11 results about "Fracture testing" patented technology

The invention relates to a method for testing a fracture track of a metal material under a multi-field coupling effect. The method comprises the steps of sample preparation, high-temperature speckle preparation, sample loading, strain field acquisition, fracture morphology observation, data processing and fracture model establishment. By constructing a new fracture test method under the action of multi-field coupling, the problems of lack of physical field coupling factors, non-uniform test systems, limitation of fracture models and the like at present are effectively solved. A coupling loading test system capable of synchronously applying complex stress, high strain rate and transient high temperature is established, and real simulation of the multi-physical field coupling effect under the actual disaster working condition is achieved; a metal material fracture test system with universality and comparability is formed; key data support is provided for building a fracture model comprehensively considering the stress three-dimensional degree, the strain rate effect and temperature softening, the accuracy and reliability of fracture track prediction of the steel structure under the extreme disaster are remarkably improved, and an important basis is provided for engineering disaster resistance design and safety evaluation.

The utility model discloses a protective structure for a digital display type ceramic tile fracture modulus tester, and relates to the technical field of digital display type ceramic tile fracture modulus testers, the protective structure for the digital display type ceramic tile fracture modulus tester comprises a base, a protective assembly is arranged outside the base, a supporting assembly is arranged at the upper end of the base, and the protective assembly is arranged at the lower end of the base. The number of the supporting assemblies is two, a downward pressing shaft is arranged above the position between the two supporting assemblies, a downward pressing assembly is arranged above the downward pressing shaft, a display module is arranged at the upper end of the downward pressing assembly, a mounting frame is arranged between the rear end of the display module and the rear end of the base, and the protection assembly comprises an arc cover and a side protection cover. According to the scheme, the problems that an existing ceramic tile fracture modulus tester is short of protection outside, when ceramic is fractured, the ceramic is prone to splashing and hurting people, and the safety is poor are solved.

The utility model relates to the technical field of aluminum alloy bridges, in particular to an anti-fracture testing device for an aluminum alloy bridge, which overcomes the defect of lack of testing in the prior art and comprises a detection chamber, a lifter is fixedly mounted in the detection chamber, and a supporting plate is arranged at the output end of the lifter. A rack is arranged above the supporting plate, a gear is arranged in the detection chamber, the rack and the gear are mutually meshed and connected, a protective door is arranged on the right side of the gear, a first air cylinder is fixedly installed above the supporting plate, a guide rail is arranged above the supporting plate, a simulation group is arranged above the guide rail, and a second air cylinder is fixedly installed above the simulation group. A sprayer is rotatably connected to the upper portion of the simulation set, the right side of the simulation set is connected with the air rod end of a first air cylinder, a supporting frame is fixedly installed in the detection chamber, and the device has the advantages of being high in practicability and capable of achieving automatic detection.

This invention discloses a 60-80mm thick high-strength and high-toughness 980MPa steel plate, comprising the following chemical composition by mass percentage (wt%): C: 0.06-0.08, Si: 0.20-0.25, Mn: 0.60-0.70, P≤0.010, S≤0.002, Ni: 4.6-4.8, Cr: 0.5-0.6, Mo: 0.40-0.50, V: 0.05-0.06, with the remainder being Fe. After tempering and quenching treatment, its microstructure consists of tempered sorbite with a small amount of retained austenite. Its yield strength is 840–920 MPa, tensile strength is 940–1000 MPa, elongation at break is ≥16%, reduction of area is ≥50%, impact energy at -84℃ is ≥250 J, shear area ratio is ≥90%, impact energy at -100℃ is ≥200 J, shear area ratio is ≥80%. After fracture testing, the fracture surface is fibrous, without white spots, bright lines, or penetrating cracks. It exhibits excellent overall performance, fully meeting the quality requirements for high-strength and high-toughness 980 MPa steel plates.

The disclosure provides a crack analysis method, which can be applied to the technical fields of additive manufacturing and fracture mechanics. The crack analysis method comprises: determining a three-dimensional digital model of a biomimetic anti-fracture structure containing a designable hard fiber phase and a soft matrix phase feature; importing the three-dimensional digital model into the geometry preprocessing software of a material printing device for assembly to obtain a three-dimensional assembly model with the soft and hard phases adhered together; performing two-dimensional processing on the three-dimensional assembly digital model to obtain two-dimensional slice data containing the geometry of the soft and hard phases; importing the two-dimensional slice data into the material printing device for operation processing to obtain the optimal running track of the nozzle of the printing device and the type of material sprayed; layer by layer spraying and solidifying according to the optimal running track and the type of material sprayed to obtain a biomimetic anti-fracture structure sample containing a hard fiber and a soft matrix; performing a fracture test on the biomimetic anti-fracture structure sample, observing and analyzing the crack surface morphology and the fracture mode, and obtaining the observation results.

