to heat preservation treatment in the second step is put into an environment box of a universal material testing machine, the temperature of the environment box is the same as the heat preservation temperature, and the compression resistance test is conducted till the compression resistance value reaches 102% or above of the qualified value required by the product. And 4, flaw detection test: sending the grain pressed in the step 3 into an industrial CT, and carrying out DR imaging scanning in the industrial CT to obtain a DR scanning picture. And 5, result judgment: observing whether damage such as cracks and gaps occurs in the DR scanning picture, if not, judging that the compressive strength of the product is qualified, otherwise, judging that the compressive strength of the product is unqualified. The method solves the problems that the compressive strength value of the solid propellant in the viscous state cannot be directly obtained through a compressive test, and then whether the product is qualified cannot be judged, and has the advantages of being visual, reliable, accurate in result and the like.

This invention provides a high-temperature compression test fixture device for composite materials suitable for DIC strain testing, belonging to the field of composite material mechanical property testing technology. The device includes a front clamping block assembly and a rear clamping block assembly, each comprising an upper clamping block and a lower clamping block, connected by a guide rod. Each upper and lower clamping block includes a main body for clamping the side of the test specimen and a lateral extension extending from one side of the main body, such that both the upper and lower clamping blocks have an L-shaped cross-section. The main bodies of the front and rear clamping block assemblies are connected by fasteners to clamp and fix the test specimen. The guide rod is disposed on the lateral extension to ensure that it does not obstruct the working area surface of the test specimen. This invention enables accurate measurement of the full-field high-temperature compressive strain of composite materials through a DIC strain testing system.

A compression test centralizing mechanism comprises a large centralizing plate, a guide plate is arranged on the right of the large centralizing plate, the guide plate is fixedly connected with the large centralizing plate through a fixing plate, two through holes are formed in the guide plate in an up-down spaced mode, a guide column is arranged in each through hole in a penetrating mode, and a plate spring is arranged on the left of the guide plate. The left end of the guide column is fixedly connected with the plate spring, a threaded hole is formed between the two through holes in the guide plate, a first screw is connected into the threaded hole in a threaded mode, the left end of the first screw makes contact with the plate spring, a small centralizing plate is arranged on the left side of the plate spring, and the upper portion and the lower portion of the right side face of the small centralizing plate are each fixedly provided with a columnar pressing block. The plate spring elastically supports the sample, the deformation of the plate spring can accommodate the deformation of the sample in the compression test process, and the sample only deforms due to compression and is not bent, so that the plate spring can adapt to the sample which is relatively thin but relatively high.

The application belongs to the technical field of strength test of single lug joint of vertical tail wall plate root of an airplane, and particularly relates to a radial compression test loading structure of a single lug joint shaft hole of a vertical tail wall plate root of an airplane, when strength test is performed by using the radial compression test loading structure, a test machine can apply a pressure load on a wall surface of a loading pressure platform, the pressure load can be transmitted to a shaft hole of a single lug joint of a single lug joint test piece through a support bushing and a loading shaft, a radial compression load is applied in the shaft hole of the single lug joint, in the process, two support bushings can support the single lug joint of the single lug joint test piece from two sides, two support plates can support a transition section of the single lug joint test piece from two sides, lateral deviation of the single lug joint test piece is prevented, and the two support bushings and the support plates can follow the loading pressure platform to follow the support, the stress environment of the single lug joint can be well ensured, and the accuracy of a test result can be ensured.