Device to test samples for crack formation

FIELD: testing equipment.

SUBSTANCE: device comprises a body with a flange joint and tested samples in the form of tubes. Tested samples in the amount of two arranged coaxially one inside the other to form a circular gap between them, are fixed inside separate parts of the body, placed on a header of hot water and a header of drainage of a mixture of hot and cold water. Headers by means of pipelines are connected to a heater and a refrigerator. The outer surface of the outer tube and the inner surface of the central tube are coated with a layer of insulation. In the upper part of the body there is a nozzle and a valve for supply and control of cooling water flow.

EFFECT: elimination of medium working pressure impact at process of crack formation, providing for pure crack formation only due to pulsation of medium temperature, which results in getting absolutely accurate testing results.

1 dwg

 

The invention relates to the field of energy, to devices for the study of thermosflasche samples, are subject to occasional temperature pulsations in the fluid flow, and can be used in the nuclear industry and in the transport and energy devices.

A known device for investigation of thermal fatigue pipes, reproducing in the testing conditions, the destruction of water pipes as a result of changing conditions of heat transfer on the inside of the pipe containing a closed pipe circuit in the form of a triangle, one of the tops facing down and mounted on a shaft filled to a certain level of distillate. On one side of the circuit includes the electric furnace. When the oscillation circuit, the water level in it is moved, thereby the fluctuation of temperature of the pipe wall (Trojan E.A., Karikoski I.K. Thermal fatigue of the pipe at high pressure. The collection: a Study of the safety elements of steam boilers, mA'am, M., 1954, p.45-52, and Trojan E.A. Metals boiler and strength of parts of steam boilers. Energy, M - L.. 1964, p.192).

The disadvantages of the known installation is the complexity of manufacturing of each sample - closed pipe circuit in the form of a triangle, the installation of the electric furnace to the sample, the difficulty in determining the location for testing, as well as a large period of one which of Tcl and as a consequence, a lot of time to obtain a large number of cycles (106-107to build the fatigue curve, in addition, the failure to raise the temperature difference and repetition test conditions due to the individual production of each plot.

Known device for testing a sample for thermostast, containing a hollow cylindrical housing filled with fluid, a partition with a hole provided in the casing and dividing it into two cavities with different temperatures of the coolant, the heater and the cooler coolant, and the heater and the cooler is installed in the housing on opposite sides of the partition, the partition is made in the form of fixed coaxially to the drive enclosure with a recess for accommodating the end of the sample, and the axis of the recess parallel to the axis of the disc and the edge of the recess is located from the axis of the hole at a distance equal to the radius of the holes (SU 1665284, IPC: G01N 3/60, published 23.07.91)

A disadvantage of the known device is the complexity of manufacturing, as well as the influence of the value of the operating pressure on the fracturing process, which leads to the violation of the purity of the experiment.

A device for testing of samples for thermostast, comprising a cylindrical casing, a horizontal division wall and sensors to the control and management of trials, within the cylindrical body, provided with a flat bottom and sealed at the top, secured by studs and nuts, is a drum mounted on the lid inside the housing, a horizontal partition located in the lower part of the drum and is made in the form of a perforated disk, a perforation is made in the form of spaced around the circumference of the calibrated holes having along its generatrix calibrated channels for passage of a heating medium into the internal cavity of the drum set additional horizontal partition with calibrated holes in it, exactly the same as the holes in the perforated disc, tube samples are installed in the holes the perforated disk and secured to the cover, and between the tubes installed vertical partition walls, into the internal cavity of each tube sample wound tube of smaller diameter, fixed in the handout receiver and having in its upper part fittings for drainage of the cooling medium and the drain pipe with calibrated devices on them, in addition, in the lower part of the body under a perforated disk mounted tube with diffuser nozzle connected with a cylindrical diffuser and a nozzle for supplying a heating medium and system cameras with a fitting on the days of the e for removal of the heating medium. (EN 2433385 IPC G01N 3/60, published on 10.11.2011).