The invention relates to a method for positioning bulk materials (10, 14, 15) of a certain type in a fracture chamber (1) of a testing device (2) comprising the following successive steps: - a bulk material (10, 14, 15) of this particular type is introduced into the fracture chamber (1) of the testing device (2), wherein the fracture chamber (1) has a fracture test area (25); - at least one camera (26) checks, using a stored reference image, whether the bulk material (10, 14, 15) is arranged in the fracture test area (25) of the fracture chamber (1); - if the bulk material (10, 14, 15) is not in the fracture test area (25), the bulk material (10, 14, 15) is moved in the fracture chamber (1) by a movement mechanism (7, 4) until the bulk material (10, 14, 15) is arranged in the fracture test area (25).

This invention discloses a method for testing Type I fracture under cyclic thermodynamic loading. It couples a three-point bending test with stress-temperature cycling, extending the three-point bending test to thermodynamic experimental conditions. By measuring the peak load S in the three-point bending test and the elastic modulus E in the final stress-temperature cycle, the fracture energy Gc of the Type I fracture of the specimen under cyclic thermodynamic loading can be effectively calculated. This helps to accurately reflect the bearing capacity and fracture propagation mode of the fractured surrounding rock in compressed gas storage caverns under cyclic thermodynamic loading. The method couples stress and temperature cycles and measures the change in the elastic modulus of the specimen under cyclic stress and temperature. This method has the advantages of simple steps, quick and convenient testing, and strong practicality. It is easy to operate, has a wide range of applications, and can be combined according to different actual working conditions to meet the needs of Type I fracture testing under different specimen materials, loading temperatures, and loading conditions.

The invention relates to the technical field of rock mass drill hole deformation testing, and particularly provides a humidity-adjustable rock mass drill hole deformation and micro-fracture testing device and a humidity-adjustable rock mass drill hole deformation and micro-fracture testing method. The environment box defines a containing cavity and is used for containing a rock mass model, and the inner contour of the containing cavity and the outer contour of the rock mass model are complementary in shape; the two groups of loading assemblies respectively penetrate through the environment box, are connected to two pairs of opposite transverse side surfaces of the rock mass model and apply loads to the rock mass model, and the two groups of loading assemblies are in sealing fit with the environment box; the humidity loading assembly comprises a liquid conveying pipe and a plurality of isolation components, the rock mass model is provided with a drill hole, the environment box is provided with a through hole, the liquid conveying pipe penetrates through the through hole and is inserted into the drill hole, and all the isolation components extend into the drill hole so as to carry out partition control on the drill hole loading humidity. Through the configuration, the mechanical response of the rock mass model in a complex stress environment and the analysis of the influence of the humidity-rigidity-strain coupling effect on the rock mass model are realized.

This invention relates to an auxiliary device for a dry hot rock cold damage fracture test. The technical solution adopted by this invention is: an auxiliary device for a dry hot rock cold damage fracture test, characterized in that: it has a base plate for placement; on the base plate, via a transport mechanism, is an injection mechanism for filling the edge of the gap between two samples with epoxy resin and sealing the gap; on both sides of the base plate where the samples are placed, there are water pipe installation mechanisms for embedding water pipes into the epoxy resin between the two samples. Thus, the transport mechanism drives the injection mechanism to move uniformly around the samples on the base plate, facilitating the uniform injection of epoxy resin into the edge of the gap between the two samples; the water pipe installation mechanisms facilitate the installation of two water pipes into the epoxy resin on both sides of the samples, one water pipe serving as an inlet pipe and the other as an outlet pipe, realizing water circulation between the samples and the outside environment.

The present application provides a kind of rail fracture test method, comprising the following steps: step one: through the vibration sensor of vehicle running part axle box end, collect the vibration displacement of vehicle running part to steel rail;Step two: vibration sensor converts the collected mechanical vibration displacement into electrical signal, and is transmitted to the signal acquisition instrument of test equipment;Step three: signal processing unit is calculated and deduced to the deflection deformation of steel rail by formula through mechanics principle;Step four: the bending stiffness of the section steel rail is calculated by formula;Step five: test equipment is further calculated according to the collected deflection displacement data and bending stiffness data of steel rail The vertical vibration displacement and change rate of steel rail are calculated by formula;Step six: test equipment will automatically complete the detection, analysis and judgment of steel rail according to the obtained data;Solve the problem that user needs to manually operate and identify when testing by traditional flaw detection vehicle, without special arrangement of skylight time for testing, improve the efficiency of testing.

This invention relates to the field of hydraulic fracturing testing technology, and particularly to a fracture monitoring method, a brine hydraulic fracturing experimental apparatus, system, electronic equipment, and medium. The method includes: adjusting the concentration of the injected brine using a brine concentration control module based on a preset concentration curve, the concentration curve dynamically changing with experimental time or real-time multiphysics feedback data; during the hydraulic fracturing process of the injected brine, acquiring multiphysics data of the target fracture using a multiphysics monitoring module; and calculating the blockage state and salting-out degree of the target fracture using a multiphysics coupling analysis algorithm based on the multiphysics data. This approach solves the technical problem of existing technologies being unable to monitor the multiphysics coupling process under high temperature and high salinity conditions, improving the depth of research and the fidelity of experimental simulations regarding the fracture salting-out blockage mechanism during brine discharge from salt cavern-type compressed air energy storage.