Facility to test samples for thermal fatigue

FIELD: testing equipment.

SUBSTANCE: facility includes the power frame, mounted on the base, the passive gripper placed on it, the alternating loading device, the test sample electric heating device, the temperature control and monitoring unit, and the thermal loading record facility. The loading device is made in the form of the body with the piezoelement package, installed in it and the working element, made in the form of the disc, the central part of which is the active gripper coaxial to the passive gripper, the peripheral part of the disc is provided with the inertial mass uniformly distributed along the disc circumference, and the middle part is rigidly connected to the body. The facility is equipped with the additional loading device with the axial loading, made in the form of the tubular electric heater with the pipeline, intended for supplying the cooling medium, the mobile traverse, mounted on the frame with the possibility of axial movement and fixation relative to the latter, and the platform, placed on the mobile traverse and equipped with the thermal load record facility. One end of the electric heater is fixed to the base. The mobile traverse is connected to the other end of the electric heater. The body of the alternating loading device is fixed on the platform, and the thermal load record facilities are made in the form of at least three strain-gauge rods.

EFFECT: possibility to adjust the thermomechanical cycle asymmetry, when changing the loading frequency.

2 dwg

 



 

Same patents:

FIELD: test equipment.

SUBSTANCE: device includes gas generator and operation part with structural material sample, connected in series. Gas generator features removable mixing head. Cylindrical combustion chamber of the gas generator features ignition device and orifice plate. Operation part includes interconnected clamping flange with central hole and flange holding a sample. Central longitudinal axes of flange and sample are coincident. Internal cylindrical surface of clamping flange forms an annular slot with the sample surface, the slot joins a cavity ending with output nozzle through end outlet holes in the flange around sample.

EFFECT: possible maintenance of required pressure-heat loading modes for samples, modelling natural thermal stress state of structural materials of various aggregates operating in alternate heat modes.

1 dwg

FIELD: testing equipment.

SUBSTANCE: invention relates to testing equipment, to tests of mostly samples of rocks. The bench comprises a base, sample grips installed on it coaxially, a device to load a sample with an axial mechanical load, a mechanism for interaction with the sample, a platform for movement of the mechanism along the axis of the grips, a platform for movement of the mechanism in the vertical direction perpendicularly to the axis of the grips and a platform for movement of the mechanism in the horizontal direction perpendicularly to the axis of the grips. The mechanism for interaction with the sample is made as milling.

EFFECT: expansion of functional capabilities of a bench by provision of research with gradual removal of material sample without removal of mechanical load.

1 dwg

FIELD: test equipment.

SUBSTANCE: stand includes base, coaxial sample grips mounted on the base, sample loading device connected to the grips, mechanical sample processing device and platform for processing devise movement against grip axes. Additionally the stand features aggregate for grip turning around grip axis, consisting of drive with two gear wheels bearing the grips, on the drive shaft.

EFFECT: extended functionality of stand due to test performance at changing directions of mechanical processing against radial directions of sample.

1 dwg

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

FIELD: transport.

SUBSTANCE: invention relates to space hardware testing, namely to installations for simulation of spacecraft components operation modes. Installation for vacuum thermocycling of photoconverter panels includes vacuum chamber consisting of two communicating compartments. In one compartment, two cryopanels are installed in parallel with possibility to place tested panel between them. In the second compartment there is thermal panel made as assembly of filament lamps. The cryopanels and thermal panel are positioned vertically, and thermal panel compartment is placed over cryopanel compartment. The cryopanels are installed with possibility of additional placement of thermal panel between them. The thermal panel is provided with reciprocating mechanism of vertical action and thermal insulation at the side facing cryopanel.

EFFECT: higher accuracy of thermal simulation of outer space conditions.

3 cl, 4 dwg

FIELD: physics.

SUBSTANCE: device has a cylindrical housing, a horizontal partition wall and sensors for monitoring and controlling tests. Inside the cylindrical housing, which has a flat bottom and an air-tight cover which is fixed by bolts and nuts in the top part, there is a drum which is mounted on the cover inside the housing. The horizontal partition wall is placed in the bottom part of the drum and is in form of a perforated disc whose perforations are in form of calibrated orifices lying on a circle, having along their edge calibrated channels for passage of heating medium. Inside the drum there is an additional horizontal partition wall with calibrated orifices which are exactly as those in the perforated disc. Sample pipes are fitted in the perforations of the disc and are fixed on the cover of the housing, and there are vertical partition walls between the pipes. Pipes with a smaller diameter are fitted inside each sample pipe and are fixed in a dispensing receiver and have in their top part connecting pipes for outlet of cooling medium and discharge pipes with calibrated devices on them. In the bottom part of the housing under the perforated disc there is a pipe with a diffusion nozzle connected to a cylindrical diffuser and a connecting pipe for inlet of heating medium and a system of chambers with a connecting pipe at the bottom for outlet of the heating medium.

