RU2624407C1 - Stand for exploring energy exchange at fracture - Google Patents

Abstract

FIELD: test equipment.

SUBSTANCE: stand contains a body, sample grippers mounted on it, a loading mechanism including two flexible rods kinematically connected to the grippers, a traction mechanism of the rods, a platform, a rotation drive mounted on the platform, a load oscillator in the form of a triangle mounted on the drive shaft of the rotation drive and located between the rods, and a drive for moving the platform along the axis of the shaft. The stand is provided with a rotation platform with a rotation lock, the axis of rotation of which is perpendicular to the axis of the shaft, and a releasable connection of the rotation drive shaft with the exciter of the load oscillations. The second ends of the rods are fixed on the surface of the rotation platform with the possibility of changing the fixing points.

EFFECT: expanding the functionality of the stand with a proportional change in the amplitudes of alternating cycles and intervals between the cycles.

1 dwg

Description

The invention relates to testing equipment, to strength tests.

A known installation for testing samples for fatigue (RF patent No. 2049325, publ. 11/27/1995), comprising a housing, grips for the sample mounted on it, a loading mechanism including traction kinematically connected with grippers, a rotation drive, a load vibration pathogen, installed on a rotation drive shaft, and a tensioning mechanism.

The disadvantage of the installation is that it does not provide testing during transitions from cyclic loads with smooth regulation of the amplitude of the cycles to constant long-acting or stepwise variable loads, as well as to gradually changing loads during arbitrary alternation of types of loading during tests without unloading the sample at proportional changing the amplitudes of alternating cycles and intervals between cycles.

A known installation for testing samples for fatigue (patent RU No. 2455626, published on July 10, 2012), comprising a housing, sample grips mounted on it, a loading mechanism, including two flexible rods kinematically connected with grippers, a tension tension mechanism, a platform, a rotation drive mounted on the platform, a load vibration exciter located between the rods.

The disadvantage of the installation is that it does not provide testing during transitions from cyclic loads with smooth regulation of the amplitude of the cycles to constant long-acting or stepwise variable loads, as well as to gradually changing loads during arbitrary alternation of types of loading during tests without unloading the sample at proportional changing the amplitudes of alternating cycles and intervals between cycles.

A well-known stand for the study of energy transfer during destruction (RF patent No. 2505794, publ. 01/27/2014), adopted as a prototype, the stand contains a housing mounted on it grips the sample, the loading mechanism, including two flexible rods, kinematically connected with grippers, tension a link mechanism, a platform, a rotation drive mounted on the platform, a triangle-shaped load vibration exciter mounted on the rotation drive shaft and located between the rods, and a platform movement drive along the shaft axis. The bench provides testing during transitions from cyclic loads with smooth regulation of the amplitude of cycles to constant long-acting or stepwise variable loads, as well as to gradually changing loads during arbitrary alternation of types of loading during testing without unloading the sample, which brings it closer to the proposed functionality.

The disadvantage of the stand is that it does not allow testing with a proportional change in the amplitudes of alternating cycles and intervals between cycles.

The technical result is to expand the functionality of the stand by providing tests with a proportional change in the amplitudes of alternating cycles and intervals between cycles.

The test bench for energy exchange during destruction is illustrated in FIG. 1 - the general scheme of the stand, where

1 - housing;

2, 3 - captures;

4 - sample;

5, 6 - flexible traction;

7 - tension mechanism of rods;

8 - platform;

9 - rotation drive;

10 - pathogen;

11 - shaft;

12 - drive moving the platform.

The test bench for energy exchange during destruction includes a housing 1, grips 2, 3 of sample 4 installed on it, a loading mechanism including two flexible rods 5, 6 kinematically connected with grippers, a tension mechanism 7 of rods, a platform 8, a rotation drive 9 mounted on platform 8, the pathogen 10 load fluctuations in the form of a triangle ABC mounted on the shaft 11 of the rotation drive 9 and located between the rods 5, 6, and the drive 12 moving the platform along the axis O-O of the shaft 11.