On the totality of symptoms is known technical solution is the closest to the claimed and adopted for the prototype.

A disadvantage of the known technical solutions, as well as a cause of hindering the achievement of the desired technical result when using the known devices is the complexity of manufacturing and adjusting the load in parallel samples.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources, and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant is not found technical solutions, characterized by signs that are identical or equivalent to offer. While the proposed solution is not derived explicitly for the specialist by way of the known prior art and defined by the applicant.

The definition from the list of identified unique prototype as the closest technical solution set of the features revealed in the inventive device the essential distinguishing features in relation to perceived by the applicant to the technical result set forth in the following claims.

Savla is my solution allows you to experience cracking at the same time a large number of samples, conduct fatigue tests to obtain curves of metal fatigue by creating on the surface of the images in an organized leakage of hot and cold environment unstable temperature regime with sharp fluctuations of temperature at various frequencies and amplitudes. The location of samples in the internal cavity of the housing eliminates the influence of working pressure on the formation of cracks, providing pure crack growth only due to the ripple temperature environment, resulting in an absolutely accurate test results.

The proposed device for testing of samples for crack growth, including housing with flange connector and the samples in the form of tubes, while the samples in two, arranged coaxially one within the other with the formation of the annular gap between them, secured inside some parts of the body, placed on the collector supply of hot water and the exhaust manifold of the mixture of hot and cold water, the reservoir through pipes connected to the heater and fridge, and the outer surface of the outer tube and the inner surface of the Central tube covered with a layer of insulation, in addition, in the upper part of the housing has a fitting and valve for supplying and controlling the flow cooling water. To the collector of the m can be attached necessary for the experiment, the number of buildings with participant samples.

The invention is illustrated in the drawing.

Device for testing of samples for fracturing comprises a housing 1 with flange connector 2 and the samples in the form of tubes 3, 4. The samples in two, arranged coaxially one within the other with the formation of the annular gap between them secured inside some parts of the body 1 placed on the collector supply of hot water 5 and the collector drainage mixture of hot and cold water 6. Collectors 5, 6 through line 7 is connected to the heater 8 and the fridge 9. The outer surface of the outer tube 4 and the inner surface of the Central tube 3 is covered with the insulation layer. In the upper part of the housing 1 has a nozzle 10 and a valve for supplying and controlling the flow of cooling water 11. To collectors 5 and 6 can be attached necessary for the experiment, number of buildings 1 with participant samples 3 and 4.

The device operates as follows. Hot water from the heater 8 through the reservoir 5 is supplied to each of the housing 1 and through the Central tube of the sample 3, mixed with cold water flowing through the nozzle 10 from the refrigerator 9 enters the annular gap formed between the subjects samples 3 and 4, causing the fracturing process. Valve 11 is provided desired flow of the mixture in the gap, through which the collective is a PR 6 is given in the device map. Tubular samples 4 from the outer surface and 3 with the inner surface covered with the insulating layer, which provides more intensive ripple temperature in the annular gap.

The location of samples 3 and 4 in the inner cavity of the housing 1 is not influenced by the operating pressure of the environment in the process of cracking, providing pure crack growth only due to the ripple temperature environment.

Temperature fluctuations in the environment, affecting the surface of the pipe sample and causes the deformation of their surface, are recorded by sensors and control tests (pressure sensors, strain gauges and thermocouples is not shown in the figure). Based on these measurements, calculate the voltage corresponding to the deformations of the tube samples, and in accordance with the number of test cycles, build curves of fatigue.

Device for testing of samples for crack growth, including housing with flange connector and the samples in the form of tubes, wherein the samples in two, arranged coaxially one within the other with the formation of the annular gap between them, secured inside some parts of the body, placed on the collector supply of hot water and the exhaust manifold of the mixture of hot and cold water, sewers through the Tr is aprovado connected to the heater and fridge, thus the outer surface of the outer tube and the inner surface of the Central tube covered with a layer of insulation, in addition, in the upper part of the housing has a fitting and valve for supplying and controlling the flow of cooling water.



 

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