EFFECT: high quality and accuracy of tests and efficiency thereof.

3 dwg

FIELD: physics.

SUBSTANCE: method of determining heat resistance of bentonite clay is characterised by that, a nomograph which reflects dependency of temperature of the second endothermal effect and heat resistance of bentonite clay from contained structural iron is constructed first. For this purpose samples of bentonite clay from known deposits are analysed. The samples are tested in a derivatograph. Derivatograms with differential thermo-weighted (DTW) and differential thermal (DT) curves are obtained, from which temperature of the second endothermal effect is determined depending on structural iron contained in the samples. Heat resistance of the samples is determined depending on structural iron contained in the samples. From the said two curves, the said nomogram is constructed, which is then used for subsequent determination of heat resistance of the analysed bentonite clay; a wet ground up sample is tested in a derivatograph by heating followed by drying. Derivatograms with differential thermo-weighted and differential thermal curves are obtained, from which temperature of the second endothermal effect is determined and heat resistance of the analysed bentonite clay is determined from the said nomogram.

EFFECT: cutting on time and simplification of the process of determining heat resistance.

2 dwg

FIELD: physics.

SUBSTANCE: stone sample saturated with water is frozen to a specified temperature. The sample is unfrozen and deformation is measured. Before freezing, the threshold load which accounts for long-term compression strength of the sample is measured using a nondestructive method. After several thermal cycles, residual deformation of the unfrozen sample is measured in the direction perpendicular the previous compression. A least residual deformation is achieved through periodical compression of the sample in the current direction from zero to a load which exceeds the threshold by not more than a third. The number of thermal cycles required for reducing long-term strength to the required value is determined by repeating these operations.

EFFECT: reduced labour input and increased efficiency.

1 tbl

FIELD: measuring technique.

SUBSTANCE: method comprises heating the heat-shield structure from one side up to a high temperature, cooling the structure, applying marker dots on the section of the outer surface under study, cutting the axisymmetric specimens of the heat-shield structure, applying marker dots on the side of the specimen at a given distance from the inner surface, cutting the specimen over the planes perpendicular to its longitudinal axis and passing through the marker dots into pieces, subsequent heating of the pieces in the atmosphere of an inert gas, recording the change of weight of the pieces, recording the temperature of the beginning of the decrease of weight of each piece, and judging on the spatial temperature distribution from data obtained.

EFFECT: expanded functional capabilities.

5 dwg

FIELD: testing engineering.

SUBSTANCE: device comprises high-frequency generator and inductor connected in series, device for control of heating, system for air supply, device for external cooling, measuring system, unit of contact temperature gauges, and device for bottom clamping connected with the end section of the blade. The device is provided with a means for axial loading, device for top clamping connected with the shelf of the end section of the blade, device for control of axial loading, first dynamometer, device for applying torque, which has the second dynamometer, device for information input, load-bearing frame, contactless temperature gauge, generator of nonstandard signals, oil pumping system, and device for internal cooling.

EFFECT: enhanced reliability of testing.

7 cl, 1 dwg

FIELD: testing engineering.

SUBSTANCE: device comprises high-frequency generator and inductor connected in series, device for control of heating, system for air supply, device for external cooling, measuring system, unit of contact temperature gauges, and device for bottom clamping connected with the end section of the blade. The device is provided with a means for axial loading, device for top clamping connected with the shelf of the end section of the blade, device for control of axial loading, first dynamometer, device for applying torque, which has the second dynamometer, device for information input, load-bearing frame, contactless temperature gauge, generator of nonstandard signals, oil pumping system, and device for internal cooling.

EFFECT: enhanced reliability of testing.

7 cl, 1 dwg

FIELD: measuring technique.

SUBSTANCE: method comprises heating the heat-shield structure from one side up to a high temperature, cooling the structure, applying marker dots on the section of the outer surface under study, cutting the axisymmetric specimens of the heat-shield structure, applying marker dots on the side of the specimen at a given distance from the inner surface, cutting the specimen over the planes perpendicular to its longitudinal axis and passing through the marker dots into pieces, subsequent heating of the pieces in the atmosphere of an inert gas, recording the change of weight of the pieces, recording the temperature of the beginning of the decrease of weight of each piece, and judging on the spatial temperature distribution from data obtained.

EFFECT: expanded functional capabilities.

5 dwg

FIELD: physics.

SUBSTANCE: stone sample saturated with water is frozen to a specified temperature. The sample is unfrozen and deformation is measured. Before freezing, the threshold load which accounts for long-term compression strength of the sample is measured using a nondestructive method. After several thermal cycles, residual deformation of the unfrozen sample is measured in the direction perpendicular the previous compression. A least residual deformation is achieved through periodical compression of the sample in the current direction from zero to a load which exceeds the threshold by not more than a third. The number of thermal cycles required for reducing long-term strength to the required value is determined by repeating these operations.

