SU1536258A1 - Installation for fatigue testing of specimen in circular bend - Google Patents

Abstract

This invention relates to a testing technique. The purpose of the invention is to expand the functionality by providing modes of both long-term loading and dynamic loading of the sample with a given amount of energy. The installation includes a housing with crossbars 3, 4, grips 5, 6 for sample 7 and a loader including a rotation drive 8, placed on its shaft 9 platform 13 in the form of a disk, cross member 10 with wheels 12 fixed on it and inertial weights 17, clamp 14 rotation of the platform, the latch 18 of rotation of the cross member and electromagnetic clutches 15, 16 for connection with the shaft 9, respectively, of the platform and the cross member. For dynamic loading of the sample at a fixed position, the cross member 10 rotates platform 13 and unwinds the loads 17. When the platform is braked with latch 14, wheels 12 round the platform along with the cross member due to the rotation of the loads, which leads to a high-speed deformation of the sample. When the platform and cross member rotate together, the deformation is performed in a static mode. 1 il.

Description

(57) The invention relates to test equipment. The purpose of the invention is the expansion of functionality by providing modes of both long-term loading and dynamic loading of the sample with a given amount of energy. Installation contains

4, captures of the wheels 12 and inertia 17, the latch 14 rotational fixator 18 of rotation of the electromagnetic coupling case with crossbars 3.

5, 6 for specimen 7 and a loader, including a rotation drive 8, a platform 13 in the form of a disk, a cross-beam 10 mounted on it with a single load of the platform, cross-beam, mounted on its shaft 9. and you are 15, 16 for connecting with the shaft 9, respectively, of the platform and the cross-section. For dynamic loading of the specimen with the fixed position of the cross-member 10, the platform 13 is rotated and the weights 17 are untwisted. When the platform is braked by the lock 14, the wheels 12 run around the platform together with the cross-member due to the rotation of the load, which leads to high-speed deformation of the sample. When the platform and the cross member rotate together, the deformation is performed in the static mode. 1 ill.

---- About SS

Nzobre.hmme relates to testing equipment, and in particular to installations for testing flexible samples of materials and fatigue under circular bending .- '' ’

The purpose of the invention is the expansion of functional capabilities by providing modes of both long-term loading and dynamic loading shaped like a given amount of energy.

But here is an installation, a drawing scheme, | The installation comprises a housing in the form of a frame with uprights 1 and 2 and a crossbar. 3 and 4, grips 5 and 6 for the sample: 7 and a loader, including drive 8 ^; Artssta’s located on its shaft 9: cross 10 with semiaxes 11, mounted on the same distance jq from the axis of the shaft and mounted on them with 12 wheels, platform 13, made in the form of a disk located in it with wheels 12, locking pin 14 for rotation of the platform 13, clutch 15, joint 25 of the platform division with the drive shaft 9 and! couplings 16 connecting the cross member 10 to the shaft. 9, inertial loads 17 ,. mounted on the half shafts 11 and connected with the wheels 12, and the clamps 18 opposite the rotation of the cross member 10.

: The crossbar 3 is mounted on the stable 1 and 2 with the possibility of movement by means of screws 19, made with a longitudinal guide groove 20, in. to the top there is a gripper 5 with the possibility of movement by means of a screw 211 The crossbar 4 is made with a central hole 22, through which the drive shaft 9 passes.

The grip 6 is fixed on the cross member with an eccentricity relative to the axis of its rotation, adjustable screw 23,

All clamps and couplings are electromagnetic.

Installation works as follows,

By rotating the screws 21 and 23, the grips 5 and b are set relative to the axis of the shaft 9 in accordance with the specified asymmetry of the deformation cycle. By rotation of the screws 19, the crossbar 3 is shifted from one to the other. As a result, the posts are 4 and ππν: Κ: 'Ηΐ ··' ΐ sample 7 axial loading

- behind in the hell out of tina.

For the dynamic loading of the sample with a given volume of energy, rotation locks 18 are included on the cross member Yu and mult о. so e. · and lire нп тм члт Form 13 with a shaft 9. Turn on the drive 8. When the shaft 9 is rotated, the coupling 15, by interacting with the lock body 14, rigidly connected to the platform 13. rotates the platform and untwists the loads 17 through the wheels 12 located on non-rotating crossbar 10. Upon reaching a predetermined speed of rotation of the goods 17, determined by a given amount of supplied energy, disconnect the clutch 15 and the latches 18, and include a latch 14, which rigidly connects the platform 13 with the crossbar 4. As a result of the wheel 12 under the action of the energy of rotation of the goods 17 they run around the platform 13 and rotate the cross-bar 10 with the gripper 6. A circular bending of the sample 7 takes place until the energy of the system accumulated on untwisted inertial loads is fully realized.

To ensure long circular bending of the sample, the clutch 15 connects the platform to the shaft 9 and the clutch 16 connects the cross member 10 to the shaft 9. When the drive 8 is turned on, the platform 13 and the other 10 jointly rotate at a constant speed. set by the drive 8.

After reaching the specified number of loading cycles, in the static mode · repeat the operation of dynamic loading of the sample. In the course of the experiment, it changes the magnitude of the axial load, and between the modes, the asymmetry of the cycles of defor m and r o in a ι si.

Claims (1)

Claim Installation for testing the sample · for fatigue during circular bending, comprising a housing with two parallel rungs, in the first of which a longitudinal guide groove is made. ·· in. the second - a perpendicular to the crossbeams - a through hole, two grippers for the sample., the first of which is mounted in the guide groove with the possibility of movement, a mechanism for axial loading of the sample and a pivotally connected to the second gripper loader, including a shaft located in the hole of the high-end crossbar, a mounted cross member, a rotary drive and a platform connected to the hall and a wheel placed on the cross member and designed for interacting with the platform, characterized in that, for the purpose of expansion, the functional possibilities by providing modes of both long loading and dynamic loading of the sample with a given amount of energy, it is equipped with a mechanism for moving the second capture relative to the first capture, additional wheels associated with corresponding wheels with inertial loads, rotation locks of the cross member and platform, respectively, and couplings for connecting with the shaft of the platform and the cross member respectively, the platform is made in the form of a disk, the wheels are mounted in the same plane of rotation with the ed platform, and in The second grip is mounted on the cross member.