The stand is equipped with a rotation platform 13 with a drive 14 and a rotation lock 15, the axis of rotation CC of which is perpendicular to the axis O-O of the shaft, and a detachable connection 16 of the shaft 11 of the rotation drive with the exciter 10 of the load fluctuations. The second ends of the rods 5, 6 are fixed on the surface of the platform 13 of rotation with the possibility of changing the fixing points.

The linkage of the rods 5, 6 with the grippers 2, 3 is carried out through the lever 17. The tension is regulated using the spring 18. Changing the attachment points of the rods 5, 6 on the surface of the platform 13 can be carried out, for example, using hooks 19 mounted on the surface of the platform 13. Line ar denotes the height of the triangle abv .

The stand works as follows.

The rotation drive 9 is turned on and the load exciter 10 is rotated around the axis O-O of the shaft 11 by means of the shaft 11. The pathogen 11 interacts with the rods 5, 6 and through the spring 18, the lever 17 and the grippers 2, 3 transfers the cyclic load to the sample 4. Cycle parameters and load levels depend on the stand assembly option. In the assembly embodiment shown in FIG. 1, when the plane of arrangement of the rods 5, 6 is close to the plane of the drawing, and one of the sides ab of the triangle is parallel to the axis O-O of the shaft 11, the work of the stand will take place according to the following scheme. When turning, the pathogen 10 with side AB alternately interacts with rods 5 and 6, deflects them, and through the spring 18 loads the sample with 4 cycles with different amplitudes: small amplitude when interacting with rod 5 and larger when interacting with rod 6. Cycles are created alternately without intervals between them. For tests with a proportional change in the amplitude of the cycles and the time intervals between cycles, the latch 15 is turned off and the platform 14 is rotated by the platform 13 so that the plane of the rods 5, 6 is rotated about the O-O axis, approaching a position perpendicular to the plane of the drawing. The interval between the cycles is the larger, and the difference in the magnitudes of the amplitudes is the smaller the greater the angle of rotation of the platform 13. The interval between cycles is maximum, and the amplitudes are equal when the plane of arrangement of the rods becomes perpendicular to the plane of the drawing. Upon reaching the specified parameters, the platform 13 is fixed with a latch 15. For loads with the same or smoothly changing cycles without time intervals between cycles, the ends of the rods are fixed in the center of the platform 13 on the CC axis, and the pathogen 10 is set to the position where the height ag ABV triangle coincides with the axis O-O of the shaft 11 (prototype assembly option). With all assembly options, for a proportional change in the amplitudes of the cycles, the drive 12 moves the platform 8 with the rotation drive 9, the shaft 11 and the pathogen 10 relative to the CC axis and rods 5, 6. To change the initial load level with the drive 7, move the platform 13 and change the spring tension 18 .

The stand provides testing in new modes - with a proportional change in the amplitudes of alternating cycles and intervals between cycles, which, along with tests during the transition from cyclic loads with smooth regulation of the amplitude of the cycles to constant long-acting or step-by-step loads, as well as gradually changing loads at arbitrary alternating types of loading during testing without unloading the sample significantly expands the functionality of the stands.

Claims (1)

A bench for studying energy transfer during destruction, comprising a housing, sample grips installed on it, a loading mechanism including two flexible rods kinematically connected with grippers, a rod tension mechanism, a platform, a rotation drive mounted on the platform, a load vibration exciter in the form of a triangle mounted on the shaft of the rotation drive and located between the rods, and the platform moving drive along the shaft axis, characterized in that it is equipped with a rotation platform with a rotation lock, the rotation axis of which perpendicular to the axis of the shaft, and releasable connection with the drive shaft pathogen load fluctuations, while the second ends of rods are fixed to the rotation surface of the platform with adjustable fastening points.

Images