EFFECT: reduced labour input and increased efficiency.

1 tbl

FIELD: physics.

SUBSTANCE: method of determining heat resistance of bentonite clay is characterised by that, a nomograph which reflects dependency of temperature of the second endothermal effect and heat resistance of bentonite clay from contained structural iron is constructed first. For this purpose samples of bentonite clay from known deposits are analysed. The samples are tested in a derivatograph. Derivatograms with differential thermo-weighted (DTW) and differential thermal (DT) curves are obtained, from which temperature of the second endothermal effect is determined depending on structural iron contained in the samples. Heat resistance of the samples is determined depending on structural iron contained in the samples. From the said two curves, the said nomogram is constructed, which is then used for subsequent determination of heat resistance of the analysed bentonite clay; a wet ground up sample is tested in a derivatograph by heating followed by drying. Derivatograms with differential thermo-weighted and differential thermal curves are obtained, from which temperature of the second endothermal effect is determined and heat resistance of the analysed bentonite clay is determined from the said nomogram.

EFFECT: cutting on time and simplification of the process of determining heat resistance.

2 dwg

FIELD: physics.

SUBSTANCE: device has a cylindrical housing, a horizontal partition wall and sensors for monitoring and controlling tests. Inside the cylindrical housing, which has a flat bottom and an air-tight cover which is fixed by bolts and nuts in the top part, there is a drum which is mounted on the cover inside the housing. The horizontal partition wall is placed in the bottom part of the drum and is in form of a perforated disc whose perforations are in form of calibrated orifices lying on a circle, having along their edge calibrated channels for passage of heating medium. Inside the drum there is an additional horizontal partition wall with calibrated orifices which are exactly as those in the perforated disc. Sample pipes are fitted in the perforations of the disc and are fixed on the cover of the housing, and there are vertical partition walls between the pipes. Pipes with a smaller diameter are fitted inside each sample pipe and are fixed in a dispensing receiver and have in their top part connecting pipes for outlet of cooling medium and discharge pipes with calibrated devices on them. In the bottom part of the housing under the perforated disc there is a pipe with a diffusion nozzle connected to a cylindrical diffuser and a connecting pipe for inlet of heating medium and a system of chambers with a connecting pipe at the bottom for outlet of the heating medium.

EFFECT: high quality and accuracy of tests and efficiency thereof.

3 dwg

FIELD: transport.

SUBSTANCE: invention relates to space hardware testing, namely to installations for simulation of spacecraft components operation modes. Installation for vacuum thermocycling of photoconverter panels includes vacuum chamber consisting of two communicating compartments. In one compartment, two cryopanels are installed in parallel with possibility to place tested panel between them. In the second compartment there is thermal panel made as assembly of filament lamps. The cryopanels and thermal panel are positioned vertically, and thermal panel compartment is placed over cryopanel compartment. The cryopanels are installed with possibility of additional placement of thermal panel between them. The thermal panel is provided with reciprocating mechanism of vertical action and thermal insulation at the side facing cryopanel.

EFFECT: higher accuracy of thermal simulation of outer space conditions.

3 cl, 4 dwg

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

FIELD: test equipment.

SUBSTANCE: stand includes base, coaxial sample grips mounted on the base, sample loading device connected to the grips, mechanical sample processing device and platform for processing devise movement against grip axes. Additionally the stand features aggregate for grip turning around grip axis, consisting of drive with two gear wheels bearing the grips, on the drive shaft.

EFFECT: extended functionality of stand due to test performance at changing directions of mechanical processing against radial directions of sample.

1 dwg

FIELD: testing equipment.

SUBSTANCE: invention relates to testing equipment, to tests of mostly samples of rocks. The bench comprises a base, sample grips installed on it coaxially, a device to load a sample with an axial mechanical load, a mechanism for interaction with the sample, a platform for movement of the mechanism along the axis of the grips, a platform for movement of the mechanism in the vertical direction perpendicularly to the axis of the grips and a platform for movement of the mechanism in the horizontal direction perpendicularly to the axis of the grips. The mechanism for interaction with the sample is made as milling.

EFFECT: expansion of functional capabilities of a bench by provision of research with gradual removal of material sample without removal of mechanical load.

1 dwg

FIELD: test equipment.

SUBSTANCE: device includes gas generator and operation part with structural material sample, connected in series. Gas generator features removable mixing head. Cylindrical combustion chamber of the gas generator features ignition device and orifice plate. Operation part includes interconnected clamping flange with central hole and flange holding a sample. Central longitudinal axes of flange and sample are coincident. Internal cylindrical surface of clamping flange forms an annular slot with the sample surface, the slot joins a cavity ending with output nozzle through end outlet holes in the flange around sample.

EFFECT: possible maintenance of required pressure-heat loading modes for samples, modelling natural thermal stress state of structural materials of various aggregates operating in alternate heat modes.

1 dwg

